Autozero technique for a phase locked loop system

Details Autozero technique for a phase locked loop system Autozero technique for a phase locked loop system

1996-12-27

2000-02-15

Le, Amanda T.

Pulse or digital communications

Receivers

Automatic baseline or threshold adjustment

375345, 375346, 330285, 330291, 330 98, 4552511, H04B 112

Patent

active

060261277

ABSTRACT:
An autozero method and system that cancels offset for use in an AMI or like system and that operates while data is being transmitted and does not require a retraining sequence. The system applies the offset correction feedback in a unique way inside the traditional feedback loop. The system also provides a unique method of introducing offset correction into an analog feedback loop prior to the last gain stage such that the offset cancellation point is inside the feedback loop. This allows a straight forward implementation which does not have to compensate for the offset change due to the gain of the last stage. A digital control system allows the AGC and the autozero to be active in the same feedback loop and to interact with no adverse affects during the transmission of data.

REFERENCES:
patent: 5503770 (1996-04-01), Mayer et al.
patent: 5550512 (1996-08-01), Fukahori
patent: 5566213 (1996-10-01), Carsello
patent: 5757219 (1998-05-01), Weedon et al.

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