Adjustable high-frequency oscillator CMOS (Complementary Metal-Oxide-Semiconductor Transistor) circuit with adjustable precision and adjusting method

Abstract

According to the adjustable high-frequency oscillator CMOS circuit capable of adjusting the precision and the adjusting method provided by the invention, the whole circuit adopts a CMOS process, and the circuit carries out trimming and linear adjustment on the output frequency of a chip through the design of a current source part, a ring oscillator VCO part, a voltage comparison part, an OSC precision and frequency adjustment part and a logic control part; stable and accurate high-frequency switching signals are generated, the power consumption is low, and the size is small. The switching frequency of the oscillator is flexible and adjustable, the linearity in the adjusting range is good, and the precision of the output frequency of the oscillator is adjusted.

Description

technical field [0001] The invention relates to the technical field of circuits, in particular to an adjustable high-frequency oscillator CMOS circuit. Background technique [0002] With the continuous development of electronic technology and the advent of the 5G era, the application range and application scenarios of various chips continue to expand, the chip size is miniaturized, and the integration level is continuously improved. role is becoming more and more important. Among the traditional CMOS oscillators, the LC oscillator is not conducive to reducing the chip size due to the use of components such as capacitors and inductors, and the output frequency adjustment range is small, so the application range is limited. The CMOS ring oscillator has the advantages of wide adjustment range, low power consumption, small area and high integration, but because the frequency of the ring oscillator is related to the delay time of all levels of circuits and the magnitude of the c...

AI Technical Summary

Problems solved by technology

Among the traditional CMOS oscillators, the LC oscillator is not conducive to reducing the chip size due to the use of components such as capacitors and inductors, and the output frequency adjustment range is small, so the application range is limited

The CMOS ring oscillator has the advantages of wide adjustment range, low power consumption, small area and high integration, but because the frequency of the ring oscillator is related to the delay time of all levels of circuits and the magnitude of the charge and discharge current, it cannot reach a higher output frequency. Moreover, in the CMOS process, the MOS tube is greatly affected by factors such as process, power supply voltage and temperature, and there are errors in the chip processing process, which limits the output accuracy of the ring oscillator.

Compared with LC oscillators, ring oscillators have disadvantages such as lower output frequency, poor circuit stability, and insufficient output accuracy.

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