Patent ID: 8184184
Filing Date: 2012-05-22
Classification: H04N

Abstract:
1. An analog multiplexer for multiplexing a plurality of input analog signal channels into a single output analog signal channel, the multiplexer comprising: a plurality of input sampling circuits associated with respective ones of the input analog signal channels, the input sampling circuits each comprising positive and negative inputs coupled to respective positive and negative differential signal lines of a corresponding input analog signal channel; and a differential amplifier having positive and negative inputs controllably connectable in turn to each of the input sampling circuits; wherein the analog multiplexer is further configured to connect the positive and negative inputs of a given input sampling circuit to respective first plates of respective first and second sampling capacitors at a predetermined time prior to connecting respective second plates of the first and second sampling capacitors to the respective positive and negative inputs of the differential amplifier; wherein the predetermined time is less than a full clock cycle of a sampling clock of the amplifier; and wherein the given input sampling circuit comprises: