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US 6,297,708 B1Granted
Temperature compensated high performance oscillator
AssigneeItron, Inc.
InventorNormand T. Lemay
Life of this patent
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Abstract
The oscillator of the present invention generally comprises a resonating device that is directly coupled to ground and a circuit portion. The circuit portion is operably coupled to the resonating device and includes a first transistor and a second transistor. The first transistor provides DC feedback to the second transistor and enables a temperature independent bias current through said second transistor.
Claims18
A temperature-compensated oscillator, comprising:
- a resonating device, wherein a resonator is directly coupled to a ground;
- a circuit portion operably coupled to said resonating device, wherein said circuit portion utilizes a first transistor and a second transistor, wherein said first transistor provides DC feedback to said second transistor, and wherein said DC feedback enables a temperature independent bias current through said second transistor, wherein said temperature independent bias current is achieved by utilizing substantially equivalent resistance on collector and emitter legs of the first transistor.
An oscillator, comprising:
- a resonating device;
- and
- a current biasing circuit that operates as a current source to said resonating device, wherein said current biasing circuit includes a biasing transistor and a direct current (DC) feedback transistor operably coupled to said biasing transistor, wherein a resistance on an emitter leg of said DC feedback transistor is substantially equivalent to a resistance on a collector leg of said DC feedback transistor.
A temperature compensated oscillator having an output voltage, comprising:
- resonating means for providing a resonating signal;
- temperature compensation means for substantially eliminating the effects of temperature on said resonating means so that said oscillator is provided with a substantially constant output voltage, wherein the effects of temperature are substantially eliminated by said temperature compensation means providing said resonating means with a substantially constant current source, wherein said substantially constant current source is achieved through via use of DC feedback and equivalent resistance.
Dependencies are inferred from the claim text.