Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2007-03-27
2007-03-27
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
C327S552000
Reexamination Certificate
active
11157945
ABSTRACT:
Direct incorporation of transmission zeros into a continuous-time active complex BP filter transfer function yields a filter having much sharper roll-off than that of an all-pole filter. The ladder filter is constructed using transconductors and capacitors only. The filter center frequency, its bandwidth and positions of transmission zeros can be electronically varied using tunable transconductors. The positions of zeros are changed by modifying cross-coupled differential transconductors connected between capacitors in parallel with the series inductors. Since all transconductors used in the filter are electronically tunable an automatic tuning system conveniently adjusts the filter center-frequency and its Q-factor.
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Le Dinh T.
Locke Liddell & Sapp LLP
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