Philipus Chandra Oh

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Over the past decade, L-homophenylalanine is extensively used in the pharmaceutical industry as a precursor for production of angiotensin-converting enzyme (ACE) inhibitor, which possesses significant clinical application in the management of hypertension and congestive heart failure (CHF). A number of chemical methods have been reported thus far for the(More)
— A method of direct input reference feed-forward compensation is proposed and discussed for all digital phase locked loop based synthesizers. The practical issues in implementing the system are addressed, and analysis of the feed-forward estimation error on the system is performed. A sample model was created and simulated. Simulation shows the effect of(More)
SUMMARY Conventional clock and data recovery (CDR) using a phase locked loop (PLL) suffers from problems such as long lock time, low frequency acquisition and harmonic locking. Consequently, a CDR system using a time to digital converter (TDC) is proposed. The CDR consists of simple arithmetic calculation and a TDC, allowing a fully digital realization. In(More)
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