Oscillators – Solid state active element oscillator – Significant distributed parameter resonator
Reexamination Certificate
2005-11-22
2005-11-22
Le, Dinh T. (Department: 2816)
Oscillators
Solid state active element oscillator
Significant distributed parameter resonator
C331S17700V, C331S03600C
Reexamination Certificate
active
06967540
ABSTRACT:
A synthesizer incorporating voltage tunable capacitors, comprising at least one resonator coupled into a base circuit of a bipolar transistor, the at least one resonator including at least one voltage tunable capacitor; the bipolar transistor including a collector which terminates in a radial micro strip stub and an emitter which produces an output via an impedance matching circuit, a buffer amplifier and an RF filter; a frequency divider, programmable phase locked loop and loop filter receiving the output of the RF filter and providing the input to a controller; an integral switch mode power supply providing power to the base circuit via a first power supply filter, and the controller via a second power supply filter. The controller scales the user-selected control voltage range to the levels required by the voltage tunable capacitors associated with the at least one resonator.The resonator of the synthesizers incorporating parascan™ varactors of the present invention can be at least one at micro strip resonator and the bipolar transistor can be a Si-bipolar transistor. The emitter of the bipolar transistor is further terminated into a short-circuited micro strip stub, thus preventing lower modes of oscillation to exist. The present invention can further comprise a buffer amplifier or circulator associated with the impedance matching circuit to reduce the pulling effect where needed. Also, the present invention can further comprise a buffer amplifier in the output circuit to amplify the output power where needed. In a preferred embodiment of the present invention the controller can be a simple one-transistor controller and the controller can have a user-specified frequency response, thus aiding integration with phase-locked loop synthesizers.
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Finn James S.
Le Dinh T.
Paratek Microwave Inc.
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