Lucent Technologies Inc.

Nam Sung Woo

Maurice J Tarsia

Haideh Khorramabadi

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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New Providence, NJ, United States of America

Nam Sung Woo