Amplifiers – With semiconductor amplifying device – Including gain control means
Reexamination Certificate
2006-12-12
2006-12-12
Tra, Quan (Department: 2816)
Amplifiers
With semiconductor amplifying device
Including gain control means
C330S285000
Reexamination Certificate
active
07148748
ABSTRACT:
A peak detector detects an amplifier output overvoltage condition if the amplifier drives a mismatched load impedance. In response to the detected overvoltage condition, a clamping transistor lowers a reference DC bias voltage supplied by a bias circuit to the amplifier. The lowered reference DC bias voltage lowers amplifier gain and output power, thus protecting the amplifier.
REFERENCES:
patent: 3378781 (1968-04-01), Hill
patent: 3495179 (1970-02-01), Moss
patent: 3541457 (1970-11-01), Leighty et al.
patent: 3586991 (1971-06-01), Vosteen
patent: 3611174 (1971-10-01), Day
patent: 4061983 (1977-12-01), Suzuki
patent: 4077014 (1978-02-01), Satoh
patent: 4199797 (1980-04-01), Kusumi
patent: 4415803 (1983-11-01), Muoi
patent: 4417292 (1983-11-01), Borghese et al.
patent: 4578576 (1986-03-01), Wheeler et al.
patent: 4631737 (1986-12-01), Davis et al.
patent: 4644293 (1987-02-01), Kennett
patent: 4673886 (1987-06-01), Bickley et al.
patent: 4683443 (1987-07-01), Young et al.
patent: 4820995 (1989-04-01), Tamura
patent: 5015839 (1991-05-01), Tanikoshi
patent: 5136257 (1992-08-01), Reading
patent: 5179353 (1993-01-01), Miyake
patent: 5257285 (1993-10-01), Thorp
patent: 5300897 (1994-04-01), Shiga et al.
patent: 5423078 (1995-06-01), Epperson et al.
patent: 5493255 (1996-02-01), Murtojarvi
patent: 5884153 (1999-03-01), Okada
patent: 5977823 (1999-11-01), Inoue et al.
patent: 6201442 (2001-03-01), James et al.
patent: 6208209 (2001-03-01), Ng
patent: 6459340 (2002-10-01), Apel et al.
patent: 6580321 (2003-06-01), Arell et al.
patent: 6762647 (2004-07-01), Apel
patent: 2003/0045251 (2003-03-01), Arnott
Yamamoto et al. “A 3.2-V Operation Single-Chip Dual-Band A1GaAs/GaAs HBT MMIC Power Amplifier with Active Feedback Circuit Technique”, IEEE Journal of Solid-State Circuits, vol. 35, No. 8, Aug. 2000, pp. 1109-1120.
Bever Hoffman & Hams, LLP
Luu An T.
Tra Quan
TriQuint Semiconductor Inc.
LandOfFree
Active protection circuit for load mismatched power amplifier does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Active protection circuit for load mismatched power amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active protection circuit for load mismatched power amplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3679370