High speed transimpedance amplifier

摘要

A high speed transimpedance amplifier includes an inverting unit, at least one gain module, and a feedback resistor. The inverting unit has an input terminal coupled to a photodiode for receiving an input voltage, and an output terminal for outputting a first voltage. The at least one gain module has an input terminal coupled to the output terminal of the inverting unit for receiving the first voltage, and an output terminal for outputting an output voltage. Each gain module includes a first gain inverting unit and a second gain inverting unit which are coupled to each other. The first gain inverting unit and the second gain inverting unit dominate bandwidth of the high speed transimpedance amplifier. The feedback resistor is coupled to the input terminal of the inverting unit and the output terminal of the at least one gain module for determining a transimpedance of the high speed transimpedance amplifier.

主权项

1. A high speed transimpedance amplifier, comprising:
an inverting unit having an input terminal coupled to a photodiode for receiving an input voltage, and an output terminal for outputting a first voltage, wherein the inverting unit comprises:
a first resistor having a first terminal for receiving a first direct current voltage, and a second terminal for outputting the first voltage; anda first N-type metal-oxide-semiconductor transistor having a first terminal coupled to the second terminal of the first resistor, a second terminal coupled to the photodiode, and a third terminal coupled to ground; at least one gain module having an input terminal coupled to the output terminal of the inverting unit for receiving the first voltage, and an output terminal for outputting an output voltage, wherein each gain module comprises:
a first gain inverting unit for receiving the first voltage; anda second gain inverting unit coupled to the first gain inverting unit for outputting the output voltage, wherein the first gain inverting unit and the second gain inverting unit are used for dominating bandwidth of the high speed transimpedance amplifier; and a feedback resistor coupled to the input terminal of the inverting unit and the output terminal of the at least one gain module for determining transimpedance of the high speed transimpedance amplifier.