Window voltage comparison device

Abstract

A window voltage comparison device comprises a sequential circuit, a voltage comparison circuit and a logic processing circuit. The sequential circuit performs frequency demultiplication on an input clock signal clk to obtain a second clock signal and a third clock signal and outputs the second clock signal and the third clock signal to the voltage comparison circuit; the voltage comparison circuit comprises a selector and a comparator, and the selector outputs a lower threshold voltage limit or an upper threshold voltage limit according to the control of the second clock signal and the third clock signal; the comparator compares the lower threshold voltage limit or the upper threshold voltage limit output by the selector with a voltage to be detected and outputs comparison results to the logic processing circuit; and the logic processing circuit performs logic processing on the comparison results output by the voltage comparison circuit according to triggering of the input clock signal clk and outputs processing results. The window voltage comparison device has the advantages of being small in occupied circuit area, good in consistency and low in static current.

Description

technical field

[0001] The invention relates to a voltage comparison detection device, in particular to a window voltage comparison device. Background technique

[0002] In integrated circuit design, especially when it comes to automatic gain control circuits, it is often necessary to judge whether the voltage of the signal falls within a certain voltage range, which requires the use of a voltage comparison detection circuit.

[0003] The commonly used voltage comparison detection circuit is a window voltage comparator, as shown in Figure 1, which includes a first comparator Comp1, a second comparator Comp2 and an exclusive OR gate XOR, and the voltage vin to be detected is input into the first comparator Comp1 and the second comparator respectively. The positive input terminal of the second comparator Comp2; the negative input terminal of the first comparator Comp1 inputs the lower limit threshold voltage vth1, the negative input terminal of the second comparator Comp2 inpu...

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