The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 09, 1999
Filed:
Jul. 14, 1995
Haideh Khorramabadi, Chatham Township, Morris County, NJ (US);
Maurice J Tarsia, Colonia, NJ (US);
Nam Sung Woo, New Providence, NJ (US);
Lucent Technologies Inc, Murray Hill, NJ (US);
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.