A SAR ADC With a MOSCAP-DAC.

The linearity of the vast majority of the ADC topologies is limited by the linearity of the circuit elements employed in their design, such as resistors and capacitors. This paper presents a charge-mode SAR ADC architecture that uses only highly nonlinear metal-oxide-semiconductor capacitors (MOSCAPs) as the DAC capacitance elements. The non-linearity of the MOSCAPs is exploited to improve the tol...