A highly linear 125-MHz CMOS switched-resistor programmable-gain amplifier

Author

Hsu, Cheng-Chung ; Wu, Jieh-Tsorng

Author_Institution

Dept. of Electron. Eng., Nat. Chiao-Tung Univ., Hsin-Chu, Taiwan

Volume

38

Issue

10

fYear

2003

Firstpage

1663

Lastpage

1670

Abstract

A highly linear programmable-gain amplifier (PGA) is fabricated using a 0.35-μm CMOS technology. High linearity and constant wide bandwidth are achieved by using a high-gain amplifier with low input impedance and resistor-network feedback. The voltage gain is varied by digitally controlling the input switched resistors. The distortion of a switched resistor has been analyzed using the Volterra series. The PGA has a voltage gain varying from 0 to 19 dB, while maintaining a constant bandwidth of 125 MHz. The third-order intermodulation distortion is -86dB at 10 MHz. The circuit dissipates 21 mW from a 3.3-V supply.

Keywords

CMOS analogue integrated circuits; Volterra series; feedback amplifiers; intermodulation distortion; programmable circuits; switched networks; wideband amplifiers; 0 to 19 dB; 0.35 micron; 10 MHz; 125 MHz; 21 mW; 3.3 V; CMOS programmable gain amplifier; Volterra series; bandwidth; digital control; input impedance; intermodulation distortion; linearity; resistor-network feedback; switched resistor; voltage gain; Bandwidth; CMOS technology; Digital control; Electronics packaging; Feedback; Impedance; Intermodulation distortion; Linearity; Resistors; Voltage control;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/JSSC.2003.817665

Filename

1233753