After graduation, he worked in numerous well-known companies such as Delco, Lawrence Livermore Laboratory, Lockheed, Pacific Missile Range, Texas Instruments, and Schlumberger Well Services.
In 1980, professor Allen coauthored a book called Introduction to the Theory and Design of Active Filters.
Four years later coauthored another one called Switched Capacitor Circuits.
Currently he works as an editor for Integration-The VLSI Journal, and Analog Integrated Circuits and Signal Processing and is a fellow at the Institute of Electrical and Electronics Engineers.
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