Circuit capable of preventing reversal of current of operational amplifiers connected in series

A technology of current inversion and op amp, applied in the direction of differential amplifier, DC-coupled DC amplifier, amplifier input/output impedance improvement, etc.

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

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Problems solved by technology

[0002] Under normal circumstances, in the power-on state, no circuit is connected in the middle of the op amp cascading. The risk of this approach is that when the output of the previous stage is not fixed, it is easy to cause the circuit of the subsequent stage to inject a large current through the output of the previous stage. situation, leading to the failure of the previous stage

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  • Circuit capable of preventing reversal of current of operational amplifiers connected in series

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Embodiment Construction

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

[0009] As shown in the figure, the present invention is a circuit to prevent the backflow of the operational amplifier in series. Two operational amplifiers U1 and U2 are cascaded. The non-inverting terminal of the operational amplifier U1 and the output terminal are connected to a capacitor C1, and the non-inverting terminal of the operational amplifier U2 is connected to A capacitor C2 is connected between the output ends, the output end of the op amp U1 is connected to the inverting end of the op amp U2 through the resistance R3 as an input of the op amp U2, and the non-inverting end of the op amp U2 is connected to the other signal input through the point R4.

[0010] When the input terminal of the op amp U1 is floating, its output is indefinite and the impedance is very low. At this time, if the VCC+ and VCC- of the op amp U1 and U2 are both powered on, the inpu...

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Abstract

The invention provides a circuit capable of preventing reversal of current of operational amplifiers connected in series. The output end of the operational amplifier U1 is connected with the phase reversal end of the operational amplifier U2 through a resistor R3 and is used as one path of input of the operational amplifier U2. The resistor is connected between the two levels of operational amplifiers in series when the two levels of operational amplifiers are in cascade connection, so that the magnitude of reverse current is effectively limited, and the circuit is protected.

Description

Technical field [0001] The present invention relates to the technical field of operational amplifier applications, and in particular to a circuit for preventing backflow of serial operational amplifier current. Background technique [0002] Under normal circumstances, in the power-on state, no circuit is connected in the middle of the op amp cascade. The risk of this approach is that when the output of the front stage is not fixed, it is easy to cause the back stage circuit to sink a large current through the output Circumstances cause the previous stage to fail. Summary of the invention [0003] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a circuit that prevents backflow of the series operational amplifier current, which utilizes the current limiting effect of the resistor to effectively limit the magnitude of the backflow current and protect the circuit. [0004] In order to achieve the above objective...

Claims

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Application Information

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IPC IPC(8): H03F3/45H03F1/56
Inventor 杨立斌
Owner XIAN WEIZHENG ELECTRONICS SCI & TECH
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