Effect of impedance of reference source on successive approximation ADC dynamic performance

The paper presents the description and analysis of a phenomenon, relating with successive approximation ADCs dynamic performance degradation due to the influence of impedance of the circuit that connects the reference source with the switched capacitors' common bus. The paper provides a detailed analysis of this phenomenon and demonstrates methods to mitigate its impact on the performance on switched-capacitor based ADCs. These methods have been used to design ADC that features 10-bit resolution, 1 Msps throughput, 0.4 mW power consumption, and an effective resolution of 9.85 bits when converting 333 kHz input signal.