Semtech Corporation

Gurpreet Singh Bhullar

A variable transimpedance amplifier may include first and second amplifiers. Each of the first and second amplifiers may include a transistor amplifier with a feedback resistor and a capacitor. The output node of the first amplifier may be an output node of the variable transimpedance amplifier. The output node of the second amplifier is not part of the output node of the variable transimpedance amplifier. The open loop gains of the transistor amplifiers may be variable, but the feedback resistor values can be fixed. The transimpedance may be determined by the feedback resistors and a scaling factor proportional to ratio of open loop gains. The transistor amplifiers may share an input transistor. The configuration can provide a high dynamic range of variable transimpedance that is stable over process and operating condition variations, minimize input capacitance loading and noise contribution to small input signals.

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Ottawa, Canada

Gurpreet Singh Bhullar