Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2007-09-18
2007-09-18
Nguyen, Khanh Van (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S069000, C330S252000
Reexamination Certificate
active
11730976
ABSTRACT:
In a differential amplifier and an operational amplifier each for amplifying a signal, a differential signal composed of first and second signals is inputted to a couple of input terminals (1, 2). When the voltage of the first signal is, e.g., less than the voltage value of a reference voltage source (15), a comparator (13) senses it and a switch circuit (12) switches to a first current source (6) and a current from a third current source (11) flows into the first current source (6) so that a current is inhibited from flowing in the first differential couple (4). As a result, the inputted differential signal is amplified and outputted only through a second differential couple (5). In a situation in which the voltage of the first signal exceeds the voltage of the reference voltage source (15), on the other hand, the switch circuit (12) switches to a current source (7) so that the inputted differential signal is amplified and outputted only through the first differential couple (4). As a result, a gain is equal over the entire range of input operating voltage and a high-speed operation is performed.
REFERENCES:
patent: 4918398 (1990-04-01), Huijsing et al.
patent: 5886578 (1999-03-01), Miyashita et al.
patent: 6559687 (2003-05-01), Hunt
patent: 7126419 (2006-10-01), Miyasita
patent: 6-169227 (1994-06-01), None
patent: 8-18354 (1996-01-01), None
patent: 8-18355 (1996-01-01), None
patent: 9-74322 (1997-03-01), None
patent: 11-500883 (1999-01-01), None
patent: 6-90125 (2004-03-01), None
patent: WO97/06595 (1997-02-01), None
patent: 11-355066 (1999-12-01), None
Tamai, Tokumichi., “Semiconductor Circuit Design Technology.” Nikkel BP, Inco., First Edition, Nov. 16, 1990, pp. 308-311 (Including Partial English Translation).
Gray, Paul, R., et al. “Analysis and Design of Analog Integrated Circuits.” John Wiley & Sons, Inc. Third Edition. Chapter 3, Single Transistor and Two-Transistor Amplifiers, 1993, pp. 244-249.
Ozasa Masayuki
Yokoyama Akio
Matsushita Electric - Industrial Co., Ltd.
McDermott Will & Emery LLP
Nguyen Khanh Van
LandOfFree
Differential amplifier and operational 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 Differential amplifier and operational amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Differential amplifier and operational amplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3770491