CN103066968B - A kind of level restorer for transfer tube selector - Google Patents

Abstract

The invention discloses a kind of level restorer for transfer tube selector, relate to integrated circuit technique, when selector is made up of one-level or N level NMOS transfer tube, level restorer is made up of a NMOS tube and a PMOS, the drain electrode of PMOS is connected on selector output end, and source class meets power end vdd, and the leakage level of NMOS tube connects with the grid of PMOS, source class meets power end gnd, and grid connects the output of selector.When circuit of the present invention guarantees that selector does not work, the output of selector is not floating level, high level is pulled to by trombone slide on the PMOS of level restorer, avoid output connect gate circuit steady state short circuit current produce, during selector work, when transfer tube selector occurs that threshold value declines, guarantee that level restorer can pull-up fast, avoid the generation of steady state short circuit current.Circuit area overhead of the present invention is little, while elimination steady state short circuit current, improves the performance of circuit.

Description

A level restorer for transmission tube selector

technical field

The invention relates to the technical field of integrated circuits, in particular to a structural design of a high-speed circuit, and is a level restorer used for a transmission tube selector.

Background technique

The MOS transmission tube will have a threshold change when it transmits a high level or a low level. For a single NMOS tube, when transmitting a high level, the maximum output voltage is vdd-vth; for a single PMOS tube, when transmitting a low level, the output The minimum voltage is vth. For the next-level CMOS circuit, when the current NMOS tube transmits a high level, or the PMOS tube transmits a low level, the PMOS tube and the NMOS tube of the CMOS circuit will be in the conduction state at the same time, resulting in a short circuit. Current, this short-circuit current increases the static power consumption of the chip.

The level restorer of existing solution is shown in X72 of Fig. 7, and this circuit is made up of an inverter plus a PMOS pull-up tube (Jan M.Rabaey, AnanthaChandrakasan, Borivoje Nikolic, digital integrated circuit--design perspective, Tsinghua University Press. 274-275.2004), but an inverter X73 needs to be added later (to ensure that the logic of the signal remains unchanged). When the selector circuit is not working, the output terminal of the selector can be pulled to a high level through the level restorer, but due to the use of an inverse ratio tube, the pull-up time is longer, resulting in power consumption. However, if the output drive of the selector is a gate circuit, we need to add a level restorer (as shown in X82 in Figure 8) to the non-transmission path, which will increase the delay while increasing the area.

Contents of the invention

The purpose of the present invention is to propose a level restorer for the transmission tube selector to overcome the shortcomings of the prior art, which can quickly eliminate the threshold value change of the output voltage of the transmission tube, thereby reducing the delay of the circuit.

For achieving the above object, technical solution of the present invention is:

A level restorer for a transmission tube selector, comprising: a selector circuit composed of one-level or N-level NMOS transmission tubes; it also includes a level restorer; the level restorer includes an NMOS transistor and a PMOS tube, the drain of the PMOS tube is connected to the output terminal of the selector, the source is connected to the power supply terminal vdd, the drain of the NMOS tube is connected to the gate of the PMOS tube, the source of the NMOS tube is connected to the power supply terminal gnd, and the gate is connected to the selector the output terminal of the device.

In the level restorer used for the transmission tube selector, the NMOS transistor in the level restorer is connected to the gate of the PMOS transistor after the gate drain of the NMOS transistor itself is connected, and the source of the NMOS transistor The stage is connected to the power terminal gnd.

The level restorer used for the transmission tube selector, the level restorer includes an NMOS transistor and two PMOS transistors, the drain of the first PMOS transistor is connected to the output terminal of the selector, and the source stage Connect to the power supply terminal vdd, connect the gate and drain of the NMOS tube itself, and then connect to the gate of the first PMOS tube, the source of the NMOS tube is connected to the power supply terminal gnd, and connect the gate and drain of the second PMOS tube itself to the gate of the NMOS tube The gate is connected, and the source of the second PMOS tube is connected to the power supply terminal vdd.

