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Temperature-compensated crystal oscillator and method of temperature compensation

A technology of crystal oscillator and temperature compensation, applied in power oscillators, electrical components, etc., can solve problems such as high cost and small thermostat, and achieve the effect of reducing manufacturing cost, realizing temperature compensation, and high-precision temperature compensation

Inactive Publication Date: 2005-09-21
ASAHI KASEI ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0016] Furthermore, the method of (4) requires a small thermostat and thus has a rather high cost

Method used

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  • Temperature-compensated crystal oscillator and method of temperature compensation
  • Temperature-compensated crystal oscillator and method of temperature compensation
  • Temperature-compensated crystal oscillator and method of temperature compensation

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Embodiment Construction

[0050] Embodiments of the present invention will be described below with reference to the drawings.

[0051] Fig. 1 is a block diagram showing an example of the configuration of an embodiment of the present invention.

[0052] As shown in FIG. 1 , the temperature compensated crystal oscillator according to this embodiment at least includes a temperature detector 11 , an analog type temperature compensation part 12 , a digital type temperature compensation part 13 , an adding circuit 14 , and a voltage controlled crystal oscillator circuit 3 .

[0053] In this temperature compensated crystal oscillator, based on the input voltage corresponding to the temperature detected by the temperature sensor 11, the analog type temperature compensating section 12 generates the temperature compensating voltage V1 corresponding to the detected temperature using an analog technique. On the other hand, The digital type temperature compensating part 13 generates a predetermined temperature comp...

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Abstract

A temperature-compensated crystal oscillator comprises a temperature sensor (11), an analog temperature compensator (12), a digital temperature compensator (13), an adder circuit (14), and a voltage-controlled crystal oscillator circuit (3). The analog temperature compensator (12) and the digital temperature compensator (13) generate temperature compensation voltages in response to their respective input voltages corresponding to the temperature detected by the temperature sensor (11). The temperature compensation voltages are combined by the adder circuit (14). The combined voltage is applied to the voltage control terminal of the voltage-control crystal oscillation circuit (3) to stabilize the oscillating frequency of the voltage control-crystal oscillator circuit (3) with a crystal oscillator (4) temperature-compensated.

Description

technical field [0001] The invention relates to a temperature-compensated crystal oscillator capable of temperature compensation and generating an oscillating signal of a predetermined frequency, and also relates to a method for temperature compensation of the crystal oscillator. Background technique [0002] In general, there are the following four methods for performing temperature compensation of a crystal oscillator. [0003] (1) Direct compensation type [0004] In this type, the oscillation ring of the crystal oscillator has a temperature compensation circuit including capacitance and resistance. During oscillation, the values ​​of capacitance and resistance are changed according to temperature, thereby stabilizing the oscillation frequency. [0005] (2) Indirect analog compensation system [0006] In this system, the crystal oscillator to be temperature compensated is a voltage-controlled crystal oscillator circuit (VCXO) 3, as shown in Figure 7. For temperature c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03B5/04H03B5/32
CPCH03B5/32H03B5/04H03B5/323
Inventor 根本谦治
Owner ASAHI KASEI ELECTRONICS CO LTD
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