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Oscillator Circuit

A technology of oscillating circuits and vibrators, applied in power oscillators, electrical components, etc., can solve the problems of reduced negative resistance of the circuit part 203, large installation area, reduced oscillation tolerance, etc., and achieves a good frequency variable range Effect

Inactive Publication Date: 2014-09-10
NIHON DEMPA KOGYO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the inductance value of the inductor 209 is increased, there is a problem that a large mounting area is required and the frequency variable range changes.
[0013] Image 6 In the oscillation circuit 600, if the voltage applied to the variable capacitance element 238 is changed to change the capacitance of the variable capacitance element 238, the negative resistance of the circuit part 203 will decrease, and the oscillation margin will decrease. reduced problem

Method used

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  • Oscillator Circuit
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Examples

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no. 1 approach

[0045] [Circuit Configuration of Oscillation Circuit 100 ]

[0046] figure 1 A configuration example of the oscillation circuit 100 of the first embodiment is shown.

[0047] Oscillation circuit 100 includes crystal resonator 1 , variable capacitance element 2 , circuit unit 3 , capacitor 4 , capacitor 5 , capacitor 6 and capacitor 7 connected in parallel, resistor 8 , and inductor 9 .

[0048] The crystal resonator 1 is, for example, a crystal resonator using an AT-cut crystal. A first terminal of crystal resonator 1 is connected to variable capacitance element 2 via capacitor 6 , capacitor 7 , and inductor 9 . The second terminal of crystal resonator 1 is connected to circuit unit 3 .

[0049] The variable capacitance element 2 is, for example, a varicap diode. The variable capacitance element 2 is provided between the first terminal of the crystal oscillator 1 and the ground. The variable capacitance element 2 changes in impedance according to the control voltage VC1 ...

no. 2 approach

[0064] figure 2 A configuration example of the oscillation circuit 200 of the second embodiment is shown. The oscillator circuit 200 according to the second embodiment includes a capacitor 41, a variable capacitance element 42, a capacitor 43, a resistor 44, and a resistor 45 between the collector and the emitter of the transistor 31, and is similar in this respect to figure 1 The oscillator circuit 100 shown is different but otherwise the same.

[0065] In the second embodiment, one end of the capacitor 41 is connected to the collector of the transistor 31 , and the other end is connected to the variable capacitance element 42 . One end of the variable capacitance element 42 is connected to the capacitor 41 , and the other end is connected to the capacitor 43 . One end of the capacitor 43 is connected to the variable capacitance element 42 , and the other end is connected to the emitter of the transistor 31 . That is, in the oscillation circuit 200 , the capacitor 41 , t...

no. 3 approach

[0070] image 3 A configuration example of the oscillation circuit 300 of the third embodiment is shown. The oscillation circuit 300 of the third embodiment includes: figure 2 The capacitor 46 provided in parallel with the variable capacitance element 42 of the oscillation circuit 200 shown is, in this respect, the same as figure 2 The oscillator circuit 200 shown is different. Furthermore, the control voltage VC1 applied to the variable capacitance element 2 is applied to the variable capacitance element 42 .

[0071] In the oscillation circuit 300 , the capacitor 46 and the variable capacitance element 42 are connected in parallel between the collector and the emitter of the transistor 31 . The capacitor 46 is provided in parallel with the variable capacitance element 42 , whereby the amount of change in the capacitance value between the collector and the emitter of the transistor 31 decreases with respect to the amount of change in the control voltage VC1 . That is, t...

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Abstract

An oscillator circuit is provided. The oscillator circuit (100) includes a crystal oscillator (1); a first variable capacitance element (2) that is disposed between the first terminal of the crystal oscillator (2) and the ground, a transistor (31) and that changes the capacitance value according to control of a control voltage (VC); a transistor (31) the base electrode of which is connected to the second terminal of the crystal oscillator (1); and a capacitor (4) disposed between the emitter and the collector of the transistor (31). The oscillator circuit allows the oscillation frequency to be changeable and well maintains the changing range of the frequency.

Description

technical field [0001] The invention relates to an oscillator circuit. Background technique [0002] Conventionally, an oscillation circuit capable of adjusting the oscillation frequency is known (for example, refer to Patent Document 1). Figure 5 A configuration example of a conventional oscillation circuit 500 is shown. The oscillator circuit 500 includes a vibrator 201 , a variable capacitance element 202 , a circuit unit 203 , a capacitor 204 , a capacitor 206 , a capacitor 207 , a resistor 208 , and an inductor 209 . [0003] One end of the vibrator 201 is connected to the variable capacitance element 202 via an inductor 209 , a capacitor 206 , and a capacitor 207 , and the other end is connected to the circuit unit 203 of the oscillation section. The variable capacitance element 202 is provided between the capacitor 206 and the capacitor 207 and the ground. The circuit unit 203 constitutes a Colpitts type oscillation circuit by being connected to the oscillator 201 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/04
CPCH03B2200/004H03B2201/0208H03B5/362H03B2200/0008H03B5/368
Inventor 福田実
Owner NIHON DEMPA KOGYO CO LTD
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