Monolithic Analog Trigonometric Function Generator

AD639 Computes SIN, COS, TAN, Plus Reciprocal, Inverse, and Offset Functions; Complete and Self-Contained; SINE and COSINE Accuracy Specified over ±360°

The AD639 is an analog "trigonometric microsystem" on a single silicon chip, packaged in a 16-pin DIP. From a differential voltage input, representing an angle, (20mV/°), it can be pin-programmed to generate a voltage output, accurately determined by any of the standard functions—sine, cosine, tangent, secant, cosecant, and cotangent—as well as some lesser-known variants, such as the versine and exsecant, plus a corresponding set of inverse functions. Read full article


Barrie Gilbert

Barrie Gilbert

Barrie Gilbert, the first ADI Fellow, has “spent a lifetime in the pursuit of analog elegance.” He joined Analog Devices in 1972, was appointed ADI Fellow in 1979, and manages the Northwest Labs in Beaverton, Oregon. Barrie was born in Bournemouth, England, in 1937. Before joining ADI, he worked with first-generation transistors at SRDE in 1954, and at Mullard, Ltd.; later at Tektronix and Plessey Research Labs. Barrie is an IEEE Fellow (1984) and has received numerous awards. He has some 50 issued patents, has authored about 40 papers, is coauthor of several books, and is a reviewer for several journals. He was awarded an Honorary Doctorate of Engineering from Oregon State University in 1997.