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A 0.5-V, 440-µW Frequency Synthesizer for Implantable Medical Devices

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3 Author(s)
Wu-Hsin Chen ; Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA ; Wing-Fai Loke ; Byunghoo Jung

An ultra-low-power, low-voltage frequency synthesizer designed for implantable medical devices is presented. Several design techniques are adopted to address the issues in ultra-low voltage and current design. The charge pump (CP) in the synthesizer utilizes dynamic threshold-voltage and switch-coupled techniques to provide a high driving current with a low standby current. The synthesizer adopts a ring-based voltage controlled oscillator (VCO) that utilizes a dual resistor-varactor tuning technique to compensate for process-voltage-temperature (PVT) variations and the exponential voltage-to-current curve. Implemented in a 0.13-μm CMOS technology, the 0.5-V medical-band frequency synthesizer consumes 440 μW while exhibiting a phase noise of 91.5 dBc/Hz at 1-MHz frequency offset.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:47 ,  Issue: 8 )