A Photodiode Sensor Readout Circuit Utilizing a Differential Current Mirror for Dark Current Cancellation
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This paper proposes a differential current mirror circuit with built-in dark current cancellation for photodiode applications. The photodiode sensor, modeled with a diode and a parasitic capacitor, generates a current signal that is directed through two current mirrors. The signals from each current mirror are then differentially outputted. Thanks to the proposed differential current mirrors, the only high frequency signal current can be transferred to output port effectively. The proposed sensor interface ICs were implemented using the PDK of the DB Hitek process and achieved a dark current cancellation ratio of 40 dB at a reconfigurable frequency.
Abstract
This paper proposes a differential current mirror circuit with built-in dark current cancellation for photodiode applications. The photodiode sensor, modeled with a diode and a parasitic capacitor, generates a current signal that is directed through two current mirrors. The signals from each current mirror are then differentially outputted. Thanks to the proposed differential current mirrors, the only high frequency signal current can be transferred to output port effectively. The proposed sensor interface ICs were implemented using the PDK of the DB Hitek process and achieved a dark current cancellation ratio of 40 dB at a reconfigurable frequency.
참고문헌 (7)
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