H - Electricity – 03 – B
Patent
H - Electricity
03
B
H03B 5/08 (2006.01) H01L 27/06 (2006.01) H01L 29/20 (2006.01) H01L 29/76 (2006.01) H01L 29/93 (2006.01) H03B 5/18 (2006.01) H03B 1/00 (2006.01) H03B 1/04 (2006.01)
Patent
CA 2067046
Abstract of the Disclosure The oscillating apparatus according tho this invention comprises a pulse doped FET 1, and a series feedback capacitor 2 connected to the source of the pulse doped FET 1, the pulse doped FET is a FET formed on a pulse doped epitaxial layer including a channel layer 23 with a high carrier density, and a cap layer 24 with a low carrier density formed on the channel layer 23. The series feedback capacitor 2 is a variable capacitor whose capacitance value increases when a gate bias voltage of the pulse doped FET 1 is changed toward increase a drain current of the pulse doped FET 1. Consequently it is possible to reduce phase noises by controlling only the gate bias with an oscillation frequency set at a required value. As a result, the merits of the MMIC can be sufficiently utilized without the necessity of externally adding a dielectric resonator.
Marks & Clerk
Sumitomo Electric Industries Ltd.
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