A Sine Wave Quartz Crystal Oscillator Based on Analog Circuit
A quartz crystal, analog circuit technology, applied in power oscillators, electrical components, automatic power control and other directions, can solve the problems of large circuit volume and power consumption, high hardware requirements, complex algorithms, etc., to avoid influence and small size , easy to achieve effect
Active Publication Date: 2016-05-04
BEIJING RES INST OF TELEMETRY +1
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Problems solved by technology
The patent US5487015A proposes a quartz crystal oscillator based on digital signal processing. The main disadvantages of this solution are complex algorithms, high hardware requirements, large circuit volume and power consumption. In addition, the sine wave generated by it is obtained by low-pass filtering of ladder waves. , still has a large number of harmonic components
Patent US5047734 proposes a sine wave crystal oscillator based on an analog multiplier, but this solution still has the disadvantages of complex circuit, high power consumption, and large volume
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[0025] The sine wave quartz crystal oscillator based on an analog circuit according to the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
[0026] figure 1 A quartz crystal 1 and its circuit equivalent model 2 are shown. One branch of the equivalent model diagram of the circuit is represented by the dynamic resistance R 1 , dynamic capacitance C 1 , dynamic inductance L 1 connected in series is called a series branch. where the dynamic capacitance C 1 and dynamic inductance L 1Determined by the size, density, piezoelectric constant and elastic constant of the quartz crystal, the dynamic resistance R 1 It reflects the size of the mechanical loss of the quartz crystal. Bypass capacitor C 0 In parallel with the series branch, it is the electrostatic capacitance between the quartz crystal electrodes. The present invention is applicable to all quartz crystal oscillators that can be equivalent to t...
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The invention relates to a sine-wave quartz crystal oscillator based on an analog circuit. The oscillator is composed of a frequency loop and an amplitude loop. The frequency loop comprises a quartz crystal, a current amplifier and an adjustable voltage amplifier, and is satisfied with a start-oscillation condition with the loop phase as 2npi (n is an integer) to realize control on the frequency of the oscillator. The amplitude loop comprises an amplitude detector, an integrator and a controlled current source; the amplitude loop, on one hand, enables the loop gain of the frequency loop at the start-oscillation stage to be far greater than 1, and accordingly shortens the start-oscillation time, on the other hand, enables the loop gain of the frequency loop to be equal to 1 after the start-oscillation and works in a sine-wave state. A driving signal of the quartz crystal oscillator is a sine wave, so that influence from higher harmonics of square waves to the quartz crystal and adjacent oscillation circuits is avoided. The sine-wave quartz crystal oscillator based on the analog circuit has the advantages of a simple structure, low power consumption and easy implementation, and can avoid interference from a clock signal in a digital circuit.
Description
technical field [0001] The invention relates to a quartz crystal oscillator, in particular to a sine wave quartz crystal oscillator based on an analog circuit. Background technique [0002] Quartz crystal oscillators can be applied to various sensors such as angular rate, angular acceleration, pressure, temperature, etc., with high quality factor, good frequency stability, good repeatability, small hysteresis, good time stability, corrosion resistance and radiation resistance, and manufacturability Good, low cost, suitable for mass production and other advantages. [0003] Previously, there were US5487015A and US5047734A patents on sine wave crystal oscillators. The patent US5487015A proposes a quartz crystal oscillator based on digital signal processing. The main disadvantages of this solution are complex algorithms, high hardware requirements, large circuit volume and power consumption. In addition, the sine wave generated by it is obtained by low-pass filtering of ladder...
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IPC IPC(8): H03B5/38H03L5/00
Inventor 王健金小锋杨丹邹江波孙延东陈倩陶晋路文一
Owner BEIJING RES INST OF TELEMETRY