Patent ID: 7657191

Claim:
An adjustable bandwidth transimpedance amplifier comprising: an amplifier configured to receive a current signal; a feedback path coupling an input and an output of the amplifier; and a selectable resistance in the feedback path, resistance of the selectable resistance controlled by a control signal, the selectable resistance comprises a plurality of resistances, the plurality of resistances switchably coupled to the feedback path, the plurality of resistances comprising a plurality of resistors, the plurality of resistors coupled in series and at least some of the resistors each having a switch coupled in parallel, the control signal determining whether the switches are open or closed, the control signal being coupled to a plurality of comparators, and an output of each comparator is coupled to a corresponding switch; wherein the control signal is a voltage signal; wherein a current on a signal path is an indication of the current signal provided to the adjustable bandwidth transimpedance amplifier; and wherein the current on the signal path is provided by a current mirror.