High-precision relaxation oscillator capable of being trimmed and regulated

A relaxation oscillator, high-precision technology, applied in the direction of power oscillators, electrical components, etc., can solve the problems of oscillator output frequency value deviation, relaxation oscillator influence, etc., to achieve the effect of reducing process deviation

Active Publication Date: 2015-04-22
成都三零嘉微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regardless of the implementation method, the frequency of the relaxation oscillator is greatly affected by the characteristics of the device, so there is a problem that when the process deviation, power supply voltage and ambient temperature change, the output frequency value of the oscillator may change slightly. big deviation

Method used

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  • High-precision relaxation oscillator capable of being trimmed and regulated
  • High-precision relaxation oscillator capable of being trimmed and regulated
  • High-precision relaxation oscillator capable of being trimmed and regulated

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Embodiment Construction

[0020] A trimmable high-precision relaxation oscillator, such as figure 2 As shown, it includes an oscillation generator 100 , a high-precision current bias generator 200 , a voltage regulator 300 , and a drive and output part 400 . Among them: the oscillation generator 100 generates an oscillation waveform by charging and discharging a capacitor, the high-precision current bias generator 200 provides a bias for the constant current source in the oscillation generator, the voltage regulator 300 generates two threshold levels of the comparator, and the register Configuration modification is also included in this part, and the driving and output part 400 improves the driving capability of the oscillator waveform through an inverter chain and outputs the waveform.

[0021] The oscillation generator 100 includes four PMOS transistors 110, 111, 112, 113 (namely M1, M2, M3, M4); four NMOS transistors 120, 121, 122, 123 (namely M5, M6, M7, M8); Charge and discharge capacitor 130 (i...

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Abstract

The invention discloses a high-precision relaxation oscillator capable of being trimmed and regulated. The high-precision relaxation oscillator comprises an oscillation generator, a high-precision current bias generator, a voltage regulator and a driving and output part, wherein the high-precision current bias generator provides the bias for a constant current source in the oscillation generator, the voltage regulator generates two threshold levels for a comparator in the oscillation generator, and the oscillation generator utilizes capacitor charging and discharging to generate oscillation waveform to be provided for the driving and output part. The high-precision relaxation oscillator has the positive effects that through the realization of the high-precision bias current and the trimming and regulation of a register of the comparison threshold levels, the process deviation and the oscillator frequency change during the power supply voltage or environment temperature change can be reduced, and the value after the frequency modification can meet the designed precision requirements.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to an adjustable high-precision relaxation oscillator, which can be applied to the reference clock of the SOC system on chip. Background technique [0002] Oscillators are an essential part of many electronic systems. The relaxation oscillator, also known as the charge-discharge oscillator, works by alternately charging and discharging the capacitor between two threshold levels that have been set in the circuit. In this way, the circuit first relaxes one quasi-stable state until it reaches a certain threshold level position; then, the circuit switches and relaxes to another quasi-stable state until it reaches another threshold and then switches back to the first quasi-stable state . The process continues in this form. [0003] The basic topology of a relaxation oscillator is as figure 1 shown. Among them, S1 represents a control switch, and COMP represents a comparator includ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03B5/04
Inventor 朱翔陈新胡杨川
Owner 成都三零嘉微电子有限公司
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