Chi-Tung Chang

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  • Ahmadreza Rofougaran, Glenn Chang, Jacob J Rael, James Y, C Chang, Maryam Rofougaran +6 others
  • 1998
— A 900-MHz direct-conversion receiver to detect a frequency-hopped carrier with frequency shift keying (FSK) modulation at 160 kb/s is integrated on the same chip as the transmitter. The receiver combines a low-noise amplifier with downconversion mixers and low-pass channel-select filters in quadrature channels. A digital correlating detector makes the(More)
In this paper, we proposed a high data rate, low-power, and large random jitter tolerance wideband signaling (WBS) transceiver for human body channel communication (BCC). At the transmitter part, a spread spectrum clock generator is applied to reduce the electromagnetic emission. Subsequently, the proposed WBS transmitter uses a NRZI encoding scheme to(More)
  • Ahmadreza Rofougaran, Glenn Chang, Jacob J Rael, James Y, C Chang, Maryam Rofougaran +6 others
  • 1998
—A single-chip transceiver for frequency-hopped code division multiple access (CDMA) in the 900 MHz industrial, scientific and medical (ISM) band is implemented in 1-m CMOS. It combines a digital frequency synthesizer, a double quadrature upconverter, an integrated oscillator, and a power amplifier with variable output. Data modulates a carrier hopping at(More)
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