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WO1999054993A1 - Amplifier - Google Patents

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Publication number
WO1999054993A1
WO1999054993A1 PCT/CN1998/000063 CN9800063W WO9954993A1 WO 1999054993 A1 WO1999054993 A1 WO 1999054993A1 CN 9800063 W CN9800063 W CN 9800063W WO 9954993 A1 WO9954993 A1 WO 9954993A1
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WIPO (PCT)
Prior art keywords
amplifier
output
stage
transformer
input
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Ceased
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PCT/CN1998/000063
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French (fr)
Chinese (zh)
Inventor
Shaofu Li
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Individual
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Individual
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Priority to AU69173/98A priority Critical patent/AU6917398A/en
Priority to PCT/CN1998/000063 priority patent/WO1999054993A1/en
Publication of WO1999054993A1 publication Critical patent/WO1999054993A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/30—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor
    • H03F3/3001—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor with field-effect transistors
    • H03F3/3061—Bridge type, i.e. two complementary controlled SEPP output stages
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
    • H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
    • H03F3/185—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only with field-effect devices

Definitions

  • the present invention relates to an amplifier, and more particularly, to an amplifier composed of a coupled boost transformer and a symmetrical source complementary source follower.
  • An object of the present invention is to provide an amplifier that can greatly simplify a circuit, reduce manufacturing costs, and has perfect sound quality and excellent electrical performance.
  • the amplifier according to the present invention comprises: as input stage and output stage of the amplifier, two symmetrical power source complementary source followers using a depletion type field effect tube and a step-up transformer, which are characterized as:
  • the two gates of the depletion FET are directly connected to the input signal source at the same time, and only connected to the input signal source.
  • the two gates of the depletion-type FET are directly connected to the secondary of the step-up transformer at the same time, and are only connected to the secondary of the step-up transformer.
  • a depletion type FET is used.
  • the amplifier input and output stage FETs have no biased gates, which eliminates the influence of the power supply circuit on the gates of the FETs and improves the sound quality.
  • FIG. 1 is a detailed circuit diagram of the first embodiment of the present invention.
  • FIG 2 is an equivalent circuit diagram of a second embodiment of the present invention.
  • Figure 3 is an equivalent circuit diagram of the third embodiment of the present invention.
  • Figure 4 is an equivalent circuit diagram of a fourth embodiment of the present invention.
  • FIG. 5 a, 5b is an equivalent circuit diagram of a fifth embodiment of the present invention.
  • FIG. 6 is an equivalent circuit diagram of a sixth embodiment of the present invention.
  • FIG. I is an equivalent circuit diagram of a seventh embodiment of the present invention.
  • Ri and R2 are input resistances, where R2 is grounded.
  • the input stage 1 uses a symmetrical source complementary source follower, of which T and T 2 are depletion field effect transistors.
  • T and T 2 are depletion field effect transistors.
  • the role of the audio transformer 2 is to couple the boost.
  • the boost (transformation) ratio of the transformer determines the voltage gain of the entire amplifier. Boosting ratio is usually 2 - 40 to choose between.
  • Audio transformers 2 should use high-quality products (such as the transformer described in the utility model patent with the patent number 97200573.0 and the "new-type iron-core structure transformer").
  • the secondary winding of the audio transformer 2 is directly connected to the output stage 3.
  • R5 can adjust the Q value of the transformer.
  • the output stage 3 also uses a symmetrical source complementary source follower. Among them, T 3 and T 4 use depletion field effect transistors.
  • R9 and R10 are the midpoint potential adjustment resistors of the output stage. By adjusting resistors R9 and R10 accordingly, the static midpoint potential of the output stage is 0V, which can be directly connected to the external load 4.
  • RL is the load resistance, and R6, R7, R8, and R11 are decoupling resistors.
  • the input impedance of the above amplifier is relatively high (up to 200K), so the input end can be directly connected to a high-quality signal source such as a laser record player or a preamplifier.
  • the FETs in the input stage and output stage can be connected in parallel with multiple tubes to increase the current output capability.
  • the gate bias resistor is eliminated. Therefore, the influence of the gate bias circuit on the useful signal is eliminated, thereby improving fidelity and simplifying the circuit.
  • FIG. 2 An equivalent circuit diagram of the second embodiment of the present invention is shown in FIG. 2 .
  • the input stage and output stage in the figure are the same as the first embodiment described above, except that two coupled boost transformers are used.
  • the input ends of these two transformers are connected in parallel and the output ends are connected in series to improve Output voltage amplitude.
  • the equivalent circuit diagram of the third embodiment of the present invention is shown in Figure 3.
  • the input stage and coupling transformer in the figure are the same as the first embodiment described above, except that the output stage continuously uses two symmetrical power supplies to complement each other.
  • the source follower, and the latter symmetrical source complementary source follower can use a high-power enhanced field effect tube to further improve the current output capability.
  • FIG. 4 An equivalent circuit diagram of the fourth embodiment of the present invention is shown in FIG. 4 .
  • the coupling transformer in the figure uses two transformers. The primary of these two transformers are connected in parallel, and the secondary of one transformer is Inverting output. In the output stage, two identical continuous two-stage connected symmetrical source complementary source followers with high-power enhanced field effect tubes are used as the bridge output to increase the output power.
  • the equivalent circuit diagrams of the fifth embodiment of the present invention are shown in Figs. 5a and 5b.
  • the amplifier of the present invention can also be used in two or more stages. When the two stages are used in combination, as shown in FIG. 5a, the amplifier of the present invention can be composed of three symmetrical source complementary source followers and two transformers, which has the advantage that the circuit is relatively simple. Further, when the two may be used in conjunction with FIG. 5 b as shown in direct conjunction, the advantage that the current supply capability can be improved to promote the intermediate stage.
  • FIG. 6 An equivalent circuit diagram of a sixth embodiment of the present invention is shown in FIG. 6.
  • a field effect transistor may adopt two or more tubes in parallel according to the requirements of use (as shown in the figure). n tubes in parallel) to improve current output capability.
  • FIG. 7 An equivalent circuit diagram of a seventh embodiment of the present invention is shown in Figure 7.
  • the primary and secondary coils of the above-mentioned transformers have intermediate ground taps, and the input stage and the output stage of the amplifier are respectively connected to the same two symmetrical power sources described above.
  • Complementary source follower The output ends of the two symmetric power complementary source followers in the input stage are connected to both ends of the transformer primary line ⁇ , and the inputs of the two symmetric power complementary source followers in the output stage are respectively connected to the transformer secondary The two ends of the coil are connected to make the amplifier perform balanced input and balanced output.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Amplifiers (AREA)

