JPH07170125A - Oscillator - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object of the present invention to improve the man-hours by making it possible to lower the frequency when adjusting the frequency in the oscillator used for communication equipment. A land pattern 6 connected to the connection pattern 3 is provided, and the land pattern 6 is surrounded by a ground pattern 7 and solder is attached to the land pattern 6. With this configuration, by attaching the solder to the land pattern 6, the stray capacitance between the land pattern 6 and the ground pattern 7 is increased, and the frequency of the resonance system can be lowered, so that readjustment can be easily performed even when the frequency is set too high. This can improve the man-hours.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oscillator used for communication equipment.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing a conventional oscillator. The structure of a conventional oscillator will be described below with reference to the drawings. A capacitor 2 was connected to the oscillator circuit 1, and the capacitor 2 and the lead terminal 4 were connected via a connection pattern 3. The coaxial dielectric resonator 5 was connected to the lead terminal 4. Further, the output terminal 10 was connected to the output of the oscillation circuit 1.

Regarding the oscillator configured as described above,
The operation will be described below. The equivalent circuit of the coaxial dielectric resonator 5 has a configuration in which a capacitor 5a and an inductor 5b are connected in parallel as shown in FIG. The lead terminal 4 is also represented by an inductor 4a in the equivalent circuit. Furthermore, the lead terminal 4 of the coaxial dielectric resonator 5 and the capacitor 2 are connected in series to form a resonance system, which determines the frequency of the oscillation circuit 1. The signal of the determined frequency is output from the output terminal 10. The frequency adjustment of the resonance system is performed by cutting the electrode portion of the coaxial dielectric resonator 5 to make the inductor equivalently small. As another method, the frequency is adjusted by attaching solder to the connection pattern 3 and making the inductor 4a of the lead terminal 4 equivalently small.

[0004]

However, in such a conventional configuration, when the frequency is adjusted by cutting the electrode portion, the inductor 5b is simply made smaller, and therefore the adjustment can only be made higher. . Therefore, if the electrode is cut too much, readjustment becomes impossible. Similarly, when the frequency is adjusted by attaching the solder, the adjustment is performed to reduce the inductor 4a and increase the frequency. If the solder is attached too much, the solder needs to be deleted, which complicates the work. There was a problem.

The present invention solves such a problem and makes it possible to lower the frequency when adjusting the frequency, thereby improving workability.

[0006]

In order to achieve this object, the oscillator of the present invention is provided with a land pattern connected to a connection pattern, and the land pattern is surrounded by a ground pattern.

[0007]

With this structure, by attaching solder to the land pattern, the stray capacitance between the land pattern and the ground pattern is increased, and the frequency of the resonance system can be lowered. Therefore, even if the frequency is set too high, the frequency can be easily lowered by attaching the solder to the land pattern. Therefore, readjustment can be facilitated and workability is improved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an oscillator according to an embodiment of the present invention. FIG. 2 is a perspective view showing a mounted state of the coaxial dielectric resonator. FIG. 3 is a sectional view showing a coaxial dielectric resonator mounted. Figure 4
FIG. 3 is a perspective view showing a land pattern and an earth pattern.

The same blocks as in FIG. 5 shown in the conventional example are designated by the same reference numerals. As shown in FIGS. 1, 2 and 3, the oscillation circuit 1 is mounted on a printed circuit board 9, and a connection pattern 3 is formed on the oscillation circuit 1 via a capacitor 2.
Are connected. The coaxial dielectric resonator 5 with the lead terminal 4 mounted on the printed circuit board 9 is the lead terminal 4
It is connected to the connection pattern 3 via. The output of the oscillation circuit 1 is connected to the output terminal 10. Further, as shown in FIG. 3, a land pattern 6 connected to the connection pattern 3 is provided under a printed board 9 through a through hole 8, and the land pattern 6 is surrounded by an earth pattern 7 as shown in FIG. The solder is attached to the land pattern 6 to adjust the oscillation frequency. Further, a land pattern 6 is provided on the back side surface of the printed circuit board 9 from the connection pattern 3 provided on the front side surface of the printed circuit board 9 through a through hole 8, and a plurality of land patterns 6 are further provided. In this embodiment, as shown in FIG. 4, two land patterns (about 1.5 mm × 1.5 mm) 6 a and 6 b are provided in series with the land pattern 6.

Regarding the oscillator configured as described above,
The operation will be described below. The equivalent circuit of the coaxial dielectric resonator 5 has a configuration in which a capacitor 5a and an inductor 5b are connected in parallel as shown in FIG. The lead terminal 4 is also represented by an inductor 4a in the equivalent circuit. Further, the lead terminal 4 and the capacitor 2 are connected in series to the coaxial dielectric resonator 5, and these constitute one resonance system, which determines the frequency of the oscillation circuit 1. The frequency adjustment of this resonance system is performed by cutting the electrode portion of the coaxial dielectric resonator 5 to equivalently reduce the size of the inductor. Alternatively, the frequency is adjusted by attaching solder to the connection pattern 3 and making the inductor of the lead terminal 4 equivalently small.

If the frequency becomes too high, solder is attached to the land pattern 6 to increase the stray capacitance between the land pattern 6 and the ground pattern 7, and to adjust the frequency of the resonance system to be low. Therefore, even if the frequency is set too high, the readjustment can be easily performed.

[0012]

As described above, according to the present invention, the land pattern connected to the connection pattern is provided, the periphery of the land pattern is surrounded by the earth pattern, and the solder is attached to the land pattern. By attaching solder to the land pattern, stray capacitance with the ground pattern can be increased and the frequency of the resonance system can be lowered, and as a result, readjustment can be easily performed even if the frequency is set too high. This has the effect of improving man-hours.

Further, the present invention is not limited to fixed oscillators,
The effect is that it can also be applied to a voltage controlled oscillator using a coaxial dielectric.

[Brief description of drawings]

FIG. 1 is a block diagram of an oscillator according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a mounted state of a coaxial dielectric resonator according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of an essential part on which a coaxial dielectric resonator according to an embodiment of the present invention is mounted.

FIG. 4 is a perspective view showing a land pattern and an earth pattern in one embodiment of the present invention.

FIG. 5 is a block diagram of a conventional oscillator.

[Explanation of symbols]

 1 Oscillation Circuit 3 Connection Pattern 4 Lead Terminal 5 Coaxial Dielectric Resonator 6 Land Pattern 7 Ground Pattern 8 Through Hole 9 Printed Circuit Board 10 Output Terminal

Claims (3)

[Claims] 1. A printed circuit board on which an oscillator circuit is mounted,
A coaxial dielectric resonator with lead terminals mounted on the printed circuit board and connected to the oscillation circuit with a connection pattern, and an output terminal to which the output of the oscillation circuit is connected, the connection pattern An oscillator in which a connected land pattern is provided, and the land pattern is surrounded by an earth pattern. 2. The oscillator according to claim 1, wherein a land pattern is provided on a back side surface of the printed circuit board through a through hole from a connection pattern provided on a front side surface of the printed circuit board. 3. A plurality of land patterns are provided.
The described oscillator.