Design of Low Power Sigma Delta ADC
A low power discrete time sigma delta ADC consisting of a second order sigma delta modulator and third order Cascaded Integrated Comb (CIC) filter is proposed. The second order modulator is designed to work at a signal band of 20KHz at an oversampling ratio of 64 with a sampling frequency of 2.56MHz. It achieves a signal to noise ratio of 85.2dB and a resolution of 14-bits. The CIC digital filter is designed to implement a decimation factor of 64, operating at a maximum sampling frequency of 2.56MHz.