A Low-Power Delta-Sigma Modulator Using a Charge-Pump Integrator

作者：Nilchi Alireza^*; Johns David A

来源：IEEE Transactions on Circuits and Systems I-Regular Papers, 2013, 60(5): 1310-1321.

DOI：10.1109/TCSI.2012.2220462

• ADC
• charge-pump integrator
• chopper-stabilization
• delta-sigma modulator
• low-power
• oversampling
• switched-capacitor
• thermal noise limited circuits

In this paper a low-power switched-capacitor integrator based on a capacitive charge-pump (CP) is presented, and its practical effects are discussed. The CP integrator is employed as the first stage of a Delta Sigma ADC. The 0.13 mu m CMOS prototype of the CP based ADC achieves the same performance as a conventional ADC while consuming 66% lower OTA power in the front-end integrator. The CP based modulator realizes 87.8 dB SNDR, 89.2 dB SNR and 90 dB DR over a 10 kHz bandwidth with 148 mu W power consumption. The conventional ADC has similar performance but dissipates 241 mu W. The energy required per conversion-step for the CP based ADC (0.369 pJ/step) is almost 40% lower than that of the conventional ADC (0.607 pJ/step).

• 出版日期2013-5