Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1994-06-30
1995-10-10
Wambach, Margaret Rose
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327362, 327312, 327306, 327512, H03L 500, G05F 110
Patent
active
054574226
ABSTRACT:
A biasing device for actively biasing the base of an RF device operating in quasi-linear modes. The biasing device provides a source of low-impedance current and high current capability. The biasing device includes three transistors, each having a base, collector and emitter and one low turn-on diode. The first and second transistors are connected such that changes in the base-emitter voltage of the biased RF device can be detected. The third transistor is configured in a Darlington configuration with the first transistor in order to provide (1) increased sensitivity to voltage changes detected by the second transistor and (2) additional collector voltage for the second transistor to prevent it from operating in saturation. The low turn-on diode is a compensating diode which thermally tracks and compensates for operating changes in the second transistor due to temperature.
REFERENCES:
patent: 3501710 (1970-03-01), Liepins et al.
patent: 3984783 (1976-10-01), Bickley
patent: 4924194 (1990-05-01), Opas et al.
Jorgenson Lisa K.
Larson Renee M.
Ratner Allan
SGS-Thomson Microelectronics Inc.
Wambach Margaret Rose
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