High-bandwidth current-current sensor interface circuit

Abstract

The invention belongs to the technical field of an electronic circuit and relates to a high-bandwidth current-current sensor interface circuit. The high-bandwidth current-current sensor interface circuit provided by the invention is applicable to large capacitance. The circuit is a current amplifier with low input impedance and low gain. A part of current gain of the circuit is realized under the broad enough bandwidth, the large capacitance of an input node is isolated, and front-stage noise is suppressed. Subsequently, the circuit can be employed through combination of a rear-stage trans-impedance amplifier. The rear-stage trans-impedance amplifier can be a traditional high-gain trans-impedance amplifier and provides certain gain for the circuit, the circuit drive capability is improved, and the low noise, high bandwidth and high gain of the integrated structure are realized.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits and relates to a high-bandwidth current-current sensor interface circuit. Background technique [0002] In high-speed sensing integrated circuits, sensors often generate weak current signals after receiving other non-electrical signals, and at the same time, the front-end parasitic capacitance of these sensors is relatively large. Especially in high-speed photoelectric integrated circuits, photodiodes generate weak current signals after receiving light signals. In order to facilitate the post-stage circuit to process information, it is necessary to convert the current signal into a voltage signal with an appropriate amplitude, so the pre-stage weak current detection circuit is required to have a large gain; and considering the parasitic capacitance at the front end of the sensor, especially the case of large capacitance Under the circumstances, the overall circuit cannot obtain high g...

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Problems solved by technology

[0004] What the present invention aims to solve is to solve the above-mentioned problem that the front-stage amplifier circuit must be required to provide sufficient output amplitude in order to reduce the influence of the noise of the rear-stage circuit on the electrical signal, especially for general sensor integrated chips. The transimpedance amplifier in the pre-stage detection electrical signal circuit cannot output a large enough voltage amplitude to overcome the limitation of noise influence

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