Title :
A Successive Approximation A/D Converter Using a PWM Modulator DAC
Author :
Della Colletta, Gustavo ; Ferreira, Luis H. C. ; Pimenta, Tales C. ; Crepaldi, Paulo C.
Author_Institution :
Grupo de Microeletronica, Univ. Fed. de Eng. de Itajuba-UNIFEI, Itajuba, Brazil
Abstract :
This paper presents a new SAR A/D conversion architecture that uses a PWM modulator and a first order low pass filter as alternative to conventional DAC implementations. Design equations were derived and a circuit implementation is proposed. In order to validate the proposed architecture, a 4bit successive approximation A/D converter has been designed and simulated. Then the circuit layout was developed in 0.5u m CMOS process with CADENCE Virtuoso. Post layout simulations were performed using BSIM3v3 model in Spectre simulator. DNL and INL erros are less then 0.1LSB. The power consumption is only 16u W for a 2.5V power supply.
Keywords :
CMOS digital integrated circuits; analogue-digital conversion; digital-analogue conversion; integrated circuit layout; low-pass filters; modulators; BSIM3v3 model; CADENCE Virtuoso; CMOS process; DNL error; INL error; PWM modulator DAC; SAR A-D conversion architecture; Spectre simulator; circuit implementation; circuit layout; conventional DAC implementation; design equations; first-order low-pass filter; post layout simulations; power 16 muW; size 0.5 mum; successive approximation A-D converter; voltage 2.5 V; ADC; PWM; Successive Aproximation;
Conference_Titel :
Electronics, Robotics and Automotive Mechanics Conference (CERMA), 2012 IEEE Ninth
Conference_Location :
Cuernavaca
Print_ISBN :
978-1-4673-5096-9
DOI :
10.1109/CERMA.2012.59
