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Operational amplifier control circuit

A technology for controlling circuits and operational amplifiers, which is applied in the direction of improving amplifiers to reduce temperature/power supply voltage changes, etc. It can solve the problems of control signal changes, frequent changes of control signals, etc., and achieve the effect of simple circuit and linear amplification

Inactive Publication Date: 2016-06-01
NINGBO AMBON EMERGENCY PROD
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  • Abstract
  • Description
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Problems solved by technology

[0003] Today's operational amplifier control circuits generally have two types; the first one is to directly compare the voltages at both ends of the input to make corresponding high and low voltage output control signals. This kind of circuit will frequently change the output voltage when the voltage fluctuates in a small range. Causes the control signal to change frequently; and the second is the control with delay, which compares and then outputs the control signal after a delay. This kind of circuit still exists when the voltage changes slowly, and it will change the output voltage and cause the control signal to change.

Method used

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Embodiment Construction

[0009] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0010] See figure 1 , an operational amplifier control circuit, comprising a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a diode Z1, an operational amplifier U1A, a circuit power supply VCC, an input port Vin, and an output port Vout; The input port Vin is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to the positive input terminal of the operational amplifier U1A, and the other end of the first resistor R1 is also connected to one end of the fourth resistor R4. One end of the four resistors R4 is also connected to one end of the third resistor R3, the other end of the third resistor R3 is also connected to the output end of the operational amplifier U1A, and the negative input end of the operational amplifier U1A is connected to one end of the second r...

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Abstract

The invention discloses an operational amplifier control circuit. A fixed voltage is supplied to the negative input end of an operational amplifier by using a second resistor and a diode; voltage division is carried out to the input signal at an input port by a first resistor and a fourth resistor; then the input signal is input to the positive input end of the operational amplifier; the input signal is compared through the operational amplifier, is output to the output end of the operational amplifier and is fed back to the positive input end of the operational amplifier; the output voltage is enabled to generate a certain Schmidt characteristic; and the output end of the operation amplifier can generate certain difference value changes aiming at the input voltage level changes.

Description

technical field [0001] The invention relates to the field of operational amplifier circuits, and specifically designs an operational amplifier control circuit. Background technique [0002] Operational amplifier is the abbreviation of operational amplifier; in actual circuits, it is usually combined with a feedback network to form a certain functional module; because it was used in analog computers in the early days to achieve mathematical operations, it was named "operational amplifier", and this name has continued. Up to now; op amp is a circuit unit named from the perspective of function, which can be realized by discrete devices or in semiconductor chips; with the development of semiconductor technology, most of today's op amps are in the form of a single chip Existence; today there are many types of op amps, which are widely used in almost all industries. [0003] Today's operational amplifier control circuits generally have two types; the first one is to directly comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/30
CPCH03F1/30
Inventor 何建芬徐乃军
Owner NINGBO AMBON EMERGENCY PROD
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