TRANS-IMPEDANCE AMPLIFIER WITH REPLICA GAIN CONTROL

摘要

This disclosure relates to the field of amplifiers for multi-level optical communication and more particularly to techniques for trans-impedance amplifiers (TIA) with gain control. The claimed embodiments address the problem of implementing a low cost TIA that exhibits high linearity, low noise, low power, and wide bandwidth. More specifically, some claims are directed to approaches for providing TIA gain control using a plurality of inverter-based replica gain control cells controlled by a feedback loop to manage the current into the amplifying output stage and thereby the TIA output voltage.

主权项

1. A trans-impedance amplifier comprising:
a first common node to receive a first current input; a first inverting amplifier having a first amplifier input coupled to the first common node, and having a first voltage output; and a first replica gain control module comprising a first module input coupled to the first common node, and at least one replica gain control cell having a cell terminal coupled to the first module input, wherein the first replica gain control module diverts a first replica gain control portion of the first current input away from the first inverting amplifier to effect the first voltage output.