A low-power digitally-programmable accurate decibel-linear CMOS VGA for UWB systems

Author

Jia, Bin ; Chen, Guican ; Zhang, Hong

Author_Institution

Dept. of Microelectron., Xian Jiaotong Univ., Xian

fYear

2008

fDate

8-10 Dec. 2008

Firstpage

1

Lastpage

4

Abstract

A new current-mode circuit for realizing CMOS digitally controlled decibel-linear variable gain amplifier (VGA) is proposed for ultra-wideband systems. The core block of this VGA is a series of programmable current-amplifier cells which are connected by a switch array. Some cells can be cut off under certain gain modes to save the power. Designed in 0.18..m CMOS technology, the VGA provides a 45d B gain range (from 7 dB to 52 dB) with 3 dB per step and a gain error of less than 0.1 dB, and its minimal bandwidth is 285 MHz with a load capacitor of 0.5 pF. The VGA consumes only 6.6-mW on average (from 4.85-8.35 mW), and the range of IIP3 is from -11 dBm to -40 dBm.

Keywords

CMOS integrated circuits; programmable circuits; wideband amplifiers; CMOS digitally controlled decibel-linear variable gain amplifier; UWB systems; current-mode circuit; gain error; gain modes; load capacitor; programmable current-amplifier cells; ultrawideband systems; Bandwidth; CMOS digital integrated circuits; CMOS technology; Capacitors; Control systems; Current mode circuits; Digital control; Gain; Switches; Ultra wideband technology;

fLanguage

English

Publisher

ieee

Conference_Titel

Electron Devices and Solid-State Circuits, 2008. EDSSC 2008. IEEE International Conference on

Conference_Location

Hong Kong

Print_ISBN

978-1-4244-2539-6

Electronic_ISBN

978-1-4244-2540-2

Type

conf

DOI

10.1109/EDSSC.2008.4760693

Filename

4760693