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Multi-frequency crystal oscillator circuit

A technology of crystal oscillation and oscillation circuit, applied in the direction of power oscillators, electrical components, etc., can solve the problems of large crystal oscillator circuit area, low reusability, and large power consumption, so as to reduce power consumption, realize reusability, Effect of reducing area and cost

Active Publication Date: 2017-06-06
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the disadvantages of large area, large power consumption and low reusability, the traditional crystal oscillator circuit can no longer meet the requirements of today's electronic systems. Therefore, how to design a crystal oscillator circuit with low power consumption, high stability and reusability is a high-performance Fundamental Problems Electronic Systems Need to Solve

Method used

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Embodiment Construction

[0030] figure 1 a shows the structure diagram of the Pierce oscillation circuit, in which the MOS transistor M0 is used as the amplification unit, figure 1 b is its AC equivalent circuit diagram. The multi-frequency crystal oscillating circuit adopts a Pierce oscillating circuit structure. According to the Barkhausen criterion, the conditions for circuit oscillation should be satisfied:

[0031] Z C +Z M =0 (1)

[0032] Further solving can obtain the critical transconductance:

[0033] G m =(C 1 +C2) 2 *(ωC T ) 2 / C 1 C 2 (2)

[0034] Among them, "*" represents the multiplication sign, C T =C 0 +C 1 C 2 / (C 1 +C 2 ), because the circuit needs to meet the requirements of extremely low power consumption, the device is required to work in the subthreshold region. At this time, the drain current has the following relationship with the voltage of each terminal:

[0035] I d =sI s0 e vg / nVT (e -VS / VT -e -VD / VT ) (3)

[0036] where V G , V D and V S is t...

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Abstract

The invention discloses a multiple-frequency crystal oscillation circuit comprising a numerical control circuit, an amplitude control circuit, an oscillating circuit and an amplifying circuit. The numerical control circuit is used for switching crystal oscillation parameters to meet the requirements of crystal oscillation with different frequencies; the amplitude control circuit is connected to the numerical control circuit and is used for limiting the voltage amplitude of two ends of a crystal; the oscillating circuit is connected to the numerical control circuit and the amplitude control circuit and is used for producing crystal oscillation; the amplifying circuit is connected to the oscillating circuit, is used for allowing the output voltage to implement full swing amplitude oscillation and has the duty ratio meeting the design requirements. The system power consumption can be reduced effectively, and the multiple-frequency crystal oscillation circuit can be reused.

Description

technical field [0001] The invention relates to a low power consumption multi-frequency crystal oscillation circuit. Background technique [0002] Real-time clocks are widely used in many electronic systems. As the time reference of the system, the real-time clock needs to meet the requirements of frequency stability and low power consumption. [0003] In the past few decades, crystal oscillators have been widely used as reference clock sources because of their inherent advantages. Today, with the rapid development of science and technology, electronic systems are gradually developing in the direction of portability, low power consumption, and high stability. Due to the shortcomings of large area, large power consumption, and low reusability, the traditional crystal oscillator circuit can no longer meet the requirements of today's electronic systems. Therefore, how to design a crystal oscillator circuit with low power consumption, high stability, and reusability is a high-p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03B5/04H03B5/08
Inventor 李云艳王旭杨光华
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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