Unilateral hysteresis comparator

Abstract

The invention discloses one single retard comparer, which is of low voltage and power consumption chips protection circuit or circuit special design, wherein, it has the circuit current power, two input MOS tubes, three load MOS tubes and retard adjusters, wherein, the retard adjuster is to adjust comparer valve value composed of load MOS tube, feedback MOS tube and switch; the circuit single valve value is irrelative to the circuit parts.

Description

technical field [0001] The invention belongs to the field of analog integrated circuits, and relates to a single-sided hysteresis comparator, which is especially suitable for use in integrated circuit chips. Background technique [0002] In the application field of integrated chips, in order to ensure the reliability of the chip under normal and abnormal use conditions, the control circuit should include protection and detection circuits. The protection circuit has two functions of self protection and load protection. Once a fault occurs, the chip circuit will stop working immediately. The detection circuit is to detect different working states of the circuit, so that the chip can respond appropriately to different working states. [0003] A traditional hysteretic comparator with internal positive feedback is shown in Figure 1. It is a comparator that uses internal positive feedback to implement hysteresis at the input stage of a high-gain open-loop comparator. The compar...

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Problems solved by technology

[0005] Since the four tubes of this comparator are symmetrical in pairs, that is, the width-to-length ratios of P1 and P2 tubes are the same, and the width-to-length ratios of P3 and P4 tubes are the same, the threshold voltage of the comparator is symmetrically distributed for the input reference voltage. In practice, especially under low voltage and low power consumption conditions, the threshold voltage of the comparator may not necessarily be symmetrical to the reference voltage

Secondly, the positive and negative thresholds of the comparator shown in Figure 1 are related to the aspect ratio of the device and are affected by the process and temperature. In practice, the positive / negative thresholds of the comparator may be required to be exactly the same as the reference voltage, and Has a certain hysteresis effect

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