Patent ID: 7180354

Claim:
An improved receiver ( 20 ) connected to a driver via a bus ( 11 ) transporting an input differential signal (V P −V M ) represented by two states consisting of at least a low frequency section including a training pattern during a preliminary phase comprising: a sample and hold differential circuit ( 22 ) made of switches and two holding capacitors to which said input differential signal is applied to generate first and second differential signals, so that the first differential signal holds a first state and the second differential signal propagates the second state; first and second differential comparators ( 23 a , 23 b ), each having positive and negative inputs and a single output, that driven by said first and second differential signals and are configured to receive first and second offset compensation signals respectively; a third differential comparator ( 15 ) having positive and negative inputs and a single outPut that is driven by the respective output of said first and second comparators where the output signal (Vout) represents the differential offset minus the offset compensation; a successive approximation register (SAR) configured to receive said output signal which performs successive iterations to compute the offset compensation value, to digitize and store this value; a DAC ( 16 ) which applies this binary value converted in a first offset compensation signal and its complemented value (+/−Cor ofs) that are applied to said first and second comparators respectively for offset compensation; and, synchronization means (EN, OSW) for adequately activating said switches for sampling and memorizing the input differential signal in said holding capacitors further comprising a common mode control circuit ( 25 ) connected between its positive and negative inputs to said first and second comparators to generate a control signal and its inverted value that are applied to said first and second comparators respectively to improve their linearity for better accuracy.