A CMOS voltage comparator

A voltage comparator, MOS tube technology, applied in electrical components, logic circuits, generating electrical pulses, etc., can solve problems such as slow conversion speed, affect the accuracy of the comparator, and cannot work normally, and achieve fast comparison speed and input dynamic range. Large, comparatively high-precision effects
CN1567723AInactive Publication Date: 2005-01-19SHANGHAI HUAHONG INTEGRATED CIRCUIT
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI HUAHONG INTEGRATED CIRCUIT
Publication Date
2005-01-19
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention is a CMOS voltage comparer, a multistage amplifier, where, for each one, the first output end is connected with the first input end by a switch and the second output end connected with the second input end by a switch, the two switches are opened or closed at the same time; the input end of each amplifier is connected with the output end of the previous amplifier and the switches of all the amplifiers are opened or closed at the same time; a double-arrival single-converting circuit with two input ends connected with two output ends of the last amplifier; a multistage output reshaping circuit, where one input end is connected with one output end of the double-arrival single-converting circuit; DC isolating capacitors, situated in front of the input ends of all the amplifiers and the double-arrival single-converting circuit; a first switch, where an input signal is connected to the primary amplifier through the first switch and then an DC isolating capacitor; a second switch, where the other input signal is grounded through the second switch and the second switch and all the switches of the multistage amplifier are opened or closed at the same time.
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Description

technical field

[0001] The invention relates to a voltage comparator, in particular to a CMOS voltage comparator composed of multi-level circuits. Background technique

[0002] In the traditional comparator in the integrated circuit, the operational amplifier is usually used as the comparator, and the comparison function is realized by utilizing the characteristic of the large open-loop gain of the operational amplifier. If the input voltage of the positive terminal is higher than that of the negative terminal, the output will be a high level; if the input voltage of the positive terminal is lower than that of the negative terminal, a low level will be output. In this way, the comparison of the input voltage of the positive and negative input terminals is realized. The functional block diagram and working principle diagram of the circuit are shown in figure 1 as shown, figure 1 (a) is a functional block diagram, figure 1 (b) is the working principle diagram, in which the...

Claims

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