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System and method for bandwidth estimation of an integrated filter

Image Number 2 for United States Patent #6825713.

A system for estimating the bandwidth of a baseband filter that produces a phase shift on arriving analog signals is disclosed. The system comprises means for generating a digital reference clock signal and means for converting the digital reference clock signal into an analog reference clock signal to be input to the baseband filter. Phase comparison means are coupled to the baseband filter for comparing the digital reference clock signal to the analog reference clock signal phase shifted through the baseband filter. A digital pulsed signal that is representative of the phase shift is generated, and digital circuit means connected to the phase comparison means convert the digital pulsed signal into a digital value, the digital value being proportional to the phase shift of the baseband filter.

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