A low temperature drift delay circuit

Abstract

The invention discloses a low-temperature drift delay circuit. The circuit includes: a bias current source circuit, a slope voltage generating circuit and a fixed threshold switch circuit; the bias current source circuit is used to generate a negative temperature coefficient current bias, Its input terminal is connected to the power supply voltage, and its output terminal is connected to the slope voltage generating circuit; the bias input terminal of the slope voltage generating circuit is connected to the output terminal of the bias current source circuit, and its digital signal input terminal is connected to the digital signal input , the output terminal of which is connected to the fixed threshold switch circuit; the input terminal of the pull-down switch of the fixed threshold switch circuit is connected to the output terminal of the slope voltage generating circuit, the input terminal of the pull-up switch is connected to the digital signal input, and the output terminal of the fixed threshold switch circuit is delayed subsequent digital signals. The invention can perform time-delay processing on digital signals without being affected by temperature and power supply voltage; the fixed threshold switch circuit adopts a thyristor structure as a pull-down switch, and has the advantages of stable threshold value, high speed, simple structure and the like.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, and in particular relates to a low-temperature drift delay circuit. Background technique [0002] As all kinds of electrical appliances have higher and higher requirements for switching power supply chips, the design of switching power supply chip has higher and higher requirements for the oscillator inside the chip. The impact of the operating frequency of a switching power supply chip on chip performance involves parameters such as ripple, loop stability, and maximum load, and even indirectly affects the chip's input voltage range and small signal response speed. Due to the different thermal power generated by the chip under different loads and the temperature change of the environment, the chip works at different temperatures, and the different temperature characteristics of the devices under different processes make the output frequency of the oscillator also affected by te...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects and improvement needs of the prior art, the present invention provides a low-temperature drift delay circuit, the purpose of which is to solve the problem that the single-stage delay of the on-chip integrated oscillator is affected when the temperature and power supply voltage change

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