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Temperature-compensating method for quartz crystal oscillator

A technology of quartz crystal and temperature compensation, which is applied in the electronic field, can solve the problems of narrow series-parallel frequency interval, reduce volume multiplication times, and reduce frequency stability index, etc., and achieve the effect of suitable integration and overcoming phase jitter

Inactive Publication Date: 2009-03-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

When compensating the high-frequency overtone crystal oscillator, because the series-parallel frequency interval is narrow (Δf / n 2 ) and need to add inductance to expand the series-parallel frequency, or use methods such as frequency doubling, which will result in lower frequency stability indicators and large phase noise
However, the current development of electronic technology requires reducing the size, reducing power consumption, and reducing the number of frequency multiplications, which has brought about the trend of high-frequency development; the existing compensation methods cannot meet the needs of high-frequency development trends

Method used

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  • Temperature-compensating method for quartz crystal oscillator
  • Temperature-compensating method for quartz crystal oscillator

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Embodiment Construction

[0039] According to the method of the present invention, we form a kind of 100MHz, 5 overtone temperature compensated crystal oscillators, its schematic diagram is as Figure 4 shown.

[0040] exist Figure 4 middle,

[0041] The quartz crystal oscillator is composed of R1, R2, R3, R4, C1, C2, C3, C4, NPN transistor, 5th overtone quartz crystal with a natural frequency of 100MHz, +5V power supply and other devices;

[0042] The mixer is composed of two diodes DIODE, two transformers TRANS3 and other devices;

[0043] The filter is composed of C5, C6, 5th overtone quartz crystal with a natural frequency of 100MHz;

[0044] The whole wave circuit is composed of C7, C8, C9, INDUCTOR1, INDUCTOR2, INDUCTOR3 and other devices;

[0045] Compensation frequency generation circuit is constituted by ADμ814; among them, ADμ814 is a microprocessor with a temperature sensor, which can generate a compensation frequency signal through software programming.

[0046] The value range of the...

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Abstract

A temperature compensation method for quartz crystal oscillator, the temperature sensor and compensation frequency generation circuit producing a compensation frequency signal having equal absolute value and opposite sign with the deviation frequency value produced by uncompensated quartz crystal oscillator, said compensation frequency signal mixed and outputted with the uncompensated frequency signal after wave shaping, obtaining compensated frequency signal after filtering by filter, said invention has low phase noise and can make effective temperature compensation to high frequency overtone quartz crystal oscillator.

Description

technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to the temperature compensation technology of a quartz crystal oscillator. Background technique [0002] At present, there are mainly analog methods for temperature compensation of quartz crystal oscillators (thermistor network controls varactor diodes such as figure 1 ) and microcomputer compensation, of which the analog type is basically mature, and its shortcoming is that the productivity is too poor. Microcomputer temperature compensated crystal oscillator (such as figure 2 The method shown) is to output the compensation voltage through the microprocessor, and then send the compensation voltage to the varactor device in the oscillation circuit. When the compensation voltage changes, the capacitance value of the varactor device will change accordingly to change the output frequency of the oscillator. To achieve the purpose of frequency control. Both of these m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03B5/04H03B5/32
Inventor 黄显核黎敏强付玮谭锋
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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