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Oscillator and communication apparatus

A technology of oscillators and voltage-controlled oscillations, applied in power oscillators, electrical components, output stabilization, etc., can solve problems such as low development efficiency

Inactive Publication Date: 2004-11-03
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the past, TCXO and VCXO were generally independently developed, and even common parts were developed separately, resulting in low development efficiency.
In addition, due to separate development, although there are many common parts, it is still necessary to set up manufacturing lines separately, and it is necessary to store parts separately

Method used

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  • Oscillator and communication apparatus
  • Oscillator and communication apparatus
  • Oscillator and communication apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0053] [1-1] Overall configuration of Embodiment 1

[0054] FIG. 1 is a schematic configuration diagram of an oscillator according to Embodiment 1 of the present invention.

[0055] The oscillator 10 is composed of a voltage control oscillation circuit 20, temperature compensation circuits 30 and 40, a frequency adjustment circuit 50, an initial deviation correction circuit 60, an addition circuit 70, a control circuit 80, a memory 90, switches SW1, SW2, SW3, and SW4.

[0056] The voltage-controlled oscillation circuit 20 includes an oscillation circuit 22 for oscillating a piezoelectric oscillator 21 such as a crystal oscillator or a ceramic oscillator, and a variable capacitance diode (hereinafter referred to as a variable capacitance diode) connected to an intermediate point between an input resistor 23 and the piezoelectric oscillator 21 . 24. The buffer circuit 25 is formed. In this way, the frequency of the oscillation signal Sout output from the output terminal OUT cha...

Embodiment approach 2

[0101] The difference between the oscillator 10 according to the second embodiment and the oscillator 10 according to the first embodiment is that the temperature compensation circuit 30 is only when the temperature compensation voltage V2 of the temperature compensation circuit 40 is not within the predetermined frequency deviation. Output temperature compensation voltage V1 within the temperature range. Specifically, as shown in FIG. 13 , only in the range of temperatures Ta to Tb and the range of temperatures Tc to Td in which the frequency temperature characteristic fc of the oscillation signal Sout after temperature compensation by the temperature compensation circuit 40 is not within the target frequency deviation Inside, the temperature compensation voltage V1 of the temperature compensation circuit 30 is supplied to the voltage control oscillation circuit 20 through the addition circuit 70 . As a result, it is also possible to obtain the frequency temperature character...

Embodiment approach 3

[0103] FIG. 14 is a schematic configuration diagram of an oscillator according to Embodiment 3. FIG.

[0104] The main difference between the oscillator 10 according to the third embodiment and the oscillators 10 according to the above-mentioned embodiments is that the initial offset correction circuit 60A is connected to the anode terminal of the varactor diode 24 of the voltage control oscillation circuit 20 through the switch SW4. In this way, the intermediate connection point between the anode terminal of the varactor diode 24 and the switch SW4 is grounded through the bias resistor Rx.

[0105] FIG. 15 is a circuit diagram showing the initial offset correction circuit 60A together with peripheral configurations.

[0106] One end of the initial offset correction circuit 60A is connected to the switch SW4, and the other end is grounded, and the basic capacitor C0 functioning as a fixedly connected capacitive element functions as a selected capacitive element in order to mak...

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Abstract

An oscillator 10 includes temperature compensation circuits 30 and 40, a frequency adjusting circuit 50, and an initial deviation correcting circuit 60. Switches SW 1 to 4 are controlled based on control data DC stored in a memory 90 so that a temperature compensation voltage V1, a temperature compensation voltage V2, a frequency adjusting voltage V3, and an initial deviation correcting voltage V4, output from the above circuits, are selectively added, supplying a sum to a voltage-controlled oscillation circuit 20 as a control voltage VA.

Description

technical field [0001] The present invention relates to an oscillator used in a communication device such as a mobile phone and a communication device using the oscillator, and more particularly to a function-changeable oscillator and a communication device including the oscillator. technical background [0002] Crystal oscillators are generally classified according to functions such as SPXO (Simple Packaged Crystal Oscillator), VCXO (yoltage Controlled Crystal Oscillator), and TCXO (Temperature Compensated Crystal Oscillator). Here, SPXO is a crystal oscillator that does not perform temperature compensation, TCXO (temperature compensated oscillator) is a crystal oscillator that performs temperature compensation based on the principle that the output frequency does not change even if the ambient temperature changes, and VCXO (voltage controlled oscillator) is A crystal oscillator whose output frequency is variable according to an external control voltage. In addition, a cry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B1/00H03B5/32H03L1/02
CPCH03B5/32H03B2201/0208H03L1/025
Inventor 冈学市濑和成
Owner SEIKO EPSON CORP