Patent ID: 7525391

Claim:
A linear transimpedance amplifier with two or more gain paths, the linear transimpedance amplifier comprising: a forward transimpedance circuit that receives an input signal from an optical device that converts an optical signal to the input signal, wherein the forward transimpedance circuit generates a linear output signal, and wherein the forward transimpedance circuit includes a first gain path and a second gain path, the first gain path configured to amplify the input signal when the first gain path is at a lower input impedance relative to the second gain path and the second gain path configured to amplify the input signal when the second gain path is at a lower input impedance relative to the first gain path; and a feedback circuit that includes: a first circuit that detects a low frequency component of the output signal; and a second circuit that is driven by the low frequency component of the output signal and is connected with the forward transimpedance circuit such that the second circuit uses an average optical device current at least partially control when the input signal is amplified by the first gain path and when the input signal is amplified by the second gain path.