Patent ID: 7492225

Claim:
A gain-controlled amplifier, comprising: a set of switches; first and second transistors, respectively comprising a control terminal, a first terminal and a second terminal, second terminals of the first and second transistors being coupled to each other via a resistive element; a first current mirror, coupled to the first terminal of the first transistor and a first terminal of the resistive element, for providing a set of first currents; a second current mirror, coupled to the first terminal of the second transistor and a second terminal of the resistive element, for providing a set of second currents; a first resistive network, coupled to the second terminal of the first transistor via a first current source, for providing a first output signal; and a second resistive network, coupled to the second terminal of the second transistor via a second current source, for providing a second output signal; wherein the first and second resistive networks respectively comprise a plurality of taps coupling to either a first current in the set of first currents or a second current in the set of second currents through one switch in the set of switches.