Title :
A new low power 2-2 cascaded sigma-delta modulator with the reduced number of op-amps for GSM transceiver applications
Author :
Safarian, Amin Q. ; Vahidfa, M.B. ; Aslanzadeh, H. ; Mehrmanesh, S.
Author_Institution :
California Univ., Irvine, CA, USA
Abstract :
A new single-bit cascaded 2-2 Σ/Δ (Sigma-Delta) modulator with only two op-amps, instead of four ones in conventional modulators, to decrease the static power consumption and area, is designed for GSM transceiver applications. The circuit consists of two new single op-amp, second-order, and low-pass loop filters to achieve a fourth-order quantization noise shaping. The modulator shows 84dB DR (Dynamic Range) for GSM signal bandwidth, while consuming 2.3mW from a 2.5V supply voltage.
Keywords :
cascade networks; cellular radio; low-power electronics; modulators; operational amplifiers; quantisation (signal); sigma-delta modulation; transceivers; 2-2 cascaded sigma-delta modulator; GSM transceiver; class-AB op amp; fourth-order quantization noise shaping; low power modulator; low-pass loop filters; reduced number of op amps; single-bit modulator; static power consumption; transfer function; Circuits; Delta modulation; Delta-sigma modulation; Energy consumption; GSM; Low pass filters; Noise shaping; Operational amplifiers; Quantization; Transceivers;
Conference_Titel :
Electronics, Circuits and Systems, 2003. ICECS 2003. Proceedings of the 2003 10th IEEE International Conference on
Print_ISBN :
0-7803-8163-7
DOI :
10.1109/ICECS.2003.1302028
