Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1998-03-05
2000-09-05
Le, Dinh T.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327557, 330305, H03K 500
Patent
active
061149020
ABSTRACT:
A frequency tracking arrangement in which a frequency tracking circuit utilizes a continuously variable analogue first order all-pass filter circuit as a controllable phase-shift element in a closed-loop system which produces a control signal to control the phase shift circuit to introduce a 90.degree. phase shift of a received reference frequency signal when the circuit is tracking that reference frequency. The control signal may then be utilized to slave the cut-off frequency of a filter and/or the delay time introduced by a delay line.
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INSPEC Abstract of Journal Article: A 27 MHz Programmable Bipolar 0.05 Degrees Equiripple Linear-Phrase Lowpass Filter, by Veirman, et al., 1992 IEEE International Solid State Circuits Conference. Digest of Technical Papers. 39th ISSCC (Cat. No. 92CH3128-6) P. 64-5, 244, IEEE, 1992, New York, USA.
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INSPEC Abstract of Journal Article: An Integrated Continuous-Time Filters For Video Frequencies, by Johl, et al., in Journal Mitteilungen Agen No. 45, p. 31-8, Jun 1987, Switzerland.
Beatson Trevor P
Boddy David I
Fenney Brendan P
Mihailovits Nicholas
Le Dinh T.
Mitel Semiconductor Limited
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