Abstract

The present invention relates to an amplifier. It consists of a coupled transformer and two complementary type source-followers which are connected with the terminal of the input-output of the transformer and with the symmetric power. The input and output stage of the amplifier use MOS-type FET, omitted the gate bias resistor. Accordingly, the effects of the gate bias resistor on the useful signal can be eliminated so that the high fidelity can be improved while the circuit becomes simple. The amplifier of the present invention has some advantages such as the simple circuit, low cost, excellent efficiency and working stable. Moreover, it can be used in the HI-FI power and other electroacoustic products.

Description

放 大 器 本发明涉及一种放大器， 更具体地说， 涉及一种由耦合升压变压器和 对称电源互补源极跟随器构成的放大器。  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amplifier, and more particularly, to an amplifier composed of a coupled boost transformer and a symmetrical source complementary source follower.

众所周知， 现有的种类繁多的音频放大器无论采用何种类型的电路， 其设计目的都是为了取得更完美的音质和更稳定优异的电气性能。 而为了 达到上述两项目的， 通常所采取的环路负反馈及漏极（集电极） 电压放大 等技术措施常使电路更为复杂。 同时， 近年来的研究也表明， 环路负反馈 虽然提高了放大器的静态技术指标， 却使放大器的动态指标降低， 在一定 程度上恶化了音质。  As everyone knows, no matter what type of circuit is used in the existing audio amplifiers, the design purpose is to obtain more perfect sound quality and more stable and excellent electrical performance. In order to achieve the above two items, the technical measures such as loop negative feedback and drain (collector) voltage amplification are usually used to make the circuit more complicated. At the same time, recent studies have also shown that although the loop negative feedback improves the static technical index of the amplifier, it reduces the dynamic index of the amplifier and deteriorates the sound quality to a certain extent.

