Method and device for compensating for resistance process deviation, resistors and RC oscillators

Abstract

The invention is suitable for the field of integrated circuits, and provides a method and a device for compensating for a resistance process deviation, zero-temperature-coefficient resistors and RC oscillators. The method comprises the following steps: generating a first RC oscillation signal and a second RC oscillation signal; generating a count value according to the first RC oscillation signal and the second RC oscillation signal, wherein the count value comprises resistance process deviation information; computing a resistance process deviation value according to the count value; and compensating for the resistors according to the resistance process deviation value in order that the resistors have zero temperature coefficients. A clock of one RC oscillator is used for counting a clock of another RC oscillator, the resistance process deviation value is computed through a computing unit by using the count value reflecting relative process deviation information between the resistors having reverse temperature coefficients, and a resistor of a third RC oscillator is compensated by using the resistance process deviation value, so that the resistor of the third RC oscillator is changed into the zero-temperature-coefficient resistor reliably and effectively, and the temperature compensating aim is fulfilled.

Description

technical field [0001] The invention belongs to the field of integrated circuits, and in particular relates to a compensation method and device for resistance process deviation, a resistance with zero temperature coefficient and an RC oscillator with temperature compensation characteristics. Background technique [0002] Digital circuits in digital-analog mixed-signal chips usually require a clock signal with precise frequency, and the clock signal is generated by an oscillator inside the chip. RC oscillator has simple structure, high integration and good performance, so it has been widely researched and applied. [0003] In a conventional RC oscillator, it operates by charging or discharging a capacitor through a resistor-controlled current system. When the voltage on the capacitor reaches the upper limit (or higher than a certain threshold), the switching device starts to discharge the capacitor; when the voltage on the capacitor reaches the lower limit (or is lower than ...

AI Technical Summary

Problems solved by technology

[0013] The purpose of the embodiments of the present invention is to provide a compensation method for resistance process deviation, aiming at solving the current resistance deviation caused by process dispersion in integrated circuits, which affects the performance of its application circuit, especially the problem of affecting clock accuracy

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