Light-controlled oscillator
AssigneeDenso Corporation
InventorYasuyuki Miyake
Life of this patent
Estimating the term…
Abstract
A light-controlled oscillator includes a circuit device, a detection circuit and a control circuit. The circuit device changes its characteristics when light is applied, so that a frequency of the oscillation shifts. The detection circuit detects a change of the characteristics caused according to the applied light. The control circuit controls an operation of the oscillator to increase a shift of the frequency of the oscillation according to the change of the characteristics. The oscillation frequency can be shifted by a desired amount only by detecting a change of characteristics based on a condition of the light, even when the intensity of the light is small.
Claims17
A light-controlled oscillator, comprising:
- a circuit device for generating oscillation, the circuit device changing in characteristics when light is applied so that a frequency of the oscillation shifts;
- an optical attenuating means for attenuating the light applied to the circuit device;
- a detection means for detecting a change of the characteristics of the circuit device according to the applied light;
- and
- a control means for controlling an operation of the circuit device to increase a shift of the frequency of the oscillation according to the change of the characteristics of the circuit device, which is detected by the detection means.
A light-controlled oscillator, comprising:
- a circuit device including a field-effect transistor for generating oscillation, the circuit device changing in characteristics when light is applied so that a frequency of the oscillation shifts;
- a detection means for detecting a change of drain current of the field-effect transistor according to the applied light;
- and
- a control means for controlling an operation of the circuit device to increase a shift of the frequency of the oscillation according to the change of the characteristics of the circuit device, which is detected by the detection means.
A light-controlled oscillator, comprising:
- a circuit device including a transistor for generating oscillation, the transistor including a light-absorbing layer of In0.53Ga0.47As and the channel layer of In0.80Ga0.20As on an InP substrate, and the circuit device changing in characteristics when light is applied so that a frequency of the oscillation shifts;
- a detection means for detecting a change of the characteristics of the circuit device according to the applied light;
- and
- a control means for controlling an operation of the circuit device to increase a shift of the frequency of the oscillation according to the change of the characteristics of the circuit device, which is detected by the detection means.
A light-controlled oscillator, comprising:
- a circuit device including a transistor for generating oscillation, the transistor being a high electron mobility transistor of InAlAs/InGaAs where the InGaAs contains In in an amount of at least one of 0.53 and a 0.80, and the circuit device changing in characteristics when light is applied so that a frequency of the oscillation shifts;
- a detection means for detecting a change of the characteristics of the circuit device according to the applied light;
- and
- a control means for controlling an operation of the circuit device to increase a shift of the frequency of the oscillation according to the change of the characteristics of the circuit device, which is detected by the detection means.
Dependencies are inferred from the claim text.