Temperature-compensated crystal oscillator

Abstract

There is provided a temperature-compensated crystal oscillator for reducing a voltage noise of a cubic function control voltage controlling an output frequency of an oscillation circuit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating a linear function generating circuit constituting a temperature compensation circuit in a temperature-compensated crystal oscillator according to the invention.

FIG. 2 is a diagram illustrating a configuration of the linear function generating circuit in the temperature-compensated crystal oscillator according to the invention.

FIG. 3 is a diagram illustrating a configuration of another linear function generating circuit in the temperature-compensated crystal oscillator according to the invention.

FIG. 4 is a diagram illustrating a configuration of a control voltage generating circuit in a temperature-compensated crystal oscillator according to a first embodiment of the invention.

FIG. 5 is a diagram illustrating a configuration of another control voltage generating circuit in the temperature-compensated crystal oscillator according to the first embodiment of the invention.

FIG. 6 is a diagram illustrating a configuration of a voltage controlled oscillator in a temperature-compensated crystal oscillator according to a second embodiment of the invention.

FIG. 7 is a diagram illustrating an f-V characteristic of the voltage controlled oscillator in the temperature-compensated crystal oscillator according to the second embodiment of the invention.

FIG. 8 is a diagram illustrating a characteristic of a linear function control voltage in the temperature-compensated crystal oscillator according to the second embodiment of the invention.

FIG. 9 is a diagram illustrating a characteristic of a cubic function control voltage in the temperature-compensated crystal oscillator according to the second embodiment of the invention.

FIG. 10 is a diagram illustrating a configuration of a control voltage generating circuit in a temperature-compensated crystal oscillator according to a third embodiment of the invention.

FIG. 11 is a diagram illustrating a configuration of a control voltage generating circuit in a temperature-compensated crystal oscillator according to a fourth embodiment of the invention

FIG. 12 is a diagram illustrating a configuration of a control voltage generating circuit in a temperature-compensated crystal oscillator according to a fifth embodiment of the invention.

FIG. 13 is a diagram illustrating the configuration of the control voltage generating circuit in the temperature-compensated crystal oscillator according to the fifth embodiment of the invention.

FIG. 14 is a diagram illustrating an example of a known TCXO.

FIG. 15 is a diagram illustrating another example of the known TCXO.

FIG. 16 is a diagram illustrating a characteristic of a known cubic function generating circuit.

Claims

1. A temperature-compensated crystal oscillator, comprising: a quartz vibrator;an amplifier having an oscillation frequency controller; anda temperature compensation circuit of an oscillation frequency of the quartz vibrator,wherein a reference voltage for a compensation voltage of the temperature compensation circuit is generated using a forward voltage of a diode.

2. A temperature-compensated crystal oscillator, comprising: a quartz vibrator;an amplifier having an oscillation frequency controller; anda temperature compensation circuit of an oscillation frequency of the quartz vibrator,wherein a compensation voltage of the temperature compensation circuit is divided into a linear-function component and a cubic-function component and is applied to the oscillation frequency controller.

3. A temperature-compensated crystal oscillator, comprising: a quartz vibrator;an amplifier having an oscillation frequency controller; anda temperature compensation circuit of an oscillation frequency of the quartz vibrator,wherein a reference voltage for a compensation voltage of a linear-function component is generated using a forward voltage of a diode when the temperature compensation circuit is constituted by a linear-function component circuit portion and a cubic-function component circuit portion.

4. A temperature-compensated crystal oscillator, comprising: a quartz vibrator;an amplifier having an oscillation frequency controller; anda temperature compensation circuit of an oscillation frequency of the quartz vibrator,wherein a reference voltage for a compensation voltage of a cubic-function component is generated using a forward voltage of a diode when the temperature compensation circuit is constituted by a linear-function component circuit portion and a cubic-function component circuit portion.

5. A temperature-compensated crystal oscillator, comprising: a quartz vibrator;an amplifier having an oscillation frequency controller; anda temperature compensation circuit of an oscillation frequency of the quartz vibrator,wherein a linear-function component and a cubic-function component are generated using a forward voltage of a diode as a reference voltage when a compensation voltage of the temperature compensation circuit is divided into the linear-function component and the cubic-function component and is applied to the oscillation frequency controller.