Switchable readout device

摘要

A readout device is adapted for dual-band sensing, and includes an amplifier, two direct injection (DI) readout circuits to be respectively connected to two sensors, and a switching module. Through operation of the switching module, one of the DI readout circuits can be electrically connected to the amplifier, and cooperate with the other DI readout circuit to achieve a dual-band sensing feature.

主权项

1. A readout device adapted for use with a first sensor and a second sensor, the first sensor generating a first sensed current upon a sensing activity thereof, the second sensor generating a second sensed current upon a sensing activity thereof, said readout device comprising:
an amplifier including a first input disposed to receive a reference voltage, a second input and an output; a first direct injection (DI) readout circuit including a current input to be coupled to the first sensor so as to receive the first sensed current therefrom, and a biasing terminal, and configured to convert the first sensed current for obtaining a first output voltage; a second DI readout circuit including a current input to be coupled to the second sensor so as to receive the second sensed current therefrom, and a biasing terminal, and configured to convert the second sensed current for obtaining a second output voltage; and a switching module coupled to said second input of said amplifier and said current inputs of said first and second DI readout circuits, said switching module being controllable to make or break electrical connection between said current input of said first DI readout circuit and said second input of said amplifier, and to make or break electrical connection between said current input of said second DI readout circuit and said second input of said amplifier; said switching module being further coupled to said output of said amplifier and said biasing terminals of said first and second DI readout circuits, and to be coupled to a bias voltage source, said switching module being controllable to make or break electrical connection between said biasing terminal of said first DI readout circuit and one of said output of said amplifier and the bias voltage source, and to make or break electrical connection between said biasing terminal of said second DI readout circuit and one of said output of said amplifier and the bias voltage source.