Oscillation circuit and oscillation method
AssigneeSony Corporation
InventorsTadashi Imai, Kozo Kobayashi
Life of this patent
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Abstract
An oscillation circuit and an oscillation method for generating a high-frequency signal in which NPN transistors are differentially connected to each other. The signal output from the collector of a first NPN transistor is positively fed back to the base of a second NPN transistor via a first capacitor, and the signal output from the collector of the second NPN transistor is positively fed back to the base of the first NPN transistor via a second capacitor. A one-port-type SAW resonator is connected to the collectors of the NPN transistors via the capacitors for blocking the flow of direct current. Thus, it becomes possible to generate a high-frequency signal with a high degree of accuracy.
Claims16
An oscillation circuit for generating a high-frequency signal, said oscillation circuit comprising:
- a differential amplifier having at least a pair of active elements which are differentially connected;
- a positive feedback circuit for positively feeding back an output of said said differential amplifier to an input of said differential amplifier;
- and
- a one-port-type SAW resonator connected between said pair of active elements of said differential amplifier.
An oscillation method for generating a high-frequency signal, said method comprising the steps of:
- positively feeding back an output of a differential amplifier having at least a pair of differentially connected active elements to an input of said differential amplifier;
- and
- causing a one-port-type SAW resonator connected between said pair of active elements of said differential amplifier to perform an oscillation operation.
Dependencies are inferred from the claim text.