Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Reexamination Certificate
2005-07-05
2005-07-05
Choe, Henry (Department: 2817)
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
C330S129000
Reexamination Certificate
active
06914483
ABSTRACT:
A signal is sampled at a stage following a first amplifier circuit (12, 14, 16) and preceding a second amplifier circuit (20, 22), and the presence or absence of a signal is detected by a detector circuit (30). When the presence of a signal is detected, a gate bias circuit (32) switches a gate bias for FETs in the second amplifier circuit (20, 22) to a normal operating voltage value, and when the signal is no longer detected, the gate bias is switched to a voltage value that reduces power consumption, after a mask time has elapsed. In a distortion feedback-type high-frequency amplifier circuit, a means for cutting off a circuit portion for the adjustment of each of a distortion extracting circuit and an inverse distortion adding circuit is achieved by switching FET gate voltage so as to put the corresponding amplifier in a virtually cutoff condition.
REFERENCES:
patent: 5532646 (1996-07-01), Aihara
patent: 6710649 (2004-03-01), Matsumoto et al.
patent: 6791418 (2004-09-01), Luo et al.
patent: 6822517 (2004-11-01), Matsumoto et al.
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patent: 7-288433 (1995-10-01), None
patent: 11-261343 (1999-09-01), None
patent: 2001-358540 (2001-12-01), None
Internation Search Report dated Jun. 11, 2002.
Choe Henry
Fujitsu Limited
Katten Muchin Zavis & Rosenman
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