Tien-Ling Hsieh

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A broadband low-power down-converter that can rapidly scan the UWB spectrum within several tens of nano-seconds to detect large interferers, is presented. The detector employs cascaded image-reject stages, each consisting of harmonic-rejection mixers, and decomposes the spectrum into 16 equal sub-bands. The LO path uses a single HF input with integer(More)
This paper presents an interference detection technique based on analog spectral decomposition for a multi-band ultra wideband (UWB) radio system. The architecture utilizes a cascade of image-rejecting single-sideband mixers with fixed LO frequencies. The proposed technique can rapidly detect portions of the spectrum with the largest interference levels and(More)
This paper discusses the challenges in ultrawideband pulse radio transceiver design and proposes an architecture operating between 3.1 and 10.6 GHz to address them. The 7.5-GHz band is subdivided into multiple channels of 500 MHz each to relax the requirements for pulse generation, transceiver synchronization, and group-delay flatness. The pulse bases for(More)
An area-efficient oscillator topology for dual-band applications is proposed. The oscillator can be configured to operate in one of two states with distinct oscillation frequencies, and does not require a frequency divider for dual-band operation. A wide separation between the output frequencies can be achieved. The area and power requirements and phase(More)
Acknowledgements First of all I would like to express my sincerest gratitude to my supervisor, Dr. Ranjit Gharpurey, for his guidance and support throughout this project. After taking some courses on the Analog Circuit Design from him, I joined his group and started to work on various research topics. During the entire period of my stay in his research(More)
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