Low-Power Digitally Controlled CMOS Source Follower Variable Attenuator

T. Hui Teo; Wooi Gan Yeoh; IEEE

doi:10.1109/ISCAS.2007.378318

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Low-Power Digitally Controlled CMOS Source Follower Variable Attenuator

T. Hui Teo, Wooi Gan Yeoh and IEEE

2007 IEEE International Symposium on Circuits and Systems (ISCAS), pp.229-232

05/2007

DOI: https://doi.org/10.1109/ISCAS.2007.378318

Abstract

Attenuation

Attenuators

Bandwidth

Circuits

Communication system control

Digital control

Gain control

Impedance

Transconductance

Wideband

A low-power source follower variable attenuator (SFVA) is proposed and implemented using standard 0.18 μ m CMOS. Using a PMOS source follower, a bandwidth of 200MHz is achieved with 500 μ A current from a 1.8V single supply. Accurate attenuation can be varied with a digital control signal. Dc coupling at the input is made possible with a self-biasing technique. A single stage SFVA with a 2-bit control is demonstrated for 0dB to 6dB attenuation. The number of control bit and attenuation is expandable. The active area is merely 120 μ m × 60 μ m which is very cost effective.

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Title: Low-Power Digitally Controlled CMOS Source Follower Variable Attenuator
Creators - without role: T. Hui Teo - Institute of Microelectronics
Wooi Gan Yeoh - Institute of Microelectronics
IEEE
Publication Details: 2007 IEEE International Symposium on Circuits and Systems (ISCAS), pp.229-232
Publisher: IEEE
Number of pages: 4
Identifiers: 9912415609846
Academic Unit: EPD Pillar
Language: English
Resource Type: Conference proceeding

Low-Power Digitally Controlled CMOS Source Follower Variable Attenuator

Abstract

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