Title :
Performance analysis of low oversampling ratio sigma-delta noise shapers for RF applications
Author :
Gothenberg, A. ; Tenhunen, H.
Author_Institution :
Dept. of Electron., R. Inst. of Technol., Stockholm, Sweden
Abstract :
Baseband signal processing for current base stations or 3rd generation mobile systems will impose high bandwidth and high VLSI integration demand. Many of the desired integration aspects can be satisfied with sigma-delta converter front-ends. However, under the technology constraints there are simultaneous requirements for high sample rate and low oversampling ratio in order to achieve the desired baseband width. In this paper, we present system architecture results for 4th-order cascaded noise shaper architectures for baseband front-ends and show that the cascaded structures with proper scaling will satisfy simultaneous demand on linearity (spurious free dynamic range) and high SQNR with low oversampling ratio based on usage of multibit quantizers outside the actual signal noise shaping path
Keywords :
CMOS integrated circuits; cascade networks; interference suppression; radio equipment; sigma-delta modulation; signal processing equipment; 4th-order noise shaper architectures; ADC; RF applications; base stations; baseband signal processing; cascaded structures; high sample rate; linearity; low oversampling ratio; multibit quantizers; performance analysis; sigma-delta converter front-ends; sigma-delta noise shapers; spurious free dynamic range; Bandwidth; Base stations; Baseband; Delta-sigma modulation; Multi-stage noise shaping; Performance analysis; Signal generators; Signal processing; Signal to noise ratio; Very large scale integration;
Conference_Titel :
Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on
Print_ISBN :
0-7803-4455-3
DOI :
10.1109/ISCAS.1998.704456
