Oscillators – Solid state active element oscillator – Transistors
Patent
1986-11-04
1990-12-04
Callahan, Timothy P.
Oscillators
Solid state active element oscillator
Transistors
331177V, 357 14, 357 15, 357 22, 357 41, 357 51, H03B 500, H01L 2702, H01L 2992
Patent
active
RE0334693
ABSTRACT:
A monolithic microwave voltage-controlled oscillator including one or more FETS integrated with a wide-ratio varactor. The varactor includes interdigitated anode and cathode patterns laid out on a single thin epitaxial layer. The punch through voltage of the epitaxial layer, and hence the resistivity-thickness product of the epitaxial layer, must be low. Since the substrate is semi-insulating, punch through to the substrate does not become uncontrollable, but simply permits modulation of the capacitance over a very wide range. The FETS are formed in the same epitaxial layer with the varactor, and complicated doping profiles are not required.
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Brehm Gailon E.
Scott Bentley N.
Callahan Timothy P.
Comfort James T.
Merrett N. Rhys
Sharp Melvin
Texas Instruments Incorporated
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