Title :
A CMOS 64MSps 20mA 0.85mm2 baseband I/Q modulator performing 13 bits over 2MHz bandwidth
Author :
Pinna, Carlo ; Mecchia, Alessandro ; Nicollini, Germano
Author_Institution :
Cellular Terminal Div., STMicroelectronics - Telecom Group, Milano, Italy
Abstract :
A CMOS 64MSps 2-1-1 cascaded ΣΔ I/Q modulator optimized for WCDMA applications achieves more than 13 bits over 2MHz bandwidth. A new way for sizing cascaded ΣΔ architectures based on comparator equivalent gain, and an improved dynamic element matching method resulted into an area and power efficient modulator design. The total consumption of two modulators plus built-in voltage and current reference generators is about 20mA at 2.7V. Total active area is 0.85mm2 in a 0.35 μm CMOS technology.
Keywords :
CMOS integrated circuits; code division multiple access; power consumption; sigma-delta modulation; 0.35 micron; 2 MHz; 2.7 V; 20 mA; CMOS 64MSps 20mA 0.85mm2 baseband I/Q modulator; cascaded ΣΔ I/Q modulator; comparator equivalent gain; dynamic element matching method; Bandwidth; Baseband; CMOS technology; Filters; Multi-stage noise shaping; Multiaccess communication; Quantization; Standards development; Telecommunications; Voltage;
Conference_Titel :
VLSI Circuits, 2004. Digest of Technical Papers. 2004 Symposium on
Print_ISBN :
0-7803-8287-0
DOI :
10.1109/VLSIC.2004.1346540
