High frequency variable gain amplifier device and wireless commu

Details High frequency variable gain amplifier device and wireless commu High frequency variable gain amplifier device and wireless commu

1997-11-19

2000-09-12

Urban, Edward F.

Telecommunications

Transmitter

Power control, power supply, or bias voltage supply

455574, 330 51, 330151, H04B 104, H01Q 1112

Patent

active

061189898

ABSTRACT:
To obtain a more stable gain control range and to reduce power consumption with a smaller scale circuitry having simpler configuration for gain control, a high frequency variable gain amplifier includes multi stage transistor amplifiers, a change-over switch circuit for controlling supplying and interruption of a power supply voltage, and a field effect transistor switch circuit with grounded-gate connection inserted in a bypass path midway across an input terminal and an output terminal. The source of this field effect transistor switch is in direct current-connection to the drain of a field effect transistor of the final stage transistor amplifier circuit. When a power supply voltage is supplied to each of the transistor amplifiers via the change-over switch circuit, the field effect transistor switch is turned "off" and when the power supply voltage is interrupted, the field effect transistor switch is tuned "on".

REFERENCES:
patent: 5060294 (1991-10-01), Schwent et al.
patent: 5152004 (1992-09-01), Vaisanen et al.
patent: 5216378 (1993-06-01), Einbinder et al.
patent: 5399927 (1995-03-01), Gruber et al.
patent: 5661434 (1997-08-01), Brozovich et al.
patent: 5831477 (1998-11-01), Tsumura
patent: 5909643 (1999-06-01), Aihara

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