Temperature compensation circuit and method

Abstract

The invention relates to a temperature compensation circuit, comprising a reference current source circuit with reference current and a first circuit; the reference current source circuit comprises a resistance circuit and a transistor, the resistance circuit comprises a negative temperature coefficient resistor, the first end of the resistance circuit receives the reference current, and at leastone part of the reference current passes through the negative temperature coefficient resistor; a path between the drain electrode of the transistor and the source electrode thereof is connected withthe transistor in series, the grid electrode of the transistor is coupled to the drain electrode of the transistor and the second end of the resistance circuit, and the rain electrode of the transistor generates a bias voltage signal; the first circuit generates an output signal in response to the bias voltage, and the temperature compensation circuit utilizes the negative temperature coefficientresistor to compensate the varying frequency of the output signal along the temperature.

Description

technical field [0001] The present application relates to a circuit and method with temperature compensation, in particular to a circuit and method with temperature compensation for compensating oscillation frequency. Background technique [0002] The internal oscillator (Internal oscillator) is usually used inside the integrated circuit (IC) to provide the system frequency, but because the components and circuits included in the internal oscillator have temperature characteristics, once the operating temperature changes, the internal oscillator will frequency changes. [0003] Ring oscillator (Ring oscillator) is usually used as an internal oscillator circuit. Since the metal oxide semiconductor (MOS) element itself has the characteristic of positive temperature coefficient change, when the temperature changes, the frequency of the ring oscillator has the following characteristics : When the temperature rises, the frequency becomes slower due to the increase of the interna...

AI Technical Summary

Problems solved by technology

[0002] The internal oscillator (Internal oscillator) is usually used inside the integrated circuit (IC) to provide the system frequency, but because the components and circuits included in the internal oscillator have temperature characteristics, once the operating temperature changes, the internal oscillator will frequency change

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