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- Title
A large dynamic-range, high dB-linearity VGA using switch arrays and second-order mismatch-shaping DEM technique.
- Authors
Li, Di; Yang, Yintang; Shi, Zuochen; Jing, Zhan
- Abstract
A new large dynamic-range variable gain amplifier (VGA) with improved dB linearity is presented. The traditional cascade VGA has the disadvantages of gain mismatch between sub-stages and difficulty of employing mismatch cancelation or suppression algorithms. In this paper, switch arrays were used to make the sub-stages or called gain cells in the coarse-tuning stage (CTS) work independently and therefore prevent the integral operation of the gain errors. Then, a second-order mismatch-shaping DEM was applied conveniently to the CTS and shown to be a useful design technique in improving the dB-linearity performance. The cascade VGA and its second-order mismatch-shaping DEM had been integrated in a 2.4-GHz receiver chip which was fabricated in a 0.18-µm CMOS technology with a supply voltage of 1.8 V. Measurement results showed that the gain errors were significantly reduced with second-order mismatch-shaping DEM with respect to the traditionally thermometric decoding over a temperature range of [−40, 80] °C. Copyright © 2015 John Wiley & Sons, Ltd.
- Subjects
ELECTRONIC amplifiers; DECIBELS; ELECTRIC switchgear; COMPLEMENTARY metal oxide semiconductors; DIGITAL elevation models
- Publication
International Journal of Circuit Theory & Applications, 2016, Vol 44, Issue 3, p693
- ISSN
0098-9886
- Publication type
Article
- DOI
10.1002/cta.2101