A 110W Single-Bit Continuous-Time ΔΣ Converter with 92.5dB Dynamic Range
A third-order single-bit CT-ΔΣ modulator for generic biomedical applications is implemented in a 0.15-μm FD-SOI CMOS process. The overall power efficiency is attained by employing a single-bit quantizer and thus avoiding the mismatch shaping logic. The loop filter coefficients are determined using a systematic design centering approach by accounting for the integrator non-idealities. The single-bit CT-ΔΣ modulator consumes 110μW power from a 1.5-V power supply when clocked at 6.144MHz. The simulation results for the modulator exhibit a dynamic range of 94.4 dB and peak SNDR of 92.4 dB for 6 kHz signal bandwidth. The figure of merit (FoM) of this third-order, single-bit CT-ΔΣ modulator is 0.271pJ/level.
Balagopal, Sakkarapani; Roy, Rajaram Mohan; and Saxena, Vishal. (2010). "A 110W Single-Bit Continuous-Time ΔΣ Converter with 92.5dB Dynamic Range". Proceedings of the 2010 IEEE Dallas Circuits and Systems Workshop (DCAS), Oct. 17-18 2010, Piscataway, NJ, . http://dx.doi.org/10.1109/DCAS.2010.5955028