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J. Low Power Electron. Appl. 2016, 6(1), 4; doi:10.3390/jlpea6010004

A 300-mV ΔΣ Modulator Using a Gain-Enhanced, Inverter-Based Amplifier for Medical Implant Devices

School of Electrical Engineering and Computer Science, Oregon State University, 1148 Kelley Engineering Center, Corvallis, OR 97331, USA
Academic Editor: Emre Salman
Received: 30 September 2015 / Revised: 2 March 2016 / Accepted: 8 March 2016 / Published: 11 March 2016
(This article belongs to the Special Issue Implantable Bio-Electronic Circuits and Systems)
View Full-Text   |   Download PDF [2231 KB, uploaded 11 March 2016]   |  

Abstract

An ultra-low-voltage low-power switched-capacitor (SC) delta-sigma (ΔΣ) modulator running at a supply voltage as low as 300 mV is presented for biomedical implant devices, e.g., cardiac pacemakers. To reduce the supply voltage, an inverter-based amplifier is used in the integrators, whose DC gain and gain-bandwidth (GBW) are boosted by a simple current-mirror output stage. The full input-feedforward loop topology offers low integrators internal swing, supporting ultra-low-voltage operation. To demonstrate the concept, a second-order loop topology was chosen. The entire modulator operates reliably against process, voltage and temperature (PVT) variations from a 300 mV ± 10% supply voltage only, while the switches are driven by a charge pump clock boosting scheme. Designed in a 65 nm CMOS technology and clocked at 256 kHz, the simulation results show that the modulator can achieve a 64.4 dB signal-to-noise ratio (SNR) and a 60.7 dB signal-to-noise and distortion ratio (SNDR) over a 1.0 kHz signal bandwidth while consuming 0.85 μW of power. View Full-Text
Keywords: delta-sigma modulator; gain-enhanced inverter-based amplifier; biomedical implant devices; clock boosting; ultra-low voltage; low power delta-sigma modulator; gain-enhanced inverter-based amplifier; biomedical implant devices; clock boosting; ultra-low voltage; low power
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Fazli Yeknami, A. A 300-mV ΔΣ Modulator Using a Gain-Enhanced, Inverter-Based Amplifier for Medical Implant Devices. J. Low Power Electron. Appl. 2016, 6, 4.

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J. Low Power Electron. Appl. EISSN 2079-9268 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
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