Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Utilizing three or more electrode solid-state device
Patent
1997-02-07
1998-05-12
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Utilizing three or more electrode solid-state device
327427, 327323, 327538, H03K 17687
Patent
active
057511810
ABSTRACT:
A power amplifier circuit includes a first field effect transistor power amplifier having a gate; a gate voltage supply for supplying a gate voltage to the gate of the first field effect transistor; and a gate voltage control including a second field effect transistor which has the same threshold voltage as the first field effect transistor. The gate voltage control receives, as an input voltage, the gate voltage output from the gate voltage supply, and increases the gate voltage when the gate voltage is lower than the threshold voltage of the first field effect transistor, preventing the first field effect transistor from being pinched off. Therefore, when the pinch-off voltage of the first field effect transistor varies or when the voltage supplied from the gate voltage supply varies, unwanted pinch-off of the first field effect transistor is avoided in the lower power consumption state so that the stability of the circuit is improved.
REFERENCES:
patent: 4492883 (1985-01-01), Janutka
patent: 4716356 (1987-12-01), Vyne et al.
patent: 5422608 (1995-06-01), Levesque
patent: 5495198 (1996-02-01), Chen
Maemura Kousei
Yamamoto Kazuya
Mitsubishi Denki & Kabushiki Kaisha
Tran Toan
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