Patent ID: 7994863

Claim:
An apparatus comprising: a circuit to generate a floating first supply voltage, wherein during operation of the circuit the first supply voltage tracks a common mode voltage of first and second input signals, wherein the circuit is further configured to generate a second supply voltage and, during operation of the circuit, the second supply voltage tracks the common mode voltage; a first amplifier having a first voltage input terminal coupled to the circuit to receive the first supply voltage and a second voltage terminal to receive the second supply voltage, wherein during operation the first amplifier receives and amplifies the first input signal to generate a first amplified input signal; a second amplifier having a first voltage input terminal coupled to the circuit to receive the first supply voltage and a second voltage terminal to receive the second supply voltage, wherein during operation the second amplifier receives and amplifies the second input signal to generate a second amplified input signal; and an analog-to-digital converter, the analog-to-digital converter comprising: an input sampling circuit coupled to the first amplifier and the second amplifier to sample the first and second amplified input signals and substantially eliminate the common mode voltage from the first and second amplified input signals.