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Comparator circuit framework for improving low voltage output

A technology of comparator circuit and output stage circuit, which is applied in the direction of multiple input and output pulse circuits, etc., and can solve the problems that the comparator cannot work normally and the state cannot be determined.

Inactive Publication Date: 2011-07-06
HOLTEK SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] A known comparator is usually composed of a bias circuit, an input differential stage and an output stage. When the initial value of the power supply voltage starts to climb from 0V, the bias circuit at the front end of the comparator fails to work normally, which in turn causes the comparator It also cannot work normally, causing the output voltage of the comparator to present an unpredictable signal (Unknown) state. When the application circuit needs to use the output state of the comparator for setting judgment, the state cannot be determined.

Method used

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  • Comparator circuit framework for improving low voltage output
  • Comparator circuit framework for improving low voltage output
  • Comparator circuit framework for improving low voltage output

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Embodiment Construction

[0035] The detailed structure and connection relationship of the present invention will now be described with the following drawings.

[0036] In order to enable the comparator to still output a voltage level when the power supply voltage does not reach the minimum operating voltage of the comparator bias circuit, the present invention adds two additional stages between the input differential pair circuit and the output stage circuit of the comparator. Connected to the supply voltage V DD Or ground voltage V SS Through the charging and discharging mechanism of the two capacitors, even if the power supply voltage does not reach the minimum operating voltage of the bias circuit, the comparator can still output the desired voltage level. When the power supply voltage is higher than the minimum voltage of the bias circuit After the working voltage, through the charging and discharging actions of the two capacitors, the comparator can output the correct voltage level.

[0037] See fi...

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Abstract

The invention provides a comparator circuit framework for improving low voltage output, which comprises a bias circuit, a differential pair stage circuit and an output stage circuit and is characterized in that two capacitors connected to a power supply voltage or grounded are arranged between the differential pair stage circuit and the output stage circuit of the comparator. The comparator circuit framework for improving low voltage output enables the comparator to output a preset voltage level before the power supply voltage reaches the minimum working voltage of the bias circuit.

Description

Technical field [0001] The present invention relates to a comparator circuit architecture for improving low-voltage output, and more particularly to an improvement that when a traditional comparator circuit encounters an excessively low power supply voltage, its internal nodes are in an unsteady state, so that its output is an unpredictable signal. In the present invention, a capacitor can be added to enable the comparator to still output a fixed potential when the power supply voltage is too low, so as to avoid application circuit errors caused by outputting unpredictable signals, so as to maintain the overall stability of the circuit. Background technique [0002] The well-known comparator is usually composed of a bias circuit, an input differential stage and an output stage. When the initial value of the power supply voltage starts to climb from 0V, the bias circuit at the front end of the comparator fails to work normally, causing the comparator It also cannot work normally, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/24
Inventor 叶茂祥
Owner HOLTEK SEMICON