A level restorer for a transmission tube selector, comprising: a selector circuit composed of one-level or N-level PMOS transmission tubes; it also includes a level restorer; the level restorer includes an NMOS transistor and a The drain of the PMOS tube, the drain of the NMOS tube is connected to the output terminal of the selector, the source is connected to the power supply terminal gnd, the drain of the PMOS tube is connected to the gate of the NMOS tube, the source of the PMOS tube is connected to the power supply terminal vdd, and the gate is connected to the selector the output terminal of the device.

In the level restorer used for the transmission tube selector, the PMOS transistor in the level restorer is connected to the gate of the NMOS transistor after the gate drain of the PMOS transistor itself is connected, and the source of the PMOS transistor The stage is connected to the power supply terminal vdd.

The level restorer for the transmission tube selector, the level restorer includes two NMOS transistors and a PMOS transistor, the drain of the first NMOS transistor is connected to the output terminal of the selector, and the source stage Connect to the power supply terminal gnd, the gate drain of the PMOS tube itself is connected to the gate of the first NMOS tube, the source of the PMOS tube is connected to the power supply terminal vdd, and the gate drain of the second NMOS tube itself is connected to the gate of the PMOS tube connected, and the source of the second NMOS tube is connected to the power terminal gnd.

Compared with the prior art, the circuit of the present invention has the beneficial effects that: when the transmission tube selector circuit is not working, the level restorer can very quickly place the output end of the selector at a fixed level, greatly reducing the The pull-up or pull-down time is reduced, and the static power consumption is reduced. When the selector circuit is working, the level restorer can quickly eliminate the threshold change of the output voltage of the transmission tube, thereby reducing the short-circuit current and circuit delay; compared with the traditional level Compared with the restorer, the level recovery speed of the present invention is faster, so that the delay of the selector is smaller, and it can be applied to the situation when the subsequent driving circuit is a gate circuit, while the pull-up or pull-up of the traditional level restorer The pull-down tube must span an inverter and use a feedback loop. When the post-stage drive circuit is a gate circuit, it is necessary to add an inverter and a MOS tube to the non-transmission path, which increases the area and also reduces the Increase the delay.

Description of drawings

Fig. 1 is a schematic diagram of Embodiment 1 of a level restorer for a transmission tube selector of the present invention, which is a selector circuit for NMOS tubes;

Fig. 2 is a schematic diagram of Embodiment 2 of a level restorer for a transmission tube selector of the present invention, which is a selector circuit for NMOS tubes;

Fig. 3 is a schematic diagram of Embodiment 3 of a level restorer for a transmission tube selector of the present invention, which is a selector circuit for NMOS tubes;

Fig. 4 is a schematic diagram of Embodiment 4 of a level restorer for a transmission tube selector of the present invention, which is a selector circuit for a PMOS tube;

Fig. 5 is a schematic diagram of Embodiment 5 of a level restorer for a transmission tube selector of the present invention, which is a selector circuit for a PMOS tube;

Fig. 6 is a schematic diagram of Embodiment 6 of a level restorer for a transmission tube selector of the present invention, which is a selector circuit for a PMOS tube;

FIG. 7 is an existing level restorer for a selector circuit composed of NMOS transistors;

FIG. 8 is a conventional level restorer for a selector circuit composed of NMOS transistors when the output is driven as a gate circuit.

Detailed ways

A level restorer used for the transmission tube selector of the present invention, wherein the level restorer has the following implementation methods:

(1) A level restorer for a selector circuit composed of NMOS transistors. The level restorer is composed of an NMOS transistor and a PMOS transistor. The drain of the PMOS transistor is connected to the output terminal of the selector, and the source is connected to the selector circuit. The power supply terminal vdd, the drain of the NMOS transistor is connected to the gate of the PMOS transistor, the source of the NMOS transistor is connected to the power supply terminal gnd, and the gate is connected to the output terminal of the selector.

(2) A level restorer for a selector circuit composed of NMOS transistors. The level restorer is composed of an NMOS transistor and a PMOS transistor. The drain of the PMOS transistor is connected to the output terminal of the selector, and the source is connected to the selector circuit. The power supply terminal vdd, the gate drain of the NMOS tube are connected to the gate of the PMOS tube, and the source of the NMOS tube is connected to the power supply terminal gnd.

