A capacitive transimpedance amplifier circuit with pure digital output for weak light detection

Abstract

The invention belongs to the field of light detection, in particular to a capacitive transimpedance amplifier circuit with pure digital output for weak light detection, including a signal generation circuit, a CTIA-based light detection circuit and a two-stage inverter, which are connected in sequence, The signal generation circuit includes a sampling signal SELECT circuit and a square wave reset signal RESET circuit. The input terminal of the sampling signal SELECT circuit inputs an initial square wave signal, and the initial square wave signal is sent to an input end of an exclusive OR gate after passing through the first delay unit. The other input terminal of the OR gate is the initial square wave signal, and the pulse signal output by the XOR gate is ANDed with the initial square wave signal to obtain the sampling signal SELECT, and the square wave reset signal RESET is obtained from the initial square wave signal through the three-stage delay unit . Beneficial effects of the present invention: through the novel CTIA structure, pure digital output can be realized when weak light is detected, which is convenient for subsequent circuits to process.

Description

technical field [0001] The invention belongs to the field of light detection, in particular to a capacitive transimpedance amplifier circuit with pure digital output for weak light detection. Background technique [0002] With the maturity of microelectronics technology, there are more and more ways to acquire sensitive information for integrated circuits and information systems, which can generally be divided into non-invasive attacks and intrusive attacks. Among them, the intrusive attack destroys the chip package by opening the cover, drilling, corrosion and other means, and uses technologies such as photography and microprobes to extract important information such as layout and passwords, and the destruction of the package will expose the chip to light. under. Therefore, in order to enhance the anti-attack capability of chips or systems, weak light detectors are often designed to sense information such as cover opening and drilling, and provide early warning signals for...

AI Technical Summary

Problems solved by technology

However, since the purpose of this circuit is to detect weak light, in order to facilitate the processing of the alarm signal by the subsequent circuit, the ideal output alarm signal is a pure digital output, while the PWM signal needs to use a counter to convert the duty ratio information into a high level or Low-level signals, and doing so increases system complexity on the one hand, and increases system power consumption on the other hand

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