Dual ADC Driver with Tightly Matched Gain and Phase Raises Quadrature Demodulation Performance

High speed differential amplifiers help to drive high performance analog-to-digital converters (ADCs) by providing balanced drive to the differential input stage, setting the common mode level, absorbing the sampling-energy, and taking gain to reduce the output swing requirement of preceding circuitry. In applications involving multiple ADCs, a compact, tightly matched dual differential amplifier such as the LTC6420-20 can further simplify the design by reducing the uncertainty of channel-to-channel variations.