Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2004-09-01
2009-10-13
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S310000
Reexamination Certificate
active
07602246
ABSTRACT:
A single-stage amplifier includes (1) first and second “gain” transistors coupled in a common source configuration, (2) first and second resistors providing self-biasing for the first and second transistors, respectively, (3) first and second current sources providing bias currents for the first and second transistors, respectively, and (4) a load impedance coupled between the drains of the first and second transistors. The amplifier may further include (5) third and fourth “compensation” transistors coupled in parallel with, and used to compensate parasitic capacitances of, the first and second transistors, respectively, and (6) third and fourth resistors providing self-biasing for the third and fourth transistors, respectively. Variable gain may be achieved by varying the bias currents for the gain transistors. A two-stage amplifier may be formed with two stages coupled in cascade, with each stage including most or all of the circuit elements of the single-stage amplifier.
REFERENCES:
patent: 5221909 (1993-06-01), Cole et al.
patent: 5374897 (1994-12-01), Moraveji
patent: 5465070 (1995-11-01), Koyama et al.
patent: 5489876 (1996-02-01), Pernici
patent: 5642077 (1997-06-01), Nagaraj
patent: 6069523 (2000-05-01), Brown
patent: 6118340 (2000-09-01), Koen
patent: 6486820 (2002-11-01), Allworth et al.
patent: 6753730 (2004-06-01), Yamamoto
patent: 6765377 (2004-07-01), Lu
patent: 6836185 (2004-12-01), Pobanz
patent: 2002/0097092 (2002-07-01), Aude
patent: 2003/0025562 (2003-02-01), Andreou et al.
patent: 2005/0099233 (2005-05-01), Zipper et al.
patent: 2005/0184805 (2005-08-01), Murakami
patent: 0620638 (1994-01-01), None
patent: 1394933 (2003-08-01), None
patent: 2002980 (1978-07-01), None
patent: 2319418 (1998-05-01), None
Zhang Xuejun
Zhou Jianjun
Hooks William M.
Pappas George C.
Pascal Robert
QUALCOMM Incorporated
Wong Alan
LandOfFree
General-purpose wideband 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 General-purpose wideband amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and General-purpose wideband amplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4120000