Title :
A High-Linearity, 60-dB Variable Gain Amplicier with Dual DC-Offset Cancellation for UWB Systems
Author :
Cheng, J. ; Huang, F.Y. ; Wu, L.H. ; Tian, Y. ; Jiang, N.
Author_Institution :
RF&OEIC Res. Inst., South-east Univ., Nanjing, China
Abstract :
A fully differential variable gain amplifier (VGA) for ultra-wideband (UWB) systems has been designed in a standard 0.18 mum CMOS process. The VGA is implemented using three variable gain stages followed by a fixed gain amplifier stage with a dual feedback DC-offset cancellation network to correct DC-offset. The proposed VGA shows a high linear gain range of 60 dB (0.7 dB-60.7 dB) at 650 MHz, drawing 8.9 mA with a 1.8 V power supply. The VGA chip occupies only 0.23 mm2 (0.47 mmtimes0.47 mm) active area.
Keywords :
CMOS analogue integrated circuits; UHF amplifiers; UHF integrated circuits; circuit feedback; differential amplifiers; integrated circuit design; low-power electronics; ultra wideband technology; UWB system; current 8.9 mA; dual feedback DC-offset cancellation network; frequency 650 MHz; gain 0.7 dB to 60.7 dB; high-linearity differential variable gain amplifier; size 0.18 mum; ultra-wideband system; voltage 1.8 V; Bandwidth; Communication system control; Computer architecture; Differential amplifiers; Feedback circuits; Gain; Hemorrhaging; Negative feedback; Voltage; Wireless communication;
Conference_Titel :
Wireless Communications, Networking and Mobile Computing, 2009. WiCom '09. 5th International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-3692-7
Electronic_ISBN :
978-1-4244-3693-4
DOI :
10.1109/WICOM.2009.5303327
