Patent ID: 7482872

Claim:
An amplifier comprising: a voltage input configured to receive at least one voltage signal; a current output configured to provide at least one current signal, wherein a ratio between the at least one voltage signal and the least one current signal forms a total transconductance for the amplifier; a circuit including at least one first integrated resistor connected in an amplifier signal path, the circuit adapted to maintain the total transconductance substantially constant across variation of the at least one first integrated resistor; and at least one amplifier circuit connected between the voltage input and the current output, the at least one amplifier circuit including a bias current circuit having at least one second integrated resistor connected to establish, at least in part, at least one bias current for the amplifier, and wherein the circuit is adapted to maintain the total transconductance substantially constant across variation of the at least one second integrated resistor; wherein the at least one amplifier circuit includes a first amplifier circuit having at least one input connected to the voltage input, and a second amplifier circuit having at least one input connected to an output of the first amplifier circuit.