Accurate dB-Linear Variable Gain Amplifier With Gain Error Compensation
SCIE
SCOPUS
- Title
- Accurate dB-Linear Variable Gain Amplifier With Gain Error Compensation
- Authors
- Choi, I; Seo, H; Kim, B
- Date Issued
- 2013-02
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Abstract
- This paper describes use of a novel exponential approximation for designing dB-linear variable gain amplifiers (VGAs). The exponential function is accurately generated using a simple error-compensation technique. The dB-linear gain is controlled linearly by the gate voltage, resulting in a simple and robust VGA. The proposed dB-linear VGA fabricated in a 65-nm CMOS process achieves a total variable gain range of 76 dB and dB-linear range greater than 50 dB with +/- 0.5-dB gain error. Under a 1.2-V supply voltage, the current consumption of the VGA is 1.8 mA and that of the output buffer is 1.4 mA. The input-referred in-band noise density is 3.5 nV/root Hz and the in-band OIP3 is 11.5 dBm. Due to the very simple circuit topology, the total active area of the VGA and the output buffer is extremely small, 0.01 mm(2).
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/27133
- DOI
- 10.1109/JSSC.2012.2227606
- ISSN
- 0018-9200
- Article Type
- Article
- Citation
- IEEE JOURNAL OF SOLID-STATE CIRCUITS, vol. 48, no. 2, page. 456 - 464, 2013-02
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