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US 8,896,389 B2Granted
Oscillation circuit having negative resistance element and oscillator using the oscillation circuit
AssigneeCanon Kabushiki Kaisha
InventorsYasushi Koyama, Ryota Sekiguchi
Life of this patent
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Abstract
The present disclosure relates to an oscillation circuit including a differential negative resistance element, a resonance circuit connected to the differential negative resistance element, and a stabilization circuit connected in parallel with the negative resistance element to suppress parasitic oscillation. The stabilization circuit includes a variable shunt resistor and an adjusting device for adjusting the shunt resistor.
Claims14
An oscillation circuit comprising;
- a differential negative resistance element;
- a resonance circuit connected in parallel with the differential negative resistance element in a place between a terminal a and a terminal a′;
- a bias power supply connected in parallel with the differential negative resistance element in a place between the terminal a and the terminal a′ in order to apply a bias to the differential negative resistance element;
- and
- a stabilization circuit connected in parallel with the differential negative resistance element in a place between the terminal a and the terminal a′ to suppress parasitic oscillation,
- wherein the stabilization circuit includes a variable shunt resistor connected in parallel with the differential negative resistance element in a place between the terminal a and the terminal a′ and an adjusting device for adjusting the shunt resistor.
3 more elements
A method for adjusting an oscillation circuit including a differential negative resistance element, the method comprising:
- performing one of adjustment and switching on the oscillation output of the oscillation circuit in a frequency band higher than the low-frequency band on the oscillation circuit by adjusting the impedance of the oscillation circuit in a low-frequency band by varying the shunt resistance of a stabilization circuit for suppressing parasitic oscillation;
- wherein a resonance circuit is connected in parallel with the differential negative resistance element in a place between a terminal a and a terminal a′;
- wherein a bias power supply is connected in parallel with the differential negative resistance element in a place between the terminal a and the terminal a′ in order to apply a bias to the differential negative resistance element;
- wherein the stabilization circuit is connected in parallel with the differential negative resistance element in a place between the terminal a and the terminal a′ to suppress parasitic oscillation, and
- wherein the stabilization circuit includes a variable shunt resistor connected in parallel with the differential negative resistance element in a place between the terminal a and the terminal a′ and an adjusting device for adjusting the shunt resistor,
- the method further comprising:
- performing one of adjustment and switching on the oscillation output of the oscillation circuit in a frequency band higher than the low-frequency band on the oscillation circuit by adjusting the impedance of the oscillation circuit in a low-frequency band by varying the shunt resistance by means of the adjusting device.
4 more elements
An oscillation circuit comprising;
- a resonant tunneling diode;
- a resonance circuit connected in parallel with the resonant tunneling diode to suppress parasitic oscillation,
- a stabilization circuit connected in parallel with the resonant tunneling diode to suppress parasitic oscillation, and
- a bias power supply connected in parallel with the resonant tunneling diode in order to apply a bias to the resonant tunneling diode,
- wherein the stabilization circuit includes a variable shunt resistor and an adjusting device for adjusting the shunt resistor.
2 more elements
A method for adjusting an oscillation circuit including a differential negative resistance element,
- the method comprising performing one of adjustment and switching on the oscillation output of the oscillation circuit in a frequency band higher than the low-frequency band on the oscillation circuit by adjusting the impedance of the oscillation circuit in a low-frequency band by varying the shunt resistance of a stabilization circuit for suppressing parasitic oscillation,
- wherein the differential negative resistance element is a resonant tunneling diode, and
- wherein the oscillation circuit further comprises a bias power supply connected in parallel with the resonant tunneling diode in order to apply a bias to the resonant tunneling diode.
Dependencies are inferred from the claim text.