Amplifiers – With periodic switching input-output
Patent
1998-12-11
2000-04-11
Shingleton, Michael B
Amplifiers
With periodic switching input-output
330253, 330257, H03F 102
Patent
active
060492465
ABSTRACT:
A differential amplifier circuit achieves offset cancellation by supplying an offset correction current from a current copier circuit to the output of the differential amplifier. The current copier is programmed by closing a first switch to short the differential input terminals of the amplifier, by opening a second switch to break the feedback loop of the amplifier, and by closing a third switch to allow the current copier to sense the offset output voltage at the output of the amplifier. The current copier generates an equal and opposite offset cancellation current which is summed with the offset current from the amplifier. The current copier circuit includes a storage capacitor for storing a voltage required to produce such offset cancellation current. After programming the storage capacitor, the third switch is opened, the first switch is opened, and the second switch is closed for normal operation.
REFERENCES:
patent: 3694760 (1972-09-01), Loessi
patent: 3748587 (1973-07-01), Aumiaux
patent: 3810031 (1974-05-01), Poujois
patent: 3988689 (1976-10-01), Ochi et al.
patent: 4068182 (1978-01-01), Dingwall et al.
patent: 4152659 (1979-05-01), Gordon
patent: 4306196 (1981-12-01), Dwarakanath et al.
patent: 4417160 (1983-11-01), Schade, Jr.
patent: 4491800 (1985-01-01), Miyata
patent: 4555668 (1985-11-01), Gregorian et al.
patent: 4697152 (1987-09-01), Westwick
patent: 5483194 (1996-01-01), Genest
patent: 5530399 (1996-06-01), Chambers et al.
patent: 5604464 (1997-02-01), Hwang et al.
Degrauwe, et al. "A Micropower CMOS-Instrumentation Amplifier", IEEE J. Solid-State Circuits, Jun. 1985, vol. SC-20, No. 3, pp. 805-807.
Allen-Holberg, "CMOS Analog Circuit Design," Holt, Rinehart & Winston, 1987 pp. 357-360.
Franca-Tsividis, "Design of Analog-Digital VLSI Circuits for Telecommunications and Signal Processing"; Prentice Hall 1994 (2.sup.nd Edition) pp. 108-112.
Gregorain-Temes, "Analog MOS Integrated Circuits," John Wiley & Sons, 1986, p. 416.
Ciccone Thomas W.
Kozisek James R.
Shingleton Michael B
Vivid Semiconductor, Inc.
LandOfFree
Amplifier offset cancellation using current copier does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Amplifier offset cancellation using current copier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Amplifier offset cancellation using current copier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1179775