Amplifiers – With periodic switching input-output
Patent
1988-05-11
1989-02-21
Mullins, James B.
Amplifiers
With periodic switching input-output
330 69, 330259, H03F 345
Patent
active
048068756
ABSTRACT:
The precision operational amplifier of the invention has at least two stages, a first input differential stage and a second high gain stage having its input coupled to the output of the first stage. A digital control circuit coupled to the output of the second stage is used to supply a correction signal to the first stage, the correction signal being calculated to compensate for the offset voltage of the first stage. A digital representation of the correction signal is stored so that it may continuously be applied to the first stage, whereby the offset voltage of the first stage is substantially reduced and such reduction can be maintained for long periods of times. In a preferred embodiment, the digital circuit supplies a second independent correction signal to the second stage. That signal is also stored so that it may continuously be applied to the second stage, whereby the offset voltage of the second stage is substantially reduced and that reduction too can be maintained for long periods of time. The circuit of the invention may be contained in a single chip, monolithic integrated circuit.
REFERENCES:
patent: 4229703 (1980-10-01), Bustin
patent: 4356450 (1982-10-01), Masuda
patent: 4395681 (1983-07-01), Hornung et al.
patent: 4490682 (1984-12-01), Poulo
patent: 4554511 (1985-11-01), Braun
patent: 4667153 (1987-05-01), Doyle
Maxim Integrated Products
Mullins James B.
LandOfFree
Precision 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 Precision operational amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Precision operational amplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1525125