Title :
A 110μW single-bit continuous-time ΔΣ converter with 92.5dB dynamic range
Author :
Balagopal, Sakkarapani ; Roy, Rajaram Mohan ; Saxena, Vishal
Author_Institution :
Electr. & Comput. Eng., Boise State Univ., Boise, ID, USA
Abstract :
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.
Keywords :
CMOS integrated circuits; biomedical electronics; continuous time systems; delta-sigma modulation; filtering theory; medical signal processing; power supply circuits; quantisation (signal); silicon-on-insulator; FD-SOI CMOS process; FoM; bandwidth 6 kHz; dynamic range; figure of merit; generic biomedical applications; integrator nonideality; loop filter coefficients; mismatch shaping logic; noise figure 92.5 dB; overall power efficiency; peak SNDR; power 110 muW; power supply; signal bandwidth; single-bit continuous-time ΔΣ converter; single-bit quantizer; size 0.5 mum; systematic design centering approach; third-order single-bit CT-ΔΣ modulator; voltage 1.5 V; Bandwidth; Delay; Dynamic range; Modulation; Noise; Operational amplifiers; Systematics; Analog-to-digital converter (ADC); continuous-time delta-sigma; data converter; delta-sigma modulation; oversampling;
Conference_Titel :
Circuits and Systems Workshop (DCAS), 2010 IEEE Dallas
Conference_Location :
Richardson, TX
Print_ISBN :
978-1-4244-9535-1
Electronic_ISBN :
978-1-4244-9534-4
DOI :
10.1109/DCAS.2010.5955028
