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Regenerative comparator

A hysteresis comparator and operational amplifier technology, applied in the field of hysteresis comparators, can solve problems such as affecting system performance, limiting the range of input signals, no output, etc., achieving the effect of strong anti-interference ability and large input signal range

Inactive Publication Date: 2012-07-11
SHANGHAI HUAHONG INTEGRATED CIRCUIT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of hysteresis comparator has certain requirements on the input signal because the signal input terminal Vin is directly connected to the negative input terminal of the operational amplifier A, which limits the range of the input signal
In the actual circuit design, we cannot accurately control the output signal of the previous stage. If the input signal does not meet the requirements, the output of the hysteresis comparator will be unstable or have no output, which will affect the system performance.

Method used

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Embodiment Construction

[0015] see figure 2 , The hysteresis comparator of the present invention includes an operational amplifier A with differential input and single-ended output; four resistors R1, R2, R3, R4; a capacitor C; signal input terminal Vin; signal output terminal Vout. Wherein, the positive input terminal of the operational amplifier A is connected to the signal input terminal Vin through a resistor R1 on the one hand, and connected to the output terminal of the operational amplifier A through a resistor R2 on the other hand. On the one hand, the negative input terminal of the operational amplifier A is connected to the signal input terminal Vin through the resistor R3, on the other hand, it is grounded through the resistor R4, and on the other hand, it is grounded through the capacitor C. The output terminal of the operational amplifier A is used as the signal output terminal Vout.

[0016] In the hysteresis comparator of the present invention, operational amplifier A, resistor one R...

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Abstract

The invention discloses a regenerative comparator comprising an operational amplifier with a differential input and a single-ended output, four resistors, a capacitor, a signal input terminal, and a signal output terminal. A positive input terminal of the operational amplifier is connected with the signal input terminal by a resistor I and is also connected with an output terminal of the operational amplifier by a resistor II. And a negative input terminal of the operational amplifier is connected with the signal input terminal by a resistor III, is grounded by a resistor IV and is also grounded by the capacitor. Besides, the output terminal of the operational amplifier is used as the signal output terminal. According to the invention, the regenerative comparator has advantages of large input signal range and strong anti-interference capability and the like.

Description

technical field [0001] The invention relates to a hysteresis comparator in an analog integrated circuit. Background technique [0002] Hysteresis comparator (regenerative comparator), also known as Schmitt trigger (Schmitttrigger), is widely used because it can filter out interference noise. [0003] See figure 1 , which is the most common hysteresis comparator, connected by the amplifier into the form of positive feedback. Specifically, it includes an amplifier A with differential input and single-ended output and two resistors R1 and R2. The positive input terminal of the amplifier A is connected to the signal input terminal Vin through a resistor R1 on the one hand, and connected to the output terminal of the amplifier A through a resistor R2 on the other hand. The signal input terminal Vin is also directly connected to the negative input terminal of the amplifier A. The output terminal of the amplifier A is used as the signal input terminal Vout. [0004] figure 1 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K5/24
Inventor 马和良倪昊景一欧
Owner SHANGHAI HUAHONG INTEGRATED CIRCUIT
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