Function generating circuit and temperature compensation type crystal oscillator

A technology of function generation and circuit, applied in the field of function generation circuit, can solve problems such as discreteness

Inactive Publication Date: 2004-08-25
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the reference frequency Fr also has discreteness
This variation and dispersion of oscillation frequency has become a major problem in high-precision electronic products

Method used

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  • Function generating circuit and temperature compensation type crystal oscillator
  • Function generating circuit and temperature compensation type crystal oscillator
  • Function generating circuit and temperature compensation type crystal oscillator

Examples

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Embodiment Construction

[0027] figure 1 A configuration example of a temperature compensation type crystal oscillator according to the present invention is shown. figure 1 The composition includes: controller 100, 1st order function generating circuit 200, 0th order function generating circuit 300, 3rd order function generating circuit 400, 5th order function generating circuit 500, 2 resistors 111, 112, variable capacitance diode 113, crystal oscillator circuit 600. Here, when the reference temperature is set as Tr, in order to keep the oscillation frequency of the crystal oscillation circuit 600 constant regardless of the ambient temperature Ta, the compensation voltage Vin that should be applied to the variable capacitance diode 113 can be obtained by the following formula:

[0028] Vin=-A(Ta-Tr) 5 -B(Ta-Tr) 3 +C(Ta-Tr)+D...(1)

[0029] In the formula: A, B, C, and D are all constants not equal to 0.

[0030] The controller 100 is a shift register composed of 27 flip-flops, which receives the...

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Abstract

With first, second and third current exchanger circuits cascaded, a current in proportion to a difference between an ambient temperature Ta and a reference temperature Tr is input to the first current exchanger circuit. The first current exchanger circuit supplies a current in proportion to the square of Ta-Tr to the second current exchanger circuit, the second current exchanger circuit supplies a current in proportion to the fourth power of Ta-Tr to the third current exchanger circuit, and the third current exchanger circuit outputs a current in proportion to the fifth power of Ta-Tr. Each of the first, second and third current exchanger circuits has a configuration which does not require a high supply voltage enough to drive a series circuit of three or more diodes.

Description

technical field [0001] The invention relates to a function generating circuit suitable for temperature compensation of crystal oscillation frequency and a temperature-compensated crystal oscillator using the function generating circuit. Background technique [0002] In recent years, while miniaturization and weight reduction of electronic products are required, it is also desired to further improve its precision and reliability. In this context, in many electronic products, crystal oscillators are widely used to generate clock pulse signals and the like. The oscillation frequency of a crystal oscillation circuit using a crystal oscillator requires that the oscillation frequency maintain a high degree of stability in response to changes in ambient temperature. Among such crystal resonators, thick-thin shear vibration is most used. [0003] It is well known that the oscillation frequency of a crystal oscillation circuit that uses thick-thin shear vibration will vary greatly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04G3/04G06G7/20H03B5/30H03L1/02
CPCH03L1/028H03L1/022
Inventor 新宫圭悟上西荣一竹内久人
Owner PANASONIC CORP
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