Title :
A 1 V second order sigma-delta modulator
Author :
Grech, I. ; Micallef, J. ; Debono, C.J. ; Malcovati, P. ; Maloberti, F.
Author_Institution :
Dept. of Microelectron., Malta Univ., Msida, Malta
Abstract :
A second order switched capacitor sigma-delta modulator operating at a supply voltage of 1 V is presented. The design relies on the elimination of critical switches by using a modified switched op-amp for the integrator and novel switched half-supply and reference voltage generators. The design has been carried out in a fully differential configuration in order to minimize errors arising from charge injection and clock-feedthrough effects. The converter has been implemented using a conventional 0.8 μm double-poly double-metal CMOS process and test results, showing more than 9 bits of resolution with oversampling ratio of 64, are presented
Keywords :
CMOS integrated circuits; low-power electronics; modulators; sigma-delta modulation; switched capacitor networks; 0.8 micron; 1 V; ADC; SC sigma-delta modulator; clock-feedthrough effects; double-poly double-metal CMOS process; fully differential configuration; integrator; low supply voltage; modified switched op-amp; reference voltage generators; second order sigma-delta modulator; switched capacitor type; switched half-supply; Clocks; Delta-sigma modulation; Laboratories; Low voltage; Microelectronics; Operational amplifiers; Switched capacitor circuits; Switches; Switching circuits; Threshold voltage;
Conference_Titel :
Electronics, Circuits and Systems, 1999. Proceedings of ICECS '99. The 6th IEEE International Conference on
Conference_Location :
Pafos
Print_ISBN :
0-7803-5682-9
DOI :
10.1109/ICECS.1999.814457
