Patent ID: 8878587

Claim:
An analog-to-digital converter (ADC) circuit including a fully-differential ADC and an interface circuit for driving the fully-differential ADC, the interface circuit being configured to receive a first input voltage and a second input voltage, and further configured to provide a first output voltage and a second output voltage, the interface circuit comprising: a first circuit configured to receive the first and second input voltages, and provide a voltage at an output of the first circuit; the first circuit is configured to decrease the voltage at the output of the first circuit in response to an increase in an average value of the first and second input voltages; a first network configured to receive the first input voltage and the voltage at the output of the first circuit, and further configured to provide the first output voltage; the first network being characterized by a first impedance ratio; and a second network configured to receive the second input voltage and the voltage at the output of the first circuit, and further configured to provide the second output voltage; the second network being characterized by a second impedance ratio substantially matched to the first impedance ratio.