Patent ID: 8817554

Claim:
An apparatus, comprising: a data line and a reference line; a precharge circuit configured to precharge the data line and the reference line during a precharge phase; a switch block having a data line input coupled to the data line, a reference data line input coupled to the reference line, a reference input, and a feedback input, the switch block further including a data line output, a reference data line output, a reference output, and a feedback output, during the precharge phase the switch block is configured to couple the reference input to the data line output, the reference data line output, and the reference output, further couple the feedback input to the feedback output, and further couple the data line output and the reference output to opposite sides of the first capacitance, during an evaluation phase the switch block is configured to couple the data line input to the data line output and further couple the reference data line input to the reference data line output; a first capacitance coupled to the data line output; a second capacitance coupled to the reference data line output; and a differential amplifier coupled to the first and second capacitances and configured to provide an output having a voltage level based at least in part on voltages provided from the data line output and the reference data line output of the switch block.