Smart DC offset correction loop

Details Smart DC offset correction loop Smart DC offset correction loop

2000-05-22

2003-09-23

Ghayour, Mohammad H. (Department: 2634)

Pulse or digital communications

Receivers

Automatic baseline or threshold adjustment

C375S318000, C375S345000

Reexamination Certificate

active

06625232

ABSTRACT:

TECHNICAL FIELD
This invention relates to techniques and apparatus for carrying out correction of DC offsets in electronic circuits. This invention is especially suitable for situations where rapid DC offset correction is desirable.
BACKGROUND OF THE INVENTION
Many electronic circuits require correction of DC offsets. Radio receivers, including direct conversion receivers and Zero IF (ZIF) receivers, along with radio transmitters as well as other types of electronic devices often require that a DC offset be corrected in order to permit proper operation of the device. When a DC offset is present, it can be amplified by direct coupled amplifiers to distort the signal being processed or even saturate the amplifiers' output at their supply limits, thus rendering the device inoperable. Therefore, DC offsets normally have to be corrected or compensated in some manner.
The requirements for such correction vary depending upon the application. For example, in certain applications for DC offset correction, there is a requirement that the speed of settling the DC offset correction loop be very fast. For example, in GSM radio receivers, the DC offset correction circuit must be settled to within ±30 mV maximum total error within 400 &mgr;S at the output of the baseband filter. This is a very stringent requirement which has proven challenging to meet. Even under circumstances where rapid correction is not required by a specification, it is desirable to minimize down time and optimize radio performance.


REFERENCES:
patent: 4380005 (1983-04-01), Debord et al.
patent: 5844941 (1998-12-01), Mack et al.
patent: 6006079 (1999-12-01), Jaffee et al.
patent: 6411098 (2002-06-01), Laletin
patent: 6529237 (2003-03-01), Tsay et al.

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