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a hysteretic comparator

A hysteresis comparator and inverter technology, applied in the field of hysteresis comparators, can solve problems such as poor output characteristics, high power consumption, unfavorable circuit integration, etc., and achieve good output characteristics and reduce power consumption

Active Publication Date: 2018-09-07
INSPUR BEIJING ELECTRONICS INFORMATION IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the external positive feedback structure of the integrated operational amplifier is adopted, which is not conducive to the integration of the circuit and has high power consumption
In addition, the threshold voltage cannot be adjusted, resulting in poor output characteristics with hysteresis characteristics

Method used

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Embodiment 1

[0030] figure 1 The structure diagram of the hysteresis comparator provided for the first embodiment. Such as figure 1 As shown, the hysteresis comparator includes a two-stage operational amplifier 1 for providing gain; positive feedback circuit 2 for obtaining the corresponding threshold voltage according to its setting parameters; enable control circuit 3 for controlling by outputting an enable signal The hysteresis comparator is in working state or static;

[0031] The two-stage operational amplifier 1 includes: a differential amplifier circuit, a third NMOS and a current source;

[0032] The positive feedback circuit 2 includes: a first inverter, a second inverter, a fifth NMOS, and a sixth NMOS;

[0033] Wherein, the gate of the sixth NMOS is connected to the differential amplifier circuit, the drain of the sixth NMOS is connected to the gate of the differential amplifier circuit and the third NMOS, the source of the sixth NMOS is connected to the drain of the fifth NM...

Embodiment 2

[0038] figure 2The circuit diagram of the hysteresis comparator provided for the second embodiment. image 3 provided for the present invention figure 2 The equivalent circuit diagram. Figure 4 A schematic diagram of the voltage transfer characteristics of the hysteresis comparator provided by the present invention. Such as figure 2 As shown, the differential amplifier circuit of the two-stage operational amplifier 1 specifically includes: a first PMOS, a second PMOS, a first NMOS and a second NMOS;

[0039] Among them, the gate of the first PMOS is connected to the input voltage terminal V in Connection, the source of the first PMOS and the source of the second PMOS are connected to the current source, the drain of the first PMOS is connected to the drain of the first NMOS and the gate of the first NMOS, and the gate of the second PMOS is connected to the reference The voltage terminal is connected, the drain of the second PMOS is connected with the drain of the seco...

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Abstract

The present invention discloses a hysteresis comparator. The hysteresis comparator comprises: a two-stage operational amplifier configured to provide gain; a regenerative feedback circuit configured to obtain corresponding threshold voltage according to the setting parameters; and an enablement control circuit configured to control the hysteresis comparator to be located in a work state or a static state through outputting enablement signals. The hysteresis comparator leads the regenerative feedback circuit in the operational amplifier to facilitate integration, and obtains different threshold voltages through regulation of related parameters of the regenerative feedback circuit so as to allow the hysteresis comparator to have good output characteristics. Besides, the hysteresis comparator is provided with the enablement control circuit and is able to control the state of the hysteresis comparator through the output signals of the enablement control circuit so as to facilitate reducing the power consumption of the hysteresis comparator.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a hysteresis comparator. Background technique [0002] The comparator takes an analog signal and a reference voltage as an input, and outputs a binary digital signal with only high and low levels, and can be used as an interface circuit between an analog circuit and a digital circuit. Generally, the noise of the comparator near the threshold voltage has a great influence, and the hysteresis comparator introduces positive feedback, which produces a "hysteresis" characteristic at the threshold point and has a strong anti-interference ability. In the prior art, an external positive feedback structure of an integrated operational amplifier is adopted, which is not conducive to circuit integration and has relatively high power consumption. In addition, the threshold voltage cannot be adjusted, resulting in poor output characteristics with hysteresis characteristics. [0003] It ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/24
CPCH03K5/2481
Inventor 王硕唐涛石广刘海林
Owner INSPUR BEIJING ELECTRONICS INFORMATION IND