NDLI: 9.9 V ASK Demodulator Using Differential Shaper for High-Impedance Electrode

Content Provider	Springer Nature Link
Author	Lee, Tzung Je
Copyright Year	2014
Abstract	This paper proposes a 9.9 V ASK demodulator for the high-impedance micro-stimulating electrode. In order to receive the 9.9 V ASK modulated signal, a cascoded HV rectifier is utilized to rectify the HV (high voltage) ASK modulated signal and generates a miniature rectified signal with voltage $$<$$ 3.3 V, such that the reliability problem can be avoided. Besides, a differential generator and a differential shaper are employed to amplify the miniature rectified signal. The theoretical analysis and the condition are given to guarantee the proposed ASK demodulator functionally working in all process and temperature corners. Besides, the aspect ratios of the MOS transistors can be easily found according to the analysis results. The simulation and measurement results are also given to verify the analysis results. Thus, the HV modulated signal could be demodulated easily without any off-chip step-down circuit, boost circuit and HV process required. The proposed design is carried out using TSMC 0.35 $$μ $$ m CMOS process. The core area is $$109.515 \times 56.925\,μ {\text {m}}^2$$ . The maximum data rate is measured to be 1.25 Mbps with the carrier frequency of 12.5 MHz.
Starting Page	2027
Ending Page	2042
Page Count	16
File Format	PDF
ISSN	0278081X
Journal	Circuits, Systems, and Signal Processing
Volume Number	33
Issue Number	7
e-ISSN	15315878
Language	English
Publisher	Springer US
Publisher Date	2014-03-14
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	ASK demodulator Biomedical Implantable High impedance High voltage Circuits and Systems Electrical Engineering Signal, Image and Speech Processing Electronics and Microelectronics, Instrumentation
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Signal Processing

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