A 1-V transient-free and DC-offset-canceled PGA with a 17.1-MHz constant bandwidth over 52-dB control range in 0.35-/spl mu/m CMOS

Author

Mak, Pui-In ; U, Seng-Pan ; Martins, R.P.

Author_Institution

Analog & Mixed-Signal VLSI Lab., Macau Univ., Macao

fYear

2005

fDate

21-21 Sept. 2005

Firstpage

649

Lastpage

652

Abstract

Two circuit techniques, namely switched-current-resistor (SCR) and switchable DC-offset canceler (S-OC) inside opamp, are proposed to realize a low-voltage, transient-free and constant-bandwidth programmable-gain amplifier (PGA) with also adaptive stage-DC-offset cancellation. Fabricated in 0.35-mum CMOS, the PGA dissipates 7.4mW from 1V. The mean and standard deviation of the bandwidth over 52-dB gain range are 17.1 MHz and 8.3%, respectively. The SFDR is 56.2dB. The transient in a 52-dB-gain step settles within 0.2mus

Keywords

CMOS integrated circuits; HF amplifiers; operational amplifiers; switched current circuits; 0.2 mus; 0.35 micron; 1 V; 17.1 MHz; 56.2 dB; 7.4 mW; CMOS circuits; DC-offset-canceled PGA; adaptive stage-DC-offset cancellation; mean deviation; operational amplifier; programmable-gain amplifier; standard deviation; switchable DC-offset canceler; switched-current-resistor; transient-free PGA; Bandwidth; CMOS analog integrated circuits; Electronics packaging; Feedback; Impedance; Resistors; Switches; Switching circuits; Thyristors; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Custom Integrated Circuits Conference, 2005. Proceedings of the IEEE 2005

Conference_Location

San Jose, CA

Print_ISBN

0-7803-9023-7

Type

conf

DOI

10.1109/CICC.2005.1568753

Filename

1568753