Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1995-07-14
1999-11-09
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327552, 327557, 327558, 327559, 330305, H04B 116
Patent
active
059822287
ABSTRACT:
The present invention provides an apparatus and method of tuning the frequency characteristics of a continuous-time filter. First and second test signals are provided to a filter means and the respective first and second responses of the filter means are measured. The first and second responses are compared and based on the comparison a tuning control signal is provided to the filter means to tune the frequency response characteristics of the filter means. During a tuning phase of operation, a first switch connects a test signal generator and disconnects a data signal generator from the transmission input of a continuous-time filter. A signal processor receives a signal from the transmission output from the continuous-time filter and produces a tuning control signal based on that signal. The test signal generator is comprised of means for providing a first test signal, which may be an alternating signal source ("A.C."), and means for providing a second test signal, which may be a direct signal source ("D.C."). The signal processor compares the signal from the transmission output of the filter during a direct signal phase with the signal from the transmission output of the filter during an alternating signal phase and produces the tuning control signal based on the comparison.
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Khorramabadi Haideh
Tarsia Maurice J.
Woo Nam Sung
Callahan Timothy P.
Le Dinh T.
Lucent Technologies Inc
Tencza, Jr. Walter J.
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