Patent ID: 7092180

Claim:
Apparatus, comprising an asymmetry-changing circuit adapted to (i) process a first signal having positive and negative pulses and characterized by a first asymmetry and (ii) based on the first signal, generate a second signal having positive and negative pulses and characterized by a second asymmetry different from the first asymmetry, wherein: the second signal is generated by providing a signal contribution corresponding to a higher-than-second order of the first signal; the first signal has positive and negative pulses of different amplitudes; the second signal has positive and negative pulses of substantially uniform amplitudes; the asymmetry-changing circuit comprises an asymmetry-reducing circuit adapted to process the first signal and, based on the first signal, generate the second signal, wherein the second signal is generated by providing a signal contribution corresponding to a third order of the first signal; and the asymmetry-reducing circuit comprises: a differential amplifier having two differential inputs and two differential outputs, wherein the second signal appears at the differential outputs; and a plurality of MOS devices connected to the differential inputs and outputs such that conductance of the MOS devices provides input and feedback resistances to the differential amplifier.