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

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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 \(\upmu \)m CMOS process. The core area is \(109.515 \times 56.925\,\upmu {\text {m}}^2\). The maximum data rate is measured to be 1.25 Mbps with the carrier frequency of 12.5 MHz.

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Acknowledgments

This research was partially supported by National Science Council under Grant NSC 100-2218-E-230-001, NSC 100-2221-E-230-026, and NSC 101-2632-E-230-001-MY3. Besides, the authors would like to express their deepest gratefulness to CIC (Chip Implementation Center) of NARL (National Applied Research Laboratories), Taiwan, for their thoughtful chip fabrication service.

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  1. Department of Computer Science and Information Engineering, Cheng Shiu University, No. 840, Chengcing Rd., Niaosong Dist., Kaohsiung City , 83347, Taiwan

    Tzung-Je Lee

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Lee, TJ. 9.9 V ASK Demodulator Using Differential Shaper for High-Impedance Electrode. Circuits Syst Signal Process 33, 2027–2042 (2014). https://doi.org/10.1007/s00034-014-9755-z

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