Browsing by Author "Hu, Weibo"

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An Ultra-Low Power Interface CMOS IC Design for Biosensor Applications
(2012)
Hu, Weibo
;
Liu, Yen-Ting
;
Das, Vighnesh
;
Schecht, Cliff
;
Tam Nguyen
This paper presents a design example of an ultra-low power single-channel analog front-end (AFE) integrated circuits (IC) and system for biomedical sensing applications. The 0.18-mu m CMOS AFE IC design includes a low noise instrumentation amplifier (INA), a low-pass filter (LPF), a variable gain amplifier (VGA), and a successive approximation register (SAR) analog-to-digital converter (ADC). The AFE IC architecture is analyzed on the system level to minimize total power consumption with high integration and optimized for an ECG sensing system. SPICE simulations of the AFE IC channel validate the ultra-low power IC design methodology for heartbeat detection with less than 1 mu A/channel.
Arbitrary waveform generator based on direct digital frequency synthesizer
(2008)
Hu, Weibo
;
Lee, Chung Len
;
Wang, Xin\'an
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電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
Arbitrary Waveform Generator (AWG) is an important signal generation module in many applications such as communication and mixed signal testing. This paper describes an AWG based on Direct Digital Frequency Synthesizer (FFDS). The CORDIC algorithm with an iterative process and a pipeline plus parallel structure are used to implement the AWG whose frequencies and amplitudes of sinusoid waveforms in the arbitrary wave can be controlled by frequency control words (FCWs), initial vectors of CORDIC module respectively. Compared to the conventional AWG, it is flexible and saves much hardware.