Retarding comparator circuit of single terminal input

Abstract

The invention discloses a single-input hysteresis comparator circuit, comprising threshold voltage generating loop to generate threshold voltage and positive feedback branch to generate hysteresis voltage, where the positive feedback branch is composed of current source I3 and switch SW connected in series; the threshold voltage generating loop comprises PMOS tubes P1 and P2, NMOS tubes N3 and N4, and current sources I1 and I2; grid of the PMOS tube P1 is used as input end, drain of the PMOS tube P1 is earthed and source of the PMOS tube P1 is connected with source of the NMOS tube N3 and connected to the switch SW and the other end of the switch SW is connected with output end of the current source I3; grid and drain of the NMOS tube N3 are interconnected to grid of the NMOS tube N4 and output end of the current source I1; drain of the NMOS tube N4 is connected with output end of the current source I2, and source of the NMOS tube N4 is connected with that of the PMOS tube P2; grid and drain of the PMOS tube P2 are earthed; input ends of the current sources I1, I2 and I3 are all connected with power supply VDD. And it is designed to detect whether some voltage in a chip is over low,and it has only one input end to input a voltage to be detected.

Description

technical field [0001] The invention belongs to the field of analog integrated circuits, in particular to a hysteresis comparator circuit with single-end input, which is a hysteresis comparison circuit with single-end input and self-generated comparison threshold voltage, and is especially suitable for hysteresis comparators in integrated circuits. Background technique [0002] In the application field of integrated circuit chips, there are often restrictions on the highest and lowest potentials for a certain input or output voltage of the chip, and accordingly it is necessary to design a circuit in the chip to detect this voltage. Once the voltage is too high or too low, a certain signal is output to protect or shut down the chip. [0003] The implementation method of the detection circuit is to use a suitable comparison circuit, and since the output signal of the detection circuit needs to control the chip to a certain extent, the use of a simple comparison circuit will ca...

AI Technical Summary

Problems solved by technology

Such a comparison circuit will occupy a large area on the chip, and the circuit performance will also be affected by the reference level V REF and bias voltage V BIAS The impact of fluctuations

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