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Hysteresis comparator

A hysteresis comparator, amplifier technology, applied in multiple input and output pulse circuits and other directions, can solve the problems of low precision and low practicability

Inactive Publication Date: 2011-05-25
EAST CHINA INST OF OPTOELECTRONICS INTEGRATEDDEVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the existing comparator's shortcomings of being greatly affected by process parameters, power supply voltage and temperature, low precision, and poor practicability, and to provide a high-precision and high-stability hysteresis comparator. The device has the characteristics of simple structure, not easily affected by process conditions, external temperature and power supply voltage, etc., and has good application value.

Method used

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Embodiment Construction

[0022] The comparator can be divided into two parts, the amplifier and the threshold generation circuit. figure 1 is the structural block diagram of the comparator, wherein 100 is the amplifier circuit, and Vin is the input terminal of the amplifier. The amplifier is output to the threshold generating circuit 200 via 101 for controlling the threshold generating circuit. Vth+ and Vth- are threshold input terminals, and the threshold voltage generated by the threshold generating circuit 200 according to selection is transmitted to the amplifier 100 via 102 for comparison. Circuit structure such as figure 2 As shown, the signal is input from Vin, compared with the comparator, and output from Vout1. Through the level of Vout1, the function of controlling the transmission gate TG1 and TG2 is realized, so that Vth+ or Vth- is output to the gate of M1 through the transmission gate. Pole is compared with Vin and output from Vout.

[0023] The specific working principle of the circ...

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Abstract

The invention relates to a high-precision high-stability hysteresis comparator. 100 refers to an amplifier circuit, Vin refers to the input end of an amplifier, and an output signal of the amplifier is output to a threshold generating circuit 200 through 101 so as to control the threshold generating circuit. Vth+ and Vth- are threshold input ends, and the threshold generating circuit 200 generates threshold voltage according to selection and transmits the threshold voltage to the amplifier 100 for comparison. The amplifier adopts a rail-to-rail structure, and can realize comparison in a full range from volt current condenser (VCC) to ground (GND); and the threshold generating circuit consists of an alternative transmission gate, and threshold level is input externally. The comparator has high power supply stability and is insusceptible to external temperature change.

Description

technical field [0001] The invention belongs to the technical field of semiconductor integrated circuits, in particular to a hysteresis comparator circuit. Background technique [0002] In actual use, due to the variation of the power supply voltage, the deviation of the resistance value, and the temperature drift of the operational amplifier, the output of the voltage comparator is often wrong. The potentiometer must be readjusted to change the threshold voltage, so that the comparator can work normally again and output a control signal that meets the requirements. Therefore, we need to introduce a comparator with a stable and adjustable threshold value with a certain hysteresis width, which is not affected by power supply voltage and external temperature changes. Hysteresis is a property of a comparator whose input threshold is a function of the input (output) level. In particular, the output changes when the input reaches the threshold, and at the same time the input th...

Claims

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Application Information

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IPC IPC(8): H03K5/24
Inventor 唐兴刚洪明陈超胡传菊
Owner EAST CHINA INST OF OPTOELECTRONICS INTEGRATEDDEVICE
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