English to French Tech/Engineering Electronics / Elect Eng (in a patent) CONTINUOUS-TIME OVERSAMPLED CONVERTER HAVING ENHANCED IMMUNITY TO NOISE

The term “notch" refers to a narrow frequency range where the transfer function of the filter either goes to zero or is greatly attenuated. By placing the notches 154 in the same frequencies as phase noise spurs on the clock signal 1 1 2, the noise mixed into the baseband by noise spurs can be significantly attenuated.

The filter transfer function can have a notch, and the programmable coefficients can be selected to match the notch frequency to the frequency o f the noise signal or a component of the noise signal.

The clock source can include a phase-locked loop having a reference clock operating at a reference clock frequency, and the notch in the first filter transfer function can have a frequency that matches the reference clock frequency or a harmonic of the reference clock frequency.

The apparatus can include a clock source that generates a clock signal in which a phase noise peak may be added to a noise level o f the clock signal as the clock signal is generated and/or routed, in which the first filter transfer function includes a notch that occurs at a frequency that matches the frequency of the noise peak.