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Circuit for restraining self-excitation of capacitive load operational amplifier circuit

A technology of operational amplifier circuits and capacitive loads, which is applied in the field of circuits that suppress the self-excitation of capacitive load operational amplifier circuits, can solve problems such as circuit unavailability and burnt circuits, and achieve the effects of improving reliability and solving self-excitation problems

Inactive Publication Date: 2014-06-04
XIAN WEIZHENG ELECTRONICS SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Under many capacitive load conditions, op amps are prone to self-excitation, making the circuit unusable, and even more seriously, even directly burning the circuit

Method used

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  • Circuit for restraining self-excitation of capacitive load operational amplifier circuit

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Embodiment Construction

[0008] The present invention will be described in more detail below in conjunction with the accompanying drawings and embodiments.

[0009] As shown in the figure, the present invention is a circuit that suppresses the self-excitation of capacitive load operational amplifier circuits. The operational amplifier U1 is a dual power supply operational amplifier. terminal and the output terminal are connected through parallel resistor R4 and capacitor C1. The output of the operational amplifier U1 is connected to the base of the transistor Q1 through the resistor R3, the base of the transistor Q1 is also grounded through the capacitor C2, the emitter of the transistor Q1 is grounded, the collector is the output terminal, and the output terminal is connected to the power supply through the resistor R5.

[0010] In the present invention, the input signal is amplified by the operational amplifier U1 to drive the triode Q1, and the signal is then amplified by Q1 to output the Vout sign...

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Abstract

The invention provides a circuit for restraining self-excitation of a capacitive load operational amplifier circuit. The output of an operational amplifier U1 is connected with a base of an audion Q1 through a resistor R3. The base of the audion Q1 is grounded through a capacitor C2. An emitter of the audion Q1 is grounded. A collector is the output end connected with a power source through a resistor R5. The circuit solves the problem of self-excitation generated in the operational amplifier application and improves the reliability.

Description

technical field [0001] The invention relates to the technical field of operational amplifier applications, in particular to a circuit for suppressing self-excitation of a capacitive load operational amplifier circuit. Background technique [0002] Under many capacitive load conditions, op amps are prone to self-excitation, making the circuit unusable, and even more seriously, even directly burning the circuit. Contents of the invention [0003] In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a circuit that suppresses the self-excitation of the capacitive load op-amp circuit, and changes the zero-pole point of the circuit through series resistance to make the op-amp circuit work stably. [0004] In order to achieve the above object, the technical scheme adopted in the present invention is: [0005] A circuit that suppresses the self-excitation of a capacitive load operational amplifier circuit. The o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45
Inventor 李程
Owner XIAN WEIZHENG ELECTRONICS SCI & TECH
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