Circuit, including feedback, for reducing DC-offset and...

Details Circuit, including feedback, for reducing DC-offset and... Circuit, including feedback, for reducing DC-offset and...

2005-06-28

2005-06-28

Choe, Henry (Department: 2817)

Amplifiers

With periodic switching input-output

C330S069000, C327S124000

Reexamination Certificate

active

06911864

ABSTRACT:
An amplifier (AMP) is provided with a pair of choppers (CHPi,CHPo) in order to reduce the DC-offset and the noise produced by the amplifier (AMP). To obtain an optimal noise reduction the pair of choppers (CHPi,CHPo) operate on a high frequency. As a result the DC-offset cancellation is not optimal because a so-called charge injection of the switches in the pair of choppers (CHPi,CHPo) produces a DC-offset. To overcome this problem the amplifier (AMP) is further provided with further offset cancellation means which are for example formed by a further pair of choppers (CHPfi,CHPfo). This further pair of choppers (CHPfi,CHPfo) operates on a relatively low frequency. The combination of the pair of choppers (CHPi,CHPo) and the further pair of choppers (CHPfi,CHPfo) guarantees an optimal DC-offset cancellation as well as an optimal noise cancellation.

REFERENCES:
patent: 4048574 (1977-09-01), Barbier et al.
patent: 4210872 (1980-07-01), Gregorian
patent: 4430622 (1984-02-01), Simoes
patent: 4714843 (1987-12-01), Smith
patent: 4939516 (1990-07-01), Early
patent: 5206602 (1993-04-01), Baumgartner et al.
patent: 5585756 (1996-12-01), Wang
patent: 5600275 (1997-02-01), Garavan
patent: 5663680 (1997-09-01), Nordeng
patent: 5736895 (1998-04-01), Yu et al.
patent: 5751154 (1998-05-01), Tsugai
patent: 5793243 (1998-08-01), Farrow
patent: 6313685 (2001-11-01), Rabii
patent: 6509777 (2003-01-01), Razavi et al.

Affiliated with

Also associated with

Rating

Circuit, including feedback, for reducing DC-offset and... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuit, including feedback, for reducing DC-offset and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit, including feedback, for reducing DC-offset and... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3509123