Pulse or digital communications – Receivers – Automatic frequency control
Patent
1996-02-23
1999-09-14
Chin, Stephen
Pulse or digital communications
Receivers
Automatic frequency control
331117, 327 65, 327553, H04L 2706
Patent
active
059533790
ABSTRACT:
Spurious energy suppression for a data communication system is achieved without using a large order noise suppression filter, by means of a post-mixer tracking filter that contains a current-controlled MOSFET-implemented resistance for a transconductance-capacitance filter and an associated transconductance tuning stage. The MOSFET-implemented resistance is controlled by the same control current that establishes the output frequency. As a result, the cut-off frequency of the tracking filter is linearly proportional to the carrier and independent of absolute processing parameters and temperature.
REFERENCES:
patent: 4737968 (1988-04-01), Norton et al.
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patent: 5345119 (1994-09-01), Khoury
patent: 5430337 (1995-07-01), Castello et al.
patent: 5625317 (1997-04-01), Deveirman
"Design of Continous-Time Fully Integrated Filters: A Review", by Prof. R. Schaumann, IEEE Proceedings, vol. 136, Pt. T. No. 4, Aug., 1989, pp. 184-190.
"A 4-MHz CMOS Continous-time Filter with On-Chip Automatic Tuning", by Francois Krummenacher and Norbert Joehl; IEEE Journal Of Solid-State Circuits, vol. 23, No. 3, Jun., 1988, pp. 750-758.
Godfrey Paul J.
Myers Brent A.
Chin Stephen
Harris Corporation
Liu Shuwang
Wands Charles E.
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