A Single-Stage 37 dB-Linear Digitally-Controlled Variable Gain Amplifier for Ultrasound Medical Imaging
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- Title
- A Single-Stage 37 dB-Linear Digitally-Controlled Variable Gain Amplifier for Ultrasound Medical Imaging
- Authors
- Cho, SE; Um, JY; Kim, B; Sim, JY; Park, HJ
- Date Issued
- 2014-10
- Publisher
- IEEK PUBLICATION CENTER
- Abstract
- This paper presents a variable gain amplifier (VGA) for an analog front-end (AFE) of ultrasound medical imaging. This VGA has a closed-loop topology and shows a 37-dB-linear characteristic with a single-stage amplifier. It consists of an op-amp, a non-binary-weighted capacitor array, and a gain-control block. This non-binary-weighted capacitor array reduces the required number of capacitors and the complexity of the gain-control block. The VGA has been fabricated in a 0.35-mu m CMOS process. This work gives the largest gain range of 37 dB per stage, the largest P1 dB of 9.5 dBm at the 3.3-V among the recent VGA circuits available in the literature. The voltage gain is controlled in the range of [-10, 27] dB in a linear-in-dB scale with 16 steps by a 4-bit digital code. The VGA has a bandpass characteristic with a passband of [20 kHz, 8 MHz].
- Keywords
- Variable gain amplifier; digitally controlled; non-binary-weighted capacitor array; ultrasound; analog front-end; medical imaging
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/13818
- DOI
- 10.5573/JSTS.2014.14.5.579
- ISSN
- 1598-1657
- Article Type
- Article
- Citation
- JOURNAL OF SEMICONDUCTOR TECHNOLOGY AND SCIENCE, vol. 14, no. 5, page. 579 - 587, 2014-10
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