TRANSIMPEDANCE AMPLIFIER (TIA) CIRCUIT AND METHOD

摘要

A TIA circuit and method are provided that merge the automatic gain control function with the bandwidth adjustment function to allow the TIA circuit to operate over a wide dynamic range at multiple data rates. The TIA circuit has an effective resistance that is adjustable for adjusting the gain and the bandwidth of the TIA circuit. The mechanism of the TIA circuit that is used to adjust the effective resistance, and hence the gain and bandwidth of the TIA circuit, is temperature independent, and as such, the performance of the TIA circuit is not affected by temperature variations.

主权项

1. A transimpedance amplifier (TIA) circuit comprising:
a TIA having at least one TIA input and at least one TIA output, the TIA input receiving an electrical signal generated by an optical detector in response to the optical detector converting an optical signal into the electrical signal, the TIA having an effective resistance that is adjustable, the TIA output outputting a TIA output signal; and a bandwidth adjustment (BWA) circuit electrically coupled with the TIA, the BWA circuit generating a BWA signal, and wherein the BWA circuit uses the BWA signal to produce at least one drive signal that is output to the TIA, and wherein the TIA adjusts the effective resistance of the TIA based on said at least one drive signal to control a gain and a bandwidth of the TIA circuit.