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Self-oscillation circuit

A technology of self-excited oscillation and oscillating circuit, applied to power oscillators, electrical components, etc., can solve the problems of reducing drive current, unrecorded, etc., and achieve the effect of improving frequency characteristics

Inactive Publication Date: 2014-05-21
NIHON DEMPA KOGYO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this cited document 2, there is no description of a technique for reducing the driving current and obtaining a stable oscillation frequency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0106] (experiment)

[0107] The temperature characteristics of the oscillation frequency of a self-excited oscillation circuit provided with a crystal oscillator 5 in an oscillation circuit and a conventional crystal oscillation circuit were compared.

[0108] A. Experimental conditions

[0109] (Embodiment) The oscillating part 1 is constituted by an inductance-capacitance oscillating circuit, and a crystal oscillator 5 is provided in the oscillating circuit. figure 1 The self-excited oscillation circuit oscillates under the temperature condition of -30℃~+85℃ to measure the frequency temperature characteristic. The oscillation frequency of the oscillation unit 1 is 26.0 MHz, the driving current is 0.26 mA, and the crystal oscillator 5 uses an AT cut and has a resonance frequency of 26.0 MHz. The load capacitance component on the active circuit side (circuit side including oscillator unit 1 , bleed resistor 31 , bleed resistor 32 , voltage dividing capacitor 23 , and volta...

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PUM

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Abstract

The invention provides a self-oscillation circuit, which comprises an oscillating unit (1), an amplifying unit (3), and a resonator (5). The oscillating unit is configured to self-oscillate. The amplifying unit is configured to amplify a frequency signal oscillated at the oscillating unit and to feed back the amplified frequency signal to the oscillating unit. The resonator is disposed in an oscillation loop that includes the oscillating unit and the amplifying unit. The resonator has a resonant frequency near an oscillation frequency of the oscillating unit and has a higher Q-value than a Q-value of the oscillating unit. For example, the Q-value of the resonator is 10 or more times the Q-value of the oscillating unit. The self-oscillation circuit provided by the invention is small in drive current and stable in frequency signals.

Description

technical field [0001] The present invention relates to a self-excited oscillation circuit having an oscillation unit that performs self-excited oscillation. Background technique [0002] Oscillating circuits equipped with crystal resonators are widely used in information and communication fields, and require further miniaturization, power saving, and high frequency stability. In general, it is known that the upper limit of the driving current (withstand driving current) at which the crystal oscillator can operate stably decreases as the size of the crystal oscillator becomes smaller. On the other hand, there are also cases where it is difficult to make the drive current for oscillating the crystal oscillator smaller than the withstand drive current in consideration of the stability of the oscillation frequency against electronic noise or temperature changes. [0003] For example, Cited Document 1 describes a technique in which a sensing object in a liquid is adsorbed to an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/20
CPCH03B5/362H03B5/326H03B2201/02
Inventor 小山光明武藤猛石川学
Owner NIHON DEMPA KOGYO CO LTD