Patent ID: 7250813

Claim:
An amplifier circuit having a main positive input terminal, a main negative input terminal, a main positive output terminal and a main negative output terminal, the amplifier circuit comprising: a first amplifier having a first positive input terminal and a first negative input terminal receiving differential input signals, and a first positive output terminal and a first negative output terminal providing differential output signals, the first amplifier having a first size; a second amplifier having a second positive input terminal and a second negative input terminal receiving differential input signals, and a second positive output terminal and a second negative output terminal providing differential output signals, the second amplifier having a second size; a first plurality of switching devices coupled to the first and second positive input terminals and the first and second negative input terminals, the first plurality of switching devices being controlled by a bistate control signal having a first state and a second state; and a second plurality of switching devices coupled to the first and second positive output terminals and the first and second negative output terminals, the second plurality of switching devices being controlled by the bistate control signal, wherein the bistate control signal is in the first state to cause the first and second pluralities of switching devices to configure the first amplifier and the second amplifier in a positive parallel configuration and the bistate control signal is in the second state to cause the first and second pluralities of switching devices to configure the first amplifier and the second amplifier in a negative parallel configuration, and when the bistate control signal switches states at each sample cycle of the amplifier circuit, the first amplifier and the second amplifier toggle between the positive parallel configuration and the negative parallel configurations to cancel out crosstalk signals stored at the positive and negative input terminals of the first and second amplifier circuit.