(3) A level restorer for a selector circuit composed of NMOS transistors, the level restorer is composed of an NMOS transistor and two PMOS transistors, the drain of the first PMOS transistor is connected to the output terminal of the selector, The source is connected to the power supply terminal vdd, the gate and drain of the NMOS transistor are connected to the gate of the first PMOS transistor, the source of the NMOS transistor is connected to the power supply terminal gnd, and the gate and drain of the second PMOS transistor are connected to the gate of the NMOS transistor Connected, the source of the second PMOS tube is connected to the power terminal vdd.

(4) A level restorer for a selector circuit composed of PMOS transistors, the level restorer is composed of an NMOS transistor and a PMOS transistor, the drain of the NMOS transistor is connected to the output terminal of the selector, and the source is connected to The power supply terminal gnd, the drain of the PMOS transistor is connected to the gate of the NMOS transistor, the source of the PMOS transistor is connected to the power supply terminal vdd, and the gate is connected to the output terminal of the selector.

(5) A level restorer for a selector circuit composed of PMOS transistors. The level restorer is composed of an NMOS transistor and a PMOS transistor. The drain of the NMOS transistor is connected to the output terminal of the selector, and the source is connected to the selector circuit. The power terminal gnd, the gate drain of the PMOS transistor are connected to the gate of the NMOS transistor, and the source of the PMOS transistor is connected to the power supply terminal vdd.

(6) A level restorer for a selector circuit formed by a PMOS transistor, the level restorer is composed of two NMOS transistors and a PMOS transistor, the drain of the first NMOS transistor is connected to the output terminal of the selector, The source is connected to the power supply terminal gnd, the gate and drain of the PMOS transistor are connected and then connected to the gate of the first NMOS transistor, the source of the PMOS transistor is connected to the power supply terminal vdd, and the gate and drain of the second NMOS transistor are connected to the gate of the PMOS transistor connected, and the source of the second NMOS tube is connected to the power terminal gnd.

Describe in detail below in conjunction with accompanying drawing.

Embodiment 1, as shown in Figure 1, X11 is a one-level or N-level selector composed of NMOS transistors, the output terminal is out, and the level restorer X12 is composed of PMOS transistor MP11 and NMOS transistor MN11; the drain of MP11 is connected to At the output terminal out of the selector, the source is connected to the power supply terminal vdd, the drain of MN11 is connected to the gate of MP11, the source is connected to the power supply terminal gnd, and the gate is connected to the output terminal out of the selector. When the selector is not working, the output terminal out will be quickly pulled up to high level by MP11 through the positive feedback loop of MN11 and MP11, thereby reducing the static power consumption of the subsequent CMOS circuit; when the N-level selector is working, the input When the signal flips from 0 to vdd, the out terminal can only be charged to vdd-N (vth), but through the positive feedback of MN11 and MP11, there will be no threshold loss when the out terminal outputs a high level, and it will quickly output a Vdd, because there is no slow pull-up process of the traditional level restorer, the delay of the selector circuit will also be reduced.

Embodiment 2, as shown in Figure 2, X21 is a one-level or N-level selector composed of NMOS transistors, the output terminal is out, and the level restorer X22 is composed of PMOS transistor MP21 and NMOS transistor MN21; the drain of MP21 is connected to At the output terminal out of the selector, the source level is connected to the power supply terminal vdd, the gate and drain of MN21 are connected and then connected to the gate of MP21, and the source level is connected to the power supply terminal gnd. When the selector is not working, the value of net2 will be pulled down to low level through the conduction of MN21, and the output terminal out will be quickly pulled up to high level by MP21, thereby reducing the static power consumption of the subsequent CMOS circuit; when N The stage selector works, when the input signal is flipped from 0 to vdd, the out terminal can only be charged to vdd-N (vth), but through the pull-up effect of MP21, there will be no threshold loss when the out terminal outputs a high level, It will quickly output a vdd. Since there is no slow pull-up process of the traditional level restorer, the delay of the selector circuit will also be reduced. Compared with the level restorer X11 shown in Figure 1, X22 does not exist in a floating state The line, net2 will be quickly pulled to zero level to ensure that there is no leakage when the circuit is not working.

