High-precision wide-range relaxation oscillator insensitive to temperature

Abstract

The invention discloses a high-precision wide-range relaxation oscillator insensitive to temperature. The relaxation oscillator comprises a bias voltage module (101), a reference current module (102),a programmable current mirror (103), a relaxation oscillator unit (104) and a shaping logic module (105). A programmable charging and discharging current is provided for the relaxation oscillator unit through a bias voltage (101), the reference current module (102) and theprogrammable current mirror (103), and the wide-range frequency characteristic of multi-band output is achieved; coarse adjustment and fine adjustment of the output frequency of each frequency band are realized through frequency adjustment and temperature compensation technologies in the reference current (102), and a high-precision output clock is generated; meanwhile, the positive temperature coefficient characteristic of the resistor and the negative temperature coefficient characteristic of the triode are utilized toachieve the good temperature drift characteristic that the output frequency of the oscillator is insensitive to the temperature in a full temperature range; and the shaping logic module (105) performs comparison, frequency multiplication and feedback control of charging and discharging of a capacitor on the output waveform of the relaxation oscillator unit, and finally outputs a clock signal witha target frequency. The relaxation oscillator provided by the utility model has the characteristics of the wide output frequency range, high precision and insensitivity to temperature.

Description

technical field [0001] The present invention mainly relates to the field of high-performance clock design, in particular to a high-precision wide-range relaxation oscillator structure that is not sensitive to temperature. The negative temperature characteristic of the triode is compensated for the temperature drift coefficient, which makes it possible to generate a high-precision wide-range clock that is not sensitive to temperature. Background technique [0002] Oscillators are an important part of many electronic systems, from clock generation in microprocessors to carrier synthesis in cellular phones, oscillators are ubiquitous, and in different applications, the requirements for the structure and performance parameters of oscillators vary widely. big difference. Oscillators are generally classified into relaxation oscillators (also known as RC oscillators), inductor capacitor oscillators, crystal oscillators, tuning fork oscillators, etc. The relaxation oscillator is t...

AI Technical Summary

Problems solved by technology

Since polysilicon resistance varies by ±10% with temperature, voltage, and process angle, and MOS capacitance varies by more than ±10% with voltage, temperature, and process angle, and delay changes introduced by inverters, buffers, etc. eventually lead to output Clock CLK frequency may have ±20% deviation

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