Title :
Sigma delta A/D converter architecture using a current controlled oscillator
Author :
Khitouni, Nizar ; Boujelben, S. ; Masmoudi, Mohamed
Author_Institution :
Dept. of Electr. Eng., Nat. Sch. of Eng. of Sfax, Sfax
Abstract :
This paper proposes a new architecture for an over sampling sigma-delta analog to digital converter using a current controlled oscillator (CCO). The converter consists of a CCO, two analog integrator, and a feedback D-to-A converter. Through functional and circuit simulations, an SNR of over 100 dB was obtained at 8 kHz signal bandwidth and 2.048 MHz sampling frequency. The architecture of over sampling A/D converter was used for audio and low voltage system-on chip applications. The CCO is simulated using CMOS 0.35 mum technology and a 2.5 V voltage supply.
Keywords :
CMOS integrated circuits; analogue-digital conversion; circuit simulation; low-power electronics; radiofrequency oscillators; sigma-delta modulation; system-on-chip; CMOS technology; analog integrator; audio system-on-chip application; bandwidth 8 kHz; circuit simulation; current controlled oscillator; feedback D-to-A converter; frequency 2.048 MHz; low voltage system-on-chip application; sampling frequency; sigma delta A/D converter architecture; sigma-delta analog-to-digital converter; signal bandwidth; size 0.35 mum; voltage 2.5 V; Analog-digital conversion; Bandwidth; CMOS technology; Circuit simulation; Delta-sigma modulation; Feedback; Frequency; Low voltage; Oscillators; Sampling methods;
Conference_Titel :
Electronics, Circuits and Systems, 2005. ICECS 2005. 12th IEEE International Conference on
Conference_Location :
Gammarth
Print_ISBN :
978-9972-61-100-1
Electronic_ISBN :
978-9972-61-100-1
DOI :
10.1109/ICECS.2005.4633494
