Low-distortion transimpedance amplifier structures and methods

摘要

Transimpedance amplifiers are provided that generate low-distortion output voltage signals with simple, inexpensive structures that are compatible with integrated-circuit fabrication processes. The amplifiers include a current processor and a complementary output stage. The processor provides in-phase upper and lower current signals in response to a differential input current signal and differentially alters respective first and second amplitudes of these signals in response to a common-mode input current signal. The complementary output stage has upper and lower transistors that provide the output voltage signal in respective response to the upper and lower current signals and with distortion that is reduced by the altered first and second amplitudes.