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- Title
High-PSRR Wide-Range Supply-Independent CMOS Voltage Reference for Retinal Prosthetic Systems.
- Authors
Zawawi, Ruhaifi Bin Abdullah; Choi, Hojong; Kim, Jungsuk
- Abstract
This paper presents a fully integrated voltage-reference circuit for implantable devices such as retinal implants. The recently developed retinal prostheses require a stable supply voltage to drive a high-density stimulator array. Accordingly, a voltage-reference circuit plays a critical role in generating a constant reference voltage, which is provided to a low-voltage-drop regulator (LDO), and filtering out the AC ripples in a power-supply rail after rectification. For this purpose, we use a beta-multiplier voltage-reference architecture to which a nonlinear current sink circuit is added, to improve the supply-independent performance drastically. The proposed reference circuit is fabricated using the standard 0.35 µm technology, along with an LDO that adopts an output ringing compensation circuit. The novel reference circuit generates a reference voltage of 1.37 V with a line regulation of 3.45 mV/V and maximum power-supply rejection ratio (PSRR) of −93 dB.
- Subjects
VOLTAGE references; ARTIFICIAL implants; INTEGRATED circuits; VOLTAGE-controlled oscillators; PROSTHETICS; OPTICAL coherence tomography
- Publication
Electronics (2079-9292), 2020, Vol 9, Issue 12, p2028
- ISSN
2079-9292
- Publication type
Article
- DOI
10.3390/electronics9122028