Embodiment 3, as shown in Figure 3, X31 is a one-level or N-level selector composed of NMOS transistors, the output terminal is out, and the level restorer X32 is composed of NMOS transistors MN31 and PMOS transistors MP31, MP32; the drain of MP31 The pole is connected to the output terminal out of the selector, the source is connected to the power supply terminal vdd, the gate and drain of MN31 are connected to the gate of MP31, the source is connected to the power supply terminal gnd, the gate and drain of MP32 are connected to the gate of MN31 Connected, the source level is connected to the power supply terminal vdd. When the selector is not working, the value of net3 will be pulled to low level through the conduction of MN31, and the output terminal out will be quickly pulled up to high level by MP31, thereby reducing the static power consumption of the subsequent CMOS circuit; when N The level selector works, when the input signal is flipped from 0 to vdd, the out terminal can only be charged to vdd-N (vth), but through the pull-up effect of MP31, there will be no threshold loss when the out terminal outputs a high level, It will quickly output a vdd. Since there is no slow pull-up process of the traditional level restorer, the delay of the selector circuit will also be reduced. Compared with the level restorer X11 shown in Figure 1, there is no floating state in X32 line, net3 will be quickly pulled to zero level to ensure that there is no leakage when the circuit is not working; compared with the level restorer X22 shown in Figure 2, when the selector transmits zero level, due to the existence of MP32, making Net3 is at zero level only for a period of time, the pull-up effect of MP31 will be weakened, and the actual voltage value of out should be low, so that the leakage of the subsequent CMOS circuit will be reduced.

Embodiment 4, as shown in Figure 4, X41 is a one-level or N-level selector composed of PMOS transistors, the output terminal is out, and the level restorer X42 is composed of NMOS transistor MN41 and PMOS transistor MP41; the drain of MN41 is connected to At the output terminal out of the selector, the source is connected to the power supply terminal gnd, the drain of MP41 is connected to the gate of MN41, its source is connected to the power supply terminal vdd, and the gate is connected to the output terminal out of the selector. When the selector is not working, the output terminal out will be quickly pulled down to low level by MN41 through the positive feedback loop of MN41 and MP41, thereby reducing the static power consumption of the subsequent CMOS circuit; when the N-level selector is working, the input When the signal flips from vdd to 0, the out terminal can only be discharged to N (vth), but through the positive feedback of MN41 and MP41, there will be no threshold increase when the out terminal outputs a low level, and a gnd will be output quickly. Since there is no slow pull-down process of the traditional level restorer, the delay of the selector circuit is also reduced.

Embodiment 5, as shown in Figure 5, X51 is a one-level or N-level selector composed of PMOS transistors, the output terminal is out, and the level restorer X52 is composed of NMOS transistors MN51 and PMOS transistors MP51; the drain of MN51 is connected to At the output terminal out of the selector, the source level is connected to the power supply terminal gnd, the gate and drain of MP51 are connected and then connected to the gate of MN51, and the source level is connected to the power supply terminal vdd. When the selector is not working, the value of net5 will be pulled to a high level through the conduction of MP51, and the output terminal out will be quickly pulled down to a low level by MN51, thereby reducing the static power consumption of the subsequent CMOS circuit; when N The level selector works, when the input signal is flipped from vdd to 0, the out terminal can only be discharged to N (vth), but through the pull-down effect of MN51, there will be no threshold increase when the out terminal outputs a low level, and a gnd, because there is no slow pull-down process of the traditional level restorer, the delay of the selector circuit will also be reduced. Compared with the level restorer X42 shown in Figure 4, there is no line in the floating state in X52, and net5 will Pulled to high level quickly to ensure that there is no leakage when the circuit is not working.

