A 12 mW Low Power Continuous-Time Bandpass Delta Sigma Modulator With 58 dB SNDR and 24 MHz Bandwidth at 200 MHz IF

作者：Chae Hyungil^*; Jeong Jaehun; Manganaro Gabriele; Flynn Michael P

来源：IEEE Journal of Solid-State Circuits, 2014, 49(2): 405-415.

DOI：10.1109/JSSC.2013.2291713

• ADC
• bandpass
• continuous-time
• delta-sigma
• low power
• resonator
• single op-amp

A 800 MS/s low power fourth-order continuous-time bandpass Delta Sigma modulator (CTBPDSM) with 24 MHz bandwidth at a 200 MHz IF uses a novel power-efficient resonator with a single amplifier as a loopfilter. The single op-amp resonator employs positive feedback to increase the Q-factor. A new fourth-order architecture is introduced for system simplicity and power efficiency. Reducing the number of feedback DACs lowers the power consumption and simplifies the modulator structure. A prototype ADC achieves 58 dB SNDR, 60 dB DR and 65 dB IM3, with a total power consumption of 12 mW. The total die area in 65 nm CMOS is 0.2 mm(2).

• 出版日期2014-2