本发明的目的在于提供一种能大幅度简化电路、 降低制造成本、 并具 有完美的音质和稳定优异的电气性能的放大器。  An object of the present invention is to provide an amplifier that can greatly simplify a circuit, reduce manufacturing costs, and has perfect sound quality and excellent electrical performance.

本发明所述的放大器包括： 作为放大器输入级和输出级的、 两个使用 耗尽型场效应管的对称电源互补源极跟随器和一个升压变压器， 其特征在 于： 在作为上述的放大器输入级的对称电源互补源极跟随器中， 耗尽型场 效应管的两个栅极同时直接与输入信号源连接， 并且只与输入信号源连 接； 在作为上述的放大器输出级的对称电源互补源极跟随器中， 耗尽型场 效应管的两个栅极同时直接与升压变压器的次级连接， 并且只与升压变压 器的次级连接.  The amplifier according to the present invention comprises: as input stage and output stage of the amplifier, two symmetrical power source complementary source followers using a depletion type field effect tube and a step-up transformer, which are characterized as: In the symmetrical source complementary source follower of the first stage, the two gates of the depletion FET are directly connected to the input signal source at the same time, and only connected to the input signal source. In the pole follower, the two gates of the depletion-type FET are directly connected to the secondary of the step-up transformer at the same time, and are only connected to the secondary of the step-up transformer.

本发明的放大器具有如下优点：  The amplifier of the present invention has the following advantages:

1. 电路简单， 成本低， 放大性能优异， 且工作稳定；  1. Simple circuit, low cost, excellent amplification performance, and stable operation;

2. 采用了耗尽型场效应管， 放大器输入、 输出级场效应管的栅极无偏 置电路， 消除了电源电路对场效应管栅极的影响， 提高了音质。  2. A depletion type FET is used. The amplifier input and output stage FETs have no biased gates, which eliminates the influence of the power supply circuit on the gates of the FETs and improves the sound quality.

3. 由于输入、 榆出级只做电流放大且互相独立无反馈， 因而减少了放 大器的瞬态失真， 使声音更加真实、 自然。  3. Because the input and output stages only perform current amplification and are independent of each other without feedback, the transient distortion of the amplifier is reduced, and the sound is more realistic and natural.

图 1是本发明的第 1个实施例的详细电路图，  FIG. 1 is a detailed circuit diagram of the first embodiment of the present invention.

图 2是本发明的第 2个实施例的等效电路图。 FIG 2 is an equivalent circuit diagram of a second embodiment of the present invention.

图 3是本发明的第 3个实施例的等效电路图. Figure 3 is an equivalent circuit diagram of the third embodiment of the present invention.

图 4是本发明的第 4个实施例的等效电路图. Figure 4 is an equivalent circuit diagram of a fourth embodiment of the present invention.

图 5a、 5b是本发明的第 5个实施例的等效电路图。 FIG. 5 a, 5b is an equivalent circuit diagram of a fifth embodiment of the present invention.

图 6是本发明的第 6个实施例的等效电路图。 图，是本发明的第 7个实施例的等效电路图。 Fig. 6 is an equivalent circuit diagram of a sixth embodiment of the present invention. FIG. Is an equivalent circuit diagram of a seventh embodiment of the present invention.

下面通过几个实施例来对本发明进行详细描述.  The following describes the present invention in detail through several embodiments.

