US Patent 7554477 Amplifier array circuits and flash analog to digital converters

An amplifier array circuit is provided. An amplifier array includes a main amplifier array comprising a plurality of first amplifiers and a plurality of reference voltages, wherein the first amplifier is coupled to an input signal and the reference voltage corresponding to the first amplifier. A first reversed reference voltage amplifier array is located on one side of the main amplifier array and has a plurality of second amplifiers coupled to the input signal and the reference voltages, respectively. A second reversed reference voltage amplifier array is located on the other side of the main amplifier array and has a plurality of third amplifiers coupled to the input signal and the reference voltages respectively. The averaging network is coupled to a first output terminal and a second output terminal of the first, second and third amplifiers.