Voltage-current conversion circuit

A voltage-current conversion and circuit technology, applied in the direction of adjusting electric variables, control/regulation systems, instruments, etc., can solve problems such as long-term triangular wave current signals, and achieve the effect of improving accuracy and reducing the number

Active Publication Date: 2017-12-19
SEMICON MFG INT (SHANGHAI) CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, it takes a long time for the OTA circuit in the vol

Method used

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Embodiment Construction

[0023] The voltage-current compensation circuit in the prior art includes a voltage-current conversion circuit, and the voltage-current conversion circuit is usually used in the current compensation circuit in a current-type switching power supply circuit. The current compensation circuit can eliminate the subharmonic oscillation of the switching power supply circuit and improve the loop stability. The current compensation circuit as a compensation circuit needs to provide a current signal that follows the triangular wave. Since the triangular wave current signal needs to be followed, the bandwidth is required to be greater than the frequency of the triangular wave current signal.

[0024] The current compensation circuit in the prior art includes an OTA circuit, and its working principle is to realize that the voltage at the feedback output terminal of the OTA circuit follows the triangular wave signal through unit gain negative feedback. Since it is a triangular wave signal,...

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Abstract

Provided is a voltage-current conversion circuit. The voltage-current conversion circuit comprises an initial voltage providing circuit and an OTA circuit. The initial voltage providing circuit is coupled between a feedback output end of the OTA circuit and a first NMOS tube of the OTA circuit, and is used to provide initial voltage for the feedback output end of the OTA circuit when the OTA circuit is started. The OTA circuit is used to amplify a preset supply voltage signal according to preset gain, so as to output a current signal which changes with a preset triangular wave signal on the basis of the initial voltage. The above scheme can make the OTA circuit in the voltage-current conversion circuit realize fast following on triangular wave signals.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a voltage-current conversion circuit. Background technique [0002] Voltage-to-current conversion circuits are usually used in current compensation circuits in current-mode switching power supply circuits. The current compensation circuit can eliminate the subharmonic oscillation of the switching power supply circuit and improve the loop stability. The main body of the current compensation circuit is a transconductance amplifier (Operational Transconductance Amplifier, OTA circuit) circuit. As a compensation circuit, the OTA circuit needs to provide a current that can follow the triangular wave. Since it needs to follow the triangular wave, the bandwidth is required to be greater than the frequency of the triangular wave signal. [0003] In the prior art, it takes a long time for the OTA circuit in the voltage-current conversion circuit to follow the triangular wave...

Claims

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Application Information

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IPC IPC(8): G05F1/565
CPCG05F1/565
Inventor 翁芊陈萍
Owner SEMICON MFG INT (SHANGHAI) CORP
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