Title :
A 110µW single bit audio continuous-time oversampled converter with 92.5 db dynamic range
Author :
Pavan, Shanthi ; Sankar, Prabu
Author_Institution :
Indian Inst. of Technol., Madras, Chennai, India
Abstract :
The first integrator in a low pass continuous-time DeltaSigma modulator normally consumes significant power due to stringent noise and linearity requirements, especially in single-bit designs. We introduce the ldquoassisted opamp integratorrdquo that addresses this problem. The efficacy of our technique is borne out by measurements from a 15 bit audio converter designed in a 0.18 mum CMOS technology. It achieves 92.5 dB dynamic range in a 24 kHz bandwidth and dissipates 110 muW from a 1.8 V supply. The Figure of Merit (FOM) of this modulator is 66.5 fJ/level.
Keywords :
CMOS digital integrated circuits; audio equipment; continuous time systems; delta-sigma modulation; integrating circuits; operational amplifiers; CMOS technology; DeltaSigma modulator; assisted opamp integrator; bandwidth 24 kHz; continuous-time delta-sigma modulation; power 110 muW; single bit audio continuous-time oversampled converter; size 0.18 mum; voltage 1.8 V; CMOS technology; Circuits; Clocks; Dynamic range; Filters; Jitter; Linearity; Noise reduction; Power dissipation; Quantization;
Conference_Titel :
ESSCIRC, 2009. ESSCIRC '09. Proceedings of
Conference_Location :
Athens
Print_ISBN :
978-1-4244-4354-3
DOI :
10.1109/ESSCIRC.2009.5325953
