Oscillation circuit having negative resistance element and oscillator using the oscillation circuit

1. 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.

2. The oscillation circuit according to claim 1 , wherein one of adjustment and switching is performed on oscillation output by adjusting the shunt resistor through the use of the adjusting device.

3. The oscillation circuit according to claim 1 , wherein the shunt resistor includes a transistor.

4. The oscillation circuit according to claim 1 , wherein the stabilization circuit is connected to a position where a resonant standing wave of the resonance circuit has a node.

5. The oscillation circuit according to claim 1 , wherein the differential negative resistance element is a resonant tunneling diode.

6. The oscillation circuit according to claim 1 , wherein the variable shunt resistor includes a plurality of shunt resistors, and wherein the adjusting device adjusts variable shunt resistor by switching the plurality of shunt resistors.

7. An oscillator comprising:

a substrate; and

an oscillation circuit according to claim 1 integrated on the substrate.

8. 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.

9. The oscillation circuit according to claim 1 , further comprising a bias device for applying a bias to the differential negative resistance element,

wherein the adjusting device for adjusting the shunt resistor is different from the bias device.

10. A method for adjusting an oscillation circuit according to claim 8 , wherein oscillation output adjustment or oscillation switching is carried out while applying a bias to the differential negative resistance element.

11. 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.

12. An oscillator comprising:

a substrate; and

an oscillation circuit according to claim 11 integrated on the substrate.

13. 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.

14. An oscillation circuit according to claim 1 , wherein the stabilization circuit is disposed between the differential negative resistance element and the bias power supply.