Embodiment 6, as shown in Figure 6, X61 is a one-level or N-level selector composed of PMOS transistors, the output terminal is out, and the level restorer X62 is composed of PMOS transistors MP61 and NMOS transistors MN61, MN62; the drain of MN61 The pole is connected to the output terminal out of the selector, the source is connected to the power supply terminal gnd, the gate and drain of MP61 are connected to the gate of MN61, the source is connected to the power supply terminal vdd, the gate and drain of MN62 are connected to the gate of MP61 Connected, the source is connected to the power terminal gnd. When the selector is not working, the value of net6 will be pulled to a high level through the conduction of MP61, and the output terminal out will be quickly pulled down to a low level by MN61, thereby reducing the static power consumption of the subsequent CMOS circuit; when N The level selector works, when the input signal flips from vdd to 0, the out terminal can only be discharged to N (vth), but through the pull-down effect of MN61, there will be no threshold increase when the out terminal outputs a low level, and it will output quickly One gnd, because there is no slow pull-down process of the traditional level restorer, the delay of the selector circuit will also be reduced. Compared with the level restorer X42 shown in Figure 4, there is no line in the floating state in X62, net6 It will be pulled to high level quickly to ensure that there is no leakage when the circuit is not working; compared with the level restorer X52 shown in Figure 5, when the selector transmits high level, due to the existence of MN62, net6 only has a period of time If it is high level, the pull-down effect of MN61 will be weakened, and the actual voltage value of out should be higher, so that the leakage of the subsequent CMOS circuit will be reduced.

Claims (6)

1. A level restorer for a transmission tube selector, said selector is made up of one-level or N-level NMOS transmission tubes, characterized in that said level restorer is made up of an NMOS tube and a PMOS tube , the drain of the PMOS transistor is connected to the output terminal of the selector, the source is connected to the power supply terminal vdd, the drain of the NMOS transistor is connected to the gate of the PMOS transistor, the source of the NMOS transistor is connected to the power supply terminal gnd, and the gate is connected to the selector output. 2. A level restorer for a transmission tube selector, the selector is composed of one-level or N-level NMOS transmission tubes, characterized in that the level restorer includes an NMOS tube and a PMOS tube, The drain of the PMOS tube is connected to the output terminal of the selector, the source is connected to the power supply terminal vdd, the gate and drain of the NMOS tube itself are connected, and then connected to the gate of the PMOS tube, and the source of the NMOS tube is connected to the power supply terminal gnd. 3. A level restorer for a transmission tube selector, the selector is composed of one-level or N-level NMOS transmission tubes, characterized in that the level restorer includes an NMOS tube and two PMOS tubes , where the drain of the first PMOS transistor is connected to the output terminal of the selector, the source is connected to the power supply terminal vdd, the gate and drain of the NMOS transistor itself are connected, and then connected to the gate of the first PMOS transistor, and the source of the NMOS transistor It is connected to the power supply terminal gnd, the gate and drain of the second PMOS transistor are connected to each other and then connected to the gate of the NMOS transistor, and the source of the second PMOS transistor is connected to the power supply terminal vdd. 4. A level restorer for a transmission tube selector, the selector is composed of one-level or N-level PMOS transmission tubes, characterized in that the level restorer is composed of an NMOS tube and a PMOS tube , where the drain of the NMOS transistor is connected to the output terminal of the selector, the source is connected to the power supply terminal gnd, the drain of the PMOS transistor is connected to the gate of the NMOS transistor, the source of the PMOS transistor is connected to the power supply terminal vdd, and the gate is connected to the selector output terminal. 5. A level restorer for a transmission tube selector, the selector is composed of one-level or N-level NMOS transmission tubes, characterized in that the level restorer includes an NMOS tube and a PMOS tube, The drain of the NMOS tube is connected to the output terminal of the selector, the source is connected to the power supply terminal gnd, the gate and drain of the PMOS tube itself are connected, and then connected to the gate of the NMOS tube, and the source of the PMOS tube is connected to the power supply terminal vdd. 6. A level restorer for a transmission tube selector, the selector is composed of one-level or N-level NMOS transmission tubes, characterized in that the level restorer includes two NMOS tubes and one PMOS tube , wherein the drain of the first NMOS transistor is connected to the output terminal of the selector, the source is connected to the power supply terminal gnd, the gate and drain of the PMOS transistor itself are connected to the gate of the first NMOS transistor, and the source of the PMOS transistor is connected to the power supply Terminal vdd, the gate and drain of the second NMOS transistor are connected to the gate of the PMOS transistor, and the source of the second NMOS transistor is connected to the power supply terminal gnd.