本发明的第 1个实施例的详细电路图见图 1。 图 1中， Ri、 R2为输 入电阻， 其中 R2接地。 输入级①采用了对称电源互补源极跟随器， 其中 的 T 、 T2采用的是耗尽型场效应管。 调整 R3的阻值， 可使静态输出中点 电位为零， 因而可与作为输入级负载的耦合变压器直接连接而不用另加电 容器。 音频变压器②的作用是耦合升压， 该变压器的升压（变） 比决定了 整个放大器的电压增益。 升压比通常在 2 - 40之间选择。 音频变压器②应 选用优质品（如专利号为 97200573.0、 题为 "新型铁芯结构变压器" 的实 用新型专利中所述的变压器）。 音频变压器②的次级绕组与输出级③直接 连接。 R5可调整变压器的 Q值。 输出级③采用的也是对称电源互补源极 跟随器， 其中 Τ3、 Τ4采用的是耗尽型场效应管. R9、 R10为输出级的 中点电位调整电阻。 通过对电阻 R9、 R10加以相应的调整， 使输出级的 静态中点电位为 0V， 使之可同外接负载④直接相连。 RL为负载电阻， R6、 R7、 R8、 R11为去耦电阻。 A detailed circuit diagram of the first embodiment of the present invention is shown in FIG. In Figure 1, Ri and R2 are input resistances, where R2 is grounded. The input stage ① uses a symmetrical source complementary source follower, of which T and T 2 are depletion field effect transistors. By adjusting the resistance of R3, the potential at the neutral point of the static output can be zero, so it can be directly connected to the coupling transformer as an input stage load without additional capacitors. The role of the audio transformer ② is to couple the boost. The boost (transformation) ratio of the transformer determines the voltage gain of the entire amplifier. Boosting ratio is usually 2 - 40 to choose between. Audio transformers ② should use high-quality products (such as the transformer described in the utility model patent with the patent number 97200573.0 and the "new-type iron-core structure transformer"). The secondary winding of the audio transformer ② is directly connected to the output stage ③. R5 can adjust the Q value of the transformer. The output stage ③ also uses a symmetrical source complementary source follower. Among them, T 3 and T 4 use depletion field effect transistors. R9 and R10 are the midpoint potential adjustment resistors of the output stage. By adjusting resistors R9 and R10 accordingly, the static midpoint potential of the output stage is 0V, which can be directly connected to the external load ④. RL is the load resistance, and R6, R7, R8, and R11 are decoupling resistors.

作为放大器使用时， 由于上述放大器的输入阻抗较高（达 200K ) , 故输入端可直接接到激光唱机等优质信号源或前置放大器上。  When used as an amplifier, the input impedance of the above amplifier is relatively high (up to 200K), so the input end can be directly connected to a high-quality signal source such as a laser record player or a preamplifier.

在需要时， 输入级和输出级中的场效应管可接成多管并联形式， 以提 高电流揄出能力。  When needed, the FETs in the input stage and output stage can be connected in parallel with multiple tubes to increase the current output capability.

由于本发明的放大器的输入、 输出级采用了耗尽型场效应管， 省去了 栅极偏置电阻。 因此， 栅极偏置电路对有用信号的影响得以消除， 从而提 高了保真度， 也简化了电路。  Because the input and output stages of the amplifier of the present invention use a depletion-type FET, the gate bias resistor is eliminated. Therefore, the influence of the gate bias circuit on the useful signal is eliminated, thereby improving fidelity and simplifying the circuit.

本发明的第 2个实施例的等效电路图见图 2。 图中的输入级和输出级 与上面描述过的第 1个实施例相同， 所不同的是采用了二个耦合升压变压 器， 这二个变压器的输入端并联连接， 输出端串联连接， 以提高输出电压 幅度。 An equivalent circuit diagram of the second embodiment of the present invention is shown in FIG. 2 . The input stage and output stage in the figure are the same as the first embodiment described above, except that two coupled boost transformers are used. The input ends of these two transformers are connected in parallel and the output ends are connected in series to improve Output voltage amplitude.

本发明的第 3个实施例的等效电路图见图 3 . 图中的输入级和耦合变 压器与上面描述过的第 1个实施例相同， 所不同的是输出级连续采用了二 个对称电源互补源极跟随器， 而后一个对称电源互补源极跟随器可以采用 大功率的增强型场效应管， 以进一步提高电流输出能力。 The equivalent circuit diagram of the third embodiment of the present invention is shown in Figure 3. The input stage and coupling transformer in the figure are the same as the first embodiment described above, except that the output stage continuously uses two symmetrical power supplies to complement each other. The source follower, and the latter symmetrical source complementary source follower can use a high-power enhanced field effect tube to further improve the current output capability.

本发明的第 4个实施例的等效电路图见图 4。 图中的耦合变压器采用 了两个变压器， 这两个变压器的初级并联连接， 其中一个变压器的次级为 反相输出。 在输出级采用了两个相同的连续两级相连的、 输出管为大功率 增强型场效应管的对称电源互补源极跟随器作桥式输出， 以提高输出功 率. An equivalent circuit diagram of the fourth embodiment of the present invention is shown in FIG. 4 . The coupling transformer in the figure uses two transformers. The primary of these two transformers are connected in parallel, and the secondary of one transformer is Inverting output. In the output stage, two identical continuous two-stage connected symmetrical source complementary source followers with high-power enhanced field effect tubes are used as the bridge output to increase the output power.

