Title :
A CMOS programmable gain amplifier with a novel DC-offset cancellation technique
Author :
Chu, Xiaojie ; Lin, Min ; Gong, Zheng ; Shi, Yin ; Dai, Fa Foster
Author_Institution :
Semicond. Integrated-Technol. Res. Center, Suzhou-CAS, Suzhou, China
Abstract :
A programmable gain amplifier (PGA) with a novel DC offset cancellation (DCOC) technique for IEEE 802.11b/g wireless LAN direct-conversion receiver (DCR) is presented. An operational amplifier (OPAMP) utilizing an improved Miller compensation approach is adopted in this PGA design. A gain tuning range of 0 dB to 56 dB with 2 dB per step is achieved. The DCOC loop is based on a voltage-current negative feedback that includes a switchable bandwidth algorithm to speed up the settling time of DCOC. The proposed approach requires no external components and demonstrates excellent DCOC capability in measurement. Fabricated in a 0.13 μm CMOS technology, this PGA dissipates 9.7 mW from a 1.2 V supply voltage and occupies an area of 0.17 mm2.
Keywords :
CMOS integrated circuits; DC-DC power convertors; feedback; network analysis; operational amplifiers; programmable circuits; wireless LAN; CMOS programmable gain amplifier; DC-offset cancellation technique; Miller compensation; gain 0 dB to 56 dB; operational amplifier; power 9.7 mW; size 0.13 mum; voltage 1.2 V; voltage-current negative feedback; wireless LAN direct-conversion receiver; Bandwidth; Electronics packaging; Gain; Noise figure; Receivers; Switches; Tuning;
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2010 IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4244-5758-8
DOI :
10.1109/CICC.2010.5617453