Four-input terminal comparator

Abstract

The invention discloses a four-input terminal comparator which is provided with four input terminals. When the comparator is applied to a similar proposal for a plurality of batteries, only one reference source is required, thus saving chip area and cost and improving circuit performance. The technical scheme of the invention is as follows: the comparator is provided with a first MOS, a second MOS, a third MOS and a fourth MOS, wherein the grid electrodes of the first MOS and the second MOS are respectively connected with a first input voltage and a second input voltage, and the source electrodes of the first MOS and the second MOS are respectively connected with a third input voltage and a fourth input voltage; the third MOS and the fourth MOS form a current mirror structure, and the third MOS forms a diode connection mode; and the drain electrode of the third MOS is connected to the drain electrode of the first MOS, the drain electrode of the fourth MOS is connected to the drain electrode of the second MOS, and drain output is taken as output of the comparator.

Description

technical field [0001] The present invention relates to a comparator, and more particularly to a comparator having four inputs and suitable for use in a monolithic integrated circuit chip. Background technique [0002] In the field of analog integrated circuits, comparators are widely used. The comparator compares two voltages and outputs high and low level signals for subsequent circuit processing. [0003] Traditional comparators such as figure 1 As shown, the comparator is composed of the first stage and the second stage. The first stage consists of the input pair of tubes M1 and M2, the load pair of tubes M3 and M4, and the current source I b1 The second stage consists of MOS tube M5 and current source I b constitute. The comparison voltage is connected to the gates of M1 and M2 respectively, from figure 1 mid look, that is, the first input voltage V in input to the gate of M1, the second input voltage V ip Input to the gate of M2. [0004] The input comparison v...

AI Technical Summary

Problems solved by technology

[0010] This implementation has certain limitations:

[0011] (1) Each battery needs a reference voltage. As the number of batteries increases, the reference source circuit also increases, and the area and cost of the corresponding chip will increase accordingly.

[0012] (2) The mismatch of the reference source circuit between each battery (Mismatch) will introduce additional errors, which will affect the overall accuracy

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