本发明的第 5个实施例的等效电路图见图 5a、 5b。 本发明的放大器 还可以两级连用或多级连用。 两级连用时， 如图 5a所示， 本发明的放大器 可以由三个对称电源互补源极跟随器和两个变压器組成， 其优点是电路比 较简单。 另外， 两级连用时也可以如图 5b所示的那样直接连用， 这样做的 优点是可以提高中间推动级的电流供给能力。 The equivalent circuit diagrams of the fifth embodiment of the present invention are shown in Figs. 5a and 5b. The amplifier of the present invention can also be used in two or more stages. When the two stages are used in combination, as shown in FIG. 5a, the amplifier of the present invention can be composed of three symmetrical source complementary source followers and two transformers, which has the advantage that the circuit is relatively simple. Further, when the two may be used in conjunction with FIG. 5 b as shown in direct conjunction, the advantage that the current supply capability can be improved to promote the intermediate stage.

本发明的第 6个实施例的等效电路图见图 6。 如图 6所示， 在作为放 大器的输入级或输出级的对称电源互补源极跟随器中， 场效应管可以根据 使用要求采用两管或两管以上的多管并联（如图中所示的 n管并联） ， 以 提高电流输出能力。 An equivalent circuit diagram of a sixth embodiment of the present invention is shown in FIG. 6. As shown in FIG. 6 , in a complementary power source follower of a symmetrical power supply as an input stage or an output stage of an amplifier, a field effect transistor may adopt two or more tubes in parallel according to the requirements of use (as shown in the figure). n tubes in parallel) to improve current output capability.

本发明的第 7个实施例的等效电路图见图 7 . 图中， 上述变压器的初、 次级线圈均有中间接地抽头， 放大器的输入级和输出级分别接有两个相同 的上述对称电源互补源极跟随器。 输入级中的两个对称电源互补源极跟随 器的输出端分别与变压器初级线圏的两端相接， 揄出级中的两个对称电源 互补源极跟随器的输入端分别与变压器次级线圈的两端相接， 使该放大器 作平衡输入和平衡输出。 An equivalent circuit diagram of a seventh embodiment of the present invention is shown in Figure 7. In the figure, the primary and secondary coils of the above-mentioned transformers have intermediate ground taps, and the input stage and the output stage of the amplifier are respectively connected to the same two symmetrical power sources described above. Complementary source follower. The output ends of the two symmetric power complementary source followers in the input stage are connected to both ends of the transformer primary line 圏, and the inputs of the two symmetric power complementary source followers in the output stage are respectively connected to the transformer secondary The two ends of the coil are connected to make the amplifier perform balanced input and balanced output.

以上我们对本发明的几个最佳实施例进行了详细描述。 但是， 很显然， 本技术领域内的熟练人员还可以对本发明进行各种修改、 变更和替换。 申 请人认为， 这些修改、 变更和替换也落入后面的权利要求书所定义的本发 明的范围之内。  We have described in detail several preferred embodiments of the present invention. However, it is obvious that those skilled in the art can also make various modifications, changes and substitutions to the present invention. The applicant believes that these modifications, changes and substitutions also fall within the scope of the present invention as defined in the following claims.

