Patent ID: 9048860
Filing Date: 2015-06-02
Classification: H03M

Abstract:
1. An apparatus, comprising: an analog-to-digital converter (“ADC”) configured for successive approximations; wherein the ADC comprises a digital-to-analog converter (“DAC”), a comparator, and a control block; wherein the DAC is coupled to receive a first reference input signal and a feedback input signal to provide an analog output signal; wherein the analog output signal is capacitively coupled to an analog input node through a capacitor; wherein the analog input node is coupled through a switch to sample an analog input signal; wherein the capacitor is coupled between an output port of the DAC and a first input port of the comparator to provide capacitive coupling therebetween; wherein the first input port of the comparator is further coupled to the analog input node; wherein a second input port of the comparator is coupled to receive a second reference input signal; wherein the comparator is coupled to provide a comparator output signal to the control block; wherein the control block is configured for successive approximations to provide a digital output signal to a digital output node; and wherein the DAC is coupled to the digital output node to receive the digital output signal as the feedback input signal.