Shu-Ya Li

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Publications (2)0 Total impact

  • Conference Proceeding: Low Power Frequency-Shift Keying Demodulators for Biomedical Implants
    Ro-Min Weng, Shu-Ya Li, Jing-Chyi Wang
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    ABSTRACT: This Low power frequency-shift keying (FSK) demodulators are presented for the biomedical implants. Two FSK demodulators are designed with different concepts. The analog FSK (A-FSK) demodulator is composed of a single balance mixer, a square wave generator, a charge pump circuit, and a comparator to achieve the demodulation. The other digital FSK (D-FSK) demodulator employs only one block which the output signals for stimulating can be obtained simply and directly. Both demodulators are implemented by tsmc 1P6M CMOS process at IV supply voltage. A-FSK demodulator occupies chip area of 0.016 mm<sup>2</sup> . The data rate is 2.5Mbps while receiving 2.5MHz/5MHz FSK carrier signals. While receiving 5MHz/10MHz FSK carrier signals, the data rate of the D-FSK demodulator is up to be 5Mbps. The D-FSK demodulator occupies 0.004mm<sup>2</sup>. The power consumption of the A-FSK and D-FSK demodulators are 0.47mW and 0.022mW, respectively.
    Electron Devices and Solid-State Circuits, 2007. EDSSC 2007. IEEE Conference on; 01/2008
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    Conference Proceeding: A Low Power Folded Mixer Using Even Harmonic Technology
    Ro-Min Weng, Jing-Chyi Wang, Shu-Ya Li, Hung-Che Wei
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    ABSTRACT: A CMOS down-conversion folded mixer for the radio frequency (RF) applications is presented. The proposed mixer composes of frequency doubling circuits, transconductance stages, and folded switching stages. With input 1.9 GHz RF signals of -40 dBm driven by 0.948 GHz local oscillation (LO) signals of 0 dBm, the mixer shows a good performance in both the high linearity and the low power consumption. The third-order input intercept point (IIP3) and the power consumption including the buffer stage are -3dBm and 6.4mW, respectively. The proposed mixer is designed and fabricated by tsmc 0.18mum 1P6M CMOS process with the size of 0.989 x 0.559mm<sup>2</sup>.
    Radio-Frequency Integration Technology, 2007. RFIT 007. IEEE International Workshop on; 01/2008
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