Current-controlled carrier tracking filter for improved spurious

Pulse or digital communications – Receivers – Automatic frequency control

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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.
patent: 5117205 (1992-05-01), Natuta
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.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Current-controlled carrier tracking filter for improved spurious does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Current-controlled carrier tracking filter for improved spurious, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Current-controlled carrier tracking filter for improved spurious will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1517522

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.