Title :
A new fourth-order single-loop delta-sigma modulator for audio applications
Author :
Çoban, Abdulkerim L. ; Allen, Phillip E.
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
In this paper, a fourth-order single-loop delta-sigma modulator with a new loop topology is presented. The loop-filter is composed of both feedback and feedforward paths. No active summing element is required in the modulator implementation. The modulator has low integrator output swings and high input dynamic range, resulting in relaxed op amp requirements even for low voltage operation. Simulation results indicate that, 94.5 dB peak S/(N+D) is achievable at a clock rate of 2.56 MHz for a 20 kHz baseband. A prototype of the modulator has been fabricated in a 1.2 μm CMOS process and it is currently under test
Keywords :
CMOS integrated circuits; audio equipment; circuit feedback; feedforward; sigma-delta modulation; 1.2 micron; 2.56 MHz; CMOS process; audio applications; feedback; feedforward; fourth-order single-loop delta-sigma modulator; input dynamic range; integrator output swing; loop-filter; low voltage operation; op amp; simulation; Baseband; CMOS process; Clocks; Delta modulation; Dynamic range; Feedback loop; Low voltage; Operational amplifiers; Prototypes; Topology;
Conference_Titel :
Circuits and Systems, 1996. ISCAS '96., Connecting the World., 1996 IEEE International Symposium on
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-3073-0
DOI :
10.1109/ISCAS.1996.539984
