Patent ID: 6150882
Filing Date: 2000-11-21
Classification: H03F

Abstract:
In a communication transceiver receiving a signal from a signal source defined by a source impedance between first and second nodes, an amplifier having an input impedance matched to the source impedance comprising:a first transconductance cell comprising first and second transistors each having control, supply and output elements, the first transconductance cell receiving the signal from the signal source at the first and second control elements and developing a modified version of the signal as an output current signal at the first and second output elements, respectively, wherein the control element of the first transistor is connected to the output element of the second transistor, and the control element of the second transistor is connected to the output element of the first transistor, the first transconductance cell having a first transconductance related to the input impedance; anda second transconductance cell comprising third and fourth transistors connected to the first and second output elements, the second transconductance cell combining currents appearing at the first and second output elements and developing a combined output current signal at respective output terminals thereof, the second transconductance cell having a second transconductance related to the input impedance.