Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1998-12-18
2000-11-21
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330295, H03F 345
Patent
active
061508829
ABSTRACT:
In a communication transceiver receiving a signal from a signal source defined by a source impedance between first and second nodes, an amplifier is provided having an input impedance matched to the source impedance. The amplifier includes a first transconductance cell having a first transconductance related to the input impedance and including first and second transistors each having control, supply and output elements. The first transconductance cell receives the signal from the signal source at the first and second control elements and develops a modified version of the signal as an output current signal at the first and second output elements, respectively. The first and second transistors are interconnected such that 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 amplifier further includes a second transconductance cell having a second transconductance related to the input impedance and including third and fourth transistors connected to the first and second output elements. The second transconductance cell combines currents appearing at the first and second output elements and develops a combined output current signal at respective output terminals thereof.
REFERENCES:
patent: 5216380 (1993-06-01), Carbou
patent: 5381112 (1995-01-01), Rybicki et al.
patent: 5854574 (1998-12-01), Singer et al.
Ericsson Inc.
Nguyen Khanh Van
Pascal Robert
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