Title :
A comparison design of delta-sigma modulators
Author :
Tan, Nianxiong ; Eriksson, Sven
Author_Institution :
Dept. of Electr. Eng., Linkoping Univ., Sweden
Abstract :
In this paper, we present a comparison design of second-order delta-sigma modulators based on operational amplifiers and unity-gain buffers. Compared with those using operational amplifiers, the delta-sigma modulators using unity-gain buffers have some attractive features, such as higher frequency operation, reduced capacitance spread, etc. A test chip containing two modulators using operational amplifiers and using unity-gain buffers was implemented in a 0.8 μm double-metal CMOS process. Measurement results confirmed the better performance of the modulator using unity-gain buffers
Keywords :
CMOS integrated circuits; sigma-delta modulation; 0.8 micron; capacitance spread; design; double-metal CMOS process; high frequency operation; operational amplifiers; second-order delta-sigma modulators; unity-gain buffers; CMOS process; Capacitance; Capacitors; Circuits; Clocks; Delta modulation; Digital filters; Frequency; Operational amplifiers; Parasitic capacitance; Quantization; Semiconductor device measurement; Switches; Testing;
Conference_Titel :
Circuits and Systems, 1994., Proceedings of the 37th Midwest Symposium on
Conference_Location :
Lafayette, LA
Print_ISBN :
0-7803-2428-5
DOI :
10.1109/MWSCAS.1994.519025
