Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Nonlinear amplifying circuit
Reexamination Certificate
2007-06-05
2007-06-05
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Nonlinear amplifying circuit
C330S253000
Reexamination Certificate
active
11063612
ABSTRACT:
A first field effect transistor receives an unbalanced signal from an input terminal at the gate thereof, and outputs a balanced signal from the drain thereof. A second field effect transistor has the gate thereof connected to the drain of the first field effect transistor and outputs a balanced signal from the drain thereof. The sources of the first field effect transistor and the second field effect transistor are connected to the drain of a third field effect transistor serving as a current source. The drain of the second field effect transistor is connected to the gate of the first field effect transistor via a first resistor. A first output terminal is connected between the drain of the first field effect transistor and the first resistor, and a second output terminal is connected between the drain of the second field effect transistor and a second resistor. Balanced signals produced by conversion in the first field effect transistor and the second field effect transistor are output from the output terminals. The drain of the second field effect transistor is connected to the gate of the first field effect transistor via a feedback resistor.
REFERENCES:
patent: 4232270 (1980-11-01), Marmet et al.
patent: 5682120 (1997-10-01), Ito
patent: 6150882 (2000-11-01), Klemmer
patent: 6566949 (2003-05-01), Park
patent: 6566961 (2003-05-01), Dasgupta et al.
patent: 5-090849 (1993-04-01), None
McDermott Will & Emery LLP
Sanyo Electric Co,. Ltd.
Wells Kenneth B.
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