Bell Telephone Laboratories

Edward H Nicollian

Alfred Yi Cho

Harold Seidel

George Elwood Smith

Horace C Casey, Jr

Disclosed is a feedback regulated oscillator which comprises a reference signal source, a variable local oscillator, a converter responsive to the variable local oscillator for developing a signal, compatible with the signal of the reference source, having a magnitude which is responsive to the frequency of the local oscillator, and a comparator, responsive to the reference signal source and to the converter, for controlling the frequency of the variable local oscillator.

Precision frequency source using integrated circuit elements

In a metal-insulator-semiconductor (MIS) structure, the I-layer comprises a single-crystal, semi-insulating layer which forms a substantially lattice-matched heterojunction with the underlying S-layer. Illustratively, the structure, grown by MBE, includes an indirect gap AlGaAs I-layer doped with a deep level impurity such as oxygen, iron or chromium, and a GaAs S-layer. GaAs FETs incorporating this MIS structure are described.

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Murray Hill, NJ, United States of America

Edward H Nicollian