Claims

权 利 要 求 Rights request 1. 一种放大器， 包括： 作为放大器输入级和输出级的、 两个使用耗尽 型场效应管的对称电源互补源极跟随器和一个升压变压器， 1. An amplifier comprising: two complementary source followers of a symmetrical power supply using a depletion field-effect transistor as an input stage and an output stage of the amplifier, and a step-up transformer, 其特征在于：  It is characterized by: 在作为上述的放大器输入级的对称电源互补源极跟随器中， 耗尽型场 效应管的两个栅极同时直接与输入信号源连接， 并且只与输入信号源连 接； 在作为上述的放大器输出级的对称电源互补源极跟随器中， 耗尽型场 效应管的两个栅极同时直接与升压变压器的次级连接， 并且只与升压变压 器的次级连接，  In the above-mentioned symmetrical source complementary source follower of the amplifier input stage, the two gates of the depletion-type FET are directly directly connected to the input signal source at the same time, and only connected to the input signal source; In the symmetrical source complementary source follower of the first stage, the two gates of the depletion FET are directly connected to the secondary of the step-up transformer at the same time, and only connected to the secondary of the step-up transformer. 2. 如权利要求 1 所述的放大器， 其特征在于： 上述的升压变压器由两 个变压器构成， 这两个变压器的输出端串联， 输入端并联。  2. The amplifier according to claim 1, wherein the step-up transformer is composed of two transformers, the output ends of the two transformers are connected in series and the input ends are connected in parallel. 3. 如权利要求 1 所述的放大器， 其特征在于： 上述耦合升压变压器的 输出端连续接有两级对称电源互补源极跟随器。  3. The amplifier according to claim 1, wherein: the output end of the coupled boost transformer is continuously connected with two-stage symmetrical source complementary source followers. 4· 如权利要求 1 所述的放大器， 其特征在于： 所述放大器包括两个耦 合升压变压器， 这两个耦合升压变压器的输入端并接， 输出端中有一个反 相输出； 所述的两个耦合升压变压器的输出端分别接有相同的连续接有两 级的对称电源互补源极跟随器， 做桥式输出。  4. The amplifier according to claim 1, wherein: the amplifier comprises two coupled boost transformers, the input ends of the two coupled boost transformers are connected in parallel, and an inverting output is provided in the output end; The output terminals of the two coupled boost transformers are respectively connected with the same two-stage symmetrical source complementary source followers connected in succession to make a bridge output. 5. 如权利要求 1 所述的放大器， 其特征在于： 上述放大器可以两级或 多级连接在一起使用。  5. The amplifier according to claim 1, wherein the amplifier can be used by connecting two or more stages together. 6. 如权利要求 1所述的放大器， 其特征在于： 上述放大器的输入级和 / 或输出级中的对称电源互补源极跟随器中， 所述耗尽型场效应管为多管并 联。  6. The amplifier according to claim 1, wherein in the symmetric power complementary source follower in the input stage and / or output stage of the amplifier, the depletion type field effect transistors are multi-tube parallel. 7· 如权利要求 1 所述的放大器， 其特征在于： 所述放大器的升压耦合 变压器的初、 次级线團均有中间接地抽头， 放大器的输入级和输出级分别 接有两个相同的对称电源互补源极跟随器， 所述放大器作平衡输入和平衡 输出。  7. The amplifier according to claim 1, characterized in that: the primary and secondary wires of the step-up coupling transformer of the amplifier have intermediate ground taps, and the input stage and the output stage of the amplifier are respectively connected with two identical A symmetrical source complementary source follower, and the amplifier serves as a balanced input and a balanced output.
PCT/CN1998/000063 1998-04-17 1998-04-17 Amplifier Ceased WO1999054993A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU69173/98A AU6917398A (en) 1998-04-17 1998-04-17 Amplifier
PCT/CN1998/000063 WO1999054993A1 (en) 1998-04-17 1998-04-17 Amplifier

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4140976A (en) * 1977-09-22 1979-02-20 David Wartofsky Thermally stable push-pull amplifier
US4159450A (en) * 1978-05-22 1979-06-26 Rca Corporation Complementary-FET driver circuitry for push-pull class B transistor amplifiers
US4194165A (en) * 1978-06-28 1980-03-18 Skulski Peter J Miniature guitar amplifier
CN2096845U (en) * 1991-07-01 1992-02-19 胡秋野 Supper-line transistor audio-frequency power amplifier

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4140976A (en) * 1977-09-22 1979-02-20 David Wartofsky Thermally stable push-pull amplifier
US4159450A (en) * 1978-05-22 1979-06-26 Rca Corporation Complementary-FET driver circuitry for push-pull class B transistor amplifiers
US4194165A (en) * 1978-06-28 1980-03-18 Skulski Peter J Miniature guitar amplifier
CN2096845U (en) * 1991-07-01 1992-02-19 胡秋野 Supper-line transistor audio-frequency power amplifier

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