Analog to Information Converter with Random Demodulation Based on SAR ADC

Compressed sampling theory (CS) states that the sparsity of the signal can be used to reduce the conversion rate and save energy. Devices that implement this approach are called analog-to-information converters (AIC). Usually CS frameworks require dedicated analog CS encoders built by power-hungry active amplifiers, which limit the overall power saving. In this paper is considered the implementation of AIC with random demodulation based on a successive-approximation-register analog-to-digital converter (SAR ADC). CS framework uses passive capacitive digital-to-analog converter (DAC). This approach allows to implement AIC as an auxiliary mode for the main ADC.