Quan Ronald

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Ronald Quan has a BSEE degree from the University of California at Berkeley and is a member of SMPTE, IEEE, and the AES. He has worked as a broadcast engineer for FM and AM radio stations. Ron is the the author of “Build Your Own Transistor Radios”, a book that covers the theory and practice of radios, circuits, and signals and published by TAB. For over 30 years he has worked for companies related to video and audio equipment (Ampex, Sony, Macrovision, Monster Cable, and Portal Player). This included the design of wide band FM detectors for an HDTV tape recorder at Sony Corporation, and a twice color subcarrier frequency (7.16 MHz) differential phase measurement system for Macrovision, where he was a Principal Engineer. Also at Macrovision he designed several phase lock loop circuits to provide a clock signal from the raw EFM (eight-fourteen modulation) analog signal from a CD player’s photodiode preamplifier. At Hewlett Packard, he developed a family of low powered bar code readers, which drained a fraction of the power consumed by conventional light pen readers. Ron Quan holds at least 77 United States patents in the areas of analog video processing, low noise amplifier design, low distortion voltage controlled amplifiers, wide band crystal voltage controlled oscillators, video monitors, audio and video IQ modulation, in-band carrier audio single sideband modulation and demodulation, audio and video scrambling, bar code reader products, and audio test equipment. In 2005 he was a guest speaker at Stanford University Electrical Engineering Department’s graduate seminar, talking on lower noise and distortion voltage controlled amplifier topologies. Ron also presented papers at the November 2010 and October 2012 Audio Engineering Society conventions in San Francisco.

Written articles
Introduction to noise

Noise in audio circuits hampers the ability to listen to low level details in the signal. In particular, it degrades S/N ratio in low level signal circuits such as found in microphone, moving...

Experiments in Low Voltage Tube Audio Amplifier Circuits

We can very easily design RIAA phono and line preamplifier circuits with solid state devices such as FETs, ICs, and transistors with low voltages in the +/- 22 volt power supply range. Most...