Active quenching circuit used for APD detector in Geiger mode

Abstract

The invention discloses an active quenching circuit used for an APD detector in a Geiger mode, and the circuit comprises an nmos tube M1, an nmos tube M2, a pmos tube M3, an nmos tube M4, a pmos tube M5, a pmos tube M6, an nmos tube M7, an nmos tube M8, a capacitor C1, a phase inverter Inv1, a phase inverter Inv2, and an NAND gate NAND. A drain electrode of the nmos tube M1 is connected with the anode of the APD detector, and the cathode of the APD detector is connected with a biasing reversal high-voltage VB+ex. The subnanosecond-level active quenching and quick resetting of the APD detector or an APD array are achieved through a feedback structure, and the quenching time is at a subnanosecond level. The maximum hold-off time is 5ns, and can be adjusted automatically according to the actual condition. The whole circuit structure is simple and compact, is small in area, is low in power consumption, is high in speed, is suitable for the quenching of a single or pixel-level APD detector, and reliably guarantees that the APD detector achieves the random continuous detection and the service life of a device is prolonged.

Description

technical field [0001] The invention belongs to the field of laser detection and readout circuits, in particular to an active quenching circuit applied to a Geiger mode APD detector. Background technique [0002] In 1953, K.G. McKay and K.B. McAfee discovered the multiplication phenomenon of silicon germanium photocurrent. More than ten years later, in 1965, the first avalanche photodiode (Avalanche PhotoDiode, APD) came out. This optoelectronic device has excellent characteristics different from other optoelectronic devices. at avalanche voltages above V B Under the reverse bias voltage bias, it has the ability to respond to a single photon and has extremely high detection sensitivity. APD is a photodetection device based on the internal photoelectric effect and has an internal high gain. The photogenerated carriers form an avalanche effect under the action of a high electric field to obtain a macroscopic photocurrent. It is the most promising photodetection device in re...

AI Technical Summary

Problems solved by technology

The gating mode can well solve the problem of large avalanche current and afterpulse, but the premise is that the arrival time of the photons is known, so this circuit structure is only suitable for the overhead detection of the airborne platform, but for the random arrival of photons Front-illuminated detection cannot be used, and continuous random detection cannot be achieved

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