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A CMOS voltage comparator

A technology of voltage comparator and MOS tube, which is applied in the direction of electrical components, logic circuits, generating electric pulses, etc., can solve the problems affecting the accuracy of comparators, slow conversion speed, and failure to work normally, and achieve large input dynamic range and comparison speed Fast, comparatively high-precision results

Inactive Publication Date: 2006-10-11
SHANGHAI HUAHONG INTEGRATED CIRCUIT
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the existence of the offset voltage of the op amp, it will affect the accuracy of the comparator
And because the open-loop gain of the op amp is very large, a small offset voltage may cause the circuit to saturate
thus not working properly
[0004] Due to the lack of positive feedback, the speed of the comparator is limited by the slew rate (SLEW RATE) of the op amp. Due to the use of a single-stage op amp, the switching speed is very slow, resulting in a very slow slew rate.

Method used

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  • A CMOS voltage comparator
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Embodiment Construction

[0025] The technical solution of the present invention will be further described below in conjunction with the embodiments and the accompanying drawings.

[0026] figure 2 is a structural block diagram of an embodiment of the CMOS voltage comparator of the present invention, in which two stages of amplifiers are cascaded, such as figure 2 mentioned, including:

[0027] The first amplifier 21, its first output end is connected with the first input end through a switch 26, its second output end is connected with the second input end through a switch 26, two switches are opened or closed at the same time, can be regarded as unified Operational, so marked with the same symbol in the figure;

[0028] The second amplifier 22, the input end is connected with the output end of the first amplifier 21, its first output end is connected with the first input end through a switch 26, and its second output end is connected with the second input end through a switch 26, which The two sw...

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Abstract

A CMOS voltage comparator, comprising: a multistage amplifier, the first output terminal of each stage amplifier is connected to the first input terminal through a switch, the second output terminal is connected to the second input terminal through a switch, and the two switches are connected simultaneously Open or closed; the input terminal of each stage amplifier is connected to the output terminal of the previous stage amplifier, and the switches of all amplifiers are opened or closed at the same time; double-ended input to single-ended output conversion circuit, the input terminal is connected to the output terminal of the last stage amplifier Connected; multi-stage output shaping circuit, the input end is connected to the output end of the double-ended input to single-ended output conversion circuit; the DC blocking capacitor is located before the amplifiers of all levels and the input end of the double-ended input to single-ended output conversion circuit; the first The switch, the input signal is connected to the first-stage amplifier after passing through the first switch and the DC blocking capacitor; the second switch, the input signal is grounded after passing through the second switch, and the second switch is opened or closed simultaneously with all switches of the multi-stage amplifier.

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 at 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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K19/0948H03K3/16
Inventor 陈良生
Owner SHANGHAI HUAHONG INTEGRATED CIRCUIT
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