OSCILLATION CIRCUIT HAVING NEGATIVE RESISTANCE ELEMENT AND OSCILLATOR USING THE OSCILLATION CIRCUIT

• US 20120119838A1
• Filed: 08/13/2010
• Published: 05/17/2012
• Est. Priority Date: 09/07/2009
• Status: Active Grant

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Koyama, Yasushi, Sekiguchi, Ryota
• Granted Patent: US 8,896,389 B2
• Time in Patent Office: Days
• US Class Current: 331/115
• CPC Class Codes: H03B 7/08 being a tunnel diode

Abstract

An oscillation circuit including: a negative resistance element; a resonance circuit connected to the negative resistance element; and a stabilization circuit connected in parallel with the negative resistance element to suppress parasitic oscillation, wherein the stabilization circuit includes a variable shunt resistor and a adjusting device for adjusting the shunt resistor.

Claims

1. An oscillation circuit comprising:

a negative resistance element;

a resonance circuit connected to the negative resistance element; and

a stabilization circuit connected in parallel with the negative resistance element to suppress parasitic oscillation,

wherein the stabilization circuit includes a variable shunt resistor and a 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 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 negative resistance element, the method comprising:

varying the shunt resistance of a stabilization circuit for suppressing parasitic oscillation;

adjusting the impedance of the oscillation circuit in a low-frequency band; and

performing one of adjustment and switching on the oscillation output of the oscillation circuit in a frequency band higher than the low-frequency band.