Title :
Analog blocks for high-speed oversampled A/D converters
Author :
Caiulo, Giuseppe ; Francesconi, Fabrizio ; Liberali, Valentino ; Maloberti, Franco
Author_Institution :
Italtel Soc. Italiana Telecommun. SpA, Milan, Italy
Abstract :
The design of high performance sigma-delta converters involves high frequency operation. This constraint means analog blocks must be carefully designed to meet these requirements. BiCMOS technology offers advantages with respect to CMOS in realising high-speed analog blocks. This paper describes an operational amplifier and a comparator designed in BiCMOS technology. Suitable circuit solutions have been used to obtain the required values for DC gain, gain-bandwidth product and slew-rate. High-level simulations of both low-pass and band-pass oversampled converters indicate that the blocks designed allow a faster clock rate than CMOS and are suitable for operation in switched-capacitor circuits with sampling rate of up to 40 MHz
Keywords :
BiCMOS analogue integrated circuits; comparators (circuits); operational amplifiers; sigma-delta modulation; switched capacitor networks; 280 MHz; 40 MHz; BiCMOS technology; DC gain; band-pass oversampled converters; clock rate; comparator; gain-bandwidth product; high-speed analog blocks; high-speed oversampled ADC; low-pass oversampled converters; operational amplifier; oversampled A/D converters; sigma-delta converters; slew-rate; switched-capacitor circuits; BiCMOS integrated circuits; CMOS technology; Circuit simulation; Clocks; Delta-sigma modulation; Frequency conversion; Operational amplifiers; Sampling methods; Switched capacitor circuits; Switching converters;
Conference_Titel :
Circuits and Systems, 1995., Proceedings., Proceedings of the 38th Midwest Symposium on
Conference_Location :
Rio de Janeiro
Print_ISBN :
0-7803-2972-4
DOI :
10.1109/MWSCAS.1995.510197
