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Digitally programmable decibel-linear CMOS VGA for low-power mixed-signal applications
2000 (English)In: IEEE transactions on circuits and systems. 2, Analog and digital signal processing (Print), ISSN 1057-7130, E-ISSN 1558-125X, Vol. 47, no 5, 388-398 p.Article in journal (Refereed) Published
Abstract [en]

A new technique for realizing CMOS digitally controlled decibel-linear variable gain amplifier (VGA) circuits is described. CMOS VGA circuits employing the proposed technique are then given. Besides being effective and simple to use from a system point of view, the VGA circuits offer a stable gain characteristic with precise gain control that is achievable without component spreading, The VGA provides a 25 dB gain control range per stage, with 0.55-dB gain steps and a gain error of less than 0.5 dB. It can also be digitally reconfigured to give a 60-dB gain control range with 6-dB gain steps. The VGA circuit provides digital offset trimming, processes voltage or current input signals and operates in a fully differential configuration. Simulation and experimental results are provided.

Place, publisher, year, edition, pages
2000. Vol. 47, no 5, 388-398 p.
Keyword [en]
current division network, current sensed op amp, decibel-linear, variable gain amplifier, converter
Identifiers
URN: urn:nbn:se:kth:diva-19771ISI: 000087128800002OAI: oai:DiVA.org:kth-19771DiVA: diva2:338463
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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Ismail, Mohammed
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