Transimpedance pre-amplifier with improved bandwidth

摘要

A transimpedance pre-amplifier (TIA) with an improved bandwidth. In the TIA, a feedback circuit is added to a regulated cascode structure to be connected in parallel, so that an input resistance value is reduced and a bandwidth is easily broadened. Alternatively, an inductor is added to the regulated cascode structure, so that an input capacitance is reduced and bandwidth is easily broadened.

主权项

1. A transimpedance pre-amplifier (TIA) comprising:
a regulated cascode circuit configured to include an amplification unit that amplifies an input current to generate an output voltage, and a first feedback amplification unit that is connected to an input node of the amplification unit and amplifies the input current to cause a negative feedback to the amplification unit; and a second feedback amplification unit configured to amplify an output of the first feedback amplification unit and to provide a positive feedback to an input node of the regulated cascode circuit, for reducing an input resistance of the regulated cascode circuit.