Patent ID: 6960925
Filing Date: 2005-11-01
Classification: G01R,G11C,H03K

Abstract:
1. An apparatus comprising: a detector circuit adapted to receive an input signal, wherein a voltage magnitude of the input signal alternates between a first voltage level and a second voltage level, and wherein the detector circuit is configured to produce a first signal having a magnitude indicative of the first voltage level and a second signal having a magnitude indicative of the second voltage level; and an average generator circuit adapted to receive the first and second signals and configured to use the magnitudes of the first and second signals to produce a third signal having a magnitude indicative of a third voltage level substantially mid way between the first voltage level and the second voltage level, wherein the third voltage level defines a switching point, and wherein a first noise margin exists between the switching point and the first voltage level of the input signal, and wherein a second noise margin exists between the switching point and the second voltage level of the input signal, and wherein the switching point varies with changes in the first and second voltage levels of the input signal such that the first and second noise margins are maintained substantially equal.