Low voltage analog digital converter using sigma-delta modulator

This paper proposes low voltage, low power discrete sigma-delta modulator for DVB-H. Full-feedforward structure and double sampling technique were used in order to achieve low voltage and wide bandwidth. To overcome the noise folding problem, generated when double sampling technique is applied, fully floating DAC is used. Simulated results of the modulator, designed in a 0.18 mum CMOS technology, achieves a 58 dB SNDR in a 4 MHz bandwidth and dissipates 8 mW from a 1.2 V supply.