KR20020093415A - Automatic Frequency Control System - Google Patents

Automatic Frequency Control System Download PDF

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Publication number
KR20020093415A
KR20020093415A KR1020010032163A KR20010032163A KR20020093415A KR 20020093415 A KR20020093415 A KR 20020093415A KR 1020010032163 A KR1020010032163 A KR 1020010032163A KR 20010032163 A KR20010032163 A KR 20010032163A KR 20020093415 A KR20020093415 A KR 20020093415A
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KR
South Korea
Prior art keywords
frequency
output
target
target frequency
voltage
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KR1020010032163A
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Korean (ko)
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박병규
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박병규
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Priority to KR1020010032163A priority Critical patent/KR20020093415A/en
Publication of KR20020093415A publication Critical patent/KR20020093415A/en

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
    • H03L7/0991—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop the oscillator being a digital oscillator, e.g. composed of a fixed oscillator followed by a variable frequency divider
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L1/00—Stabilisation of generator output against variations of physical values, e.g. power supply

Abstract

PURPOSE: A method for automatically controlling a frequency is provided to secure a stability approximate to a target frequency by controlling changes of the frequency due to various causes without an additional compensation circuit by recognizing the difference between an output frequency and the target frequency. CONSTITUTION: A method for automatically controlling a frequency includes the steps of: measuring an output frequency of a voltage control oscillator(11) by a frequency measurement(12), calculating a difference between the result and a previously inputted target frequency at a micro processor(13) and outputting a direct voltage corresponding to the difference through a digital to analog convertor(14). The method directly compares the output frequency with the target frequency in such a way that the output frequency of the voltage control oscillator(11) approaches to the target frequency to thereby equal to each other.

Description

주파수 자동 제어 방법 { Automatic Frequency Control System }Automatic frequency control method {Automatic Frequency Control System}

본 발명은 발진기의 주파수 자동 제어에 관한 것으로, 발진기의 출력 주파수 변화를 감지하기 위해 출력 주파수를 직접 측정하고 목표주파수와의 차이를 보상함으로써 목표 주파수에 항시 근접하도록 자동 조정하여 주파수 안정도를 확보하는 방법에 관한 것이다.The present invention relates to the automatic control of the frequency of the oscillator, a method for ensuring frequency stability by automatically adjusting to always close to the target frequency by directly measuring the output frequency and compensating the difference with the target frequency in order to detect the change in the output frequency of the oscillator It is about.

현재 사용되고 있는 온도 보상형 수정 발진기는 수정진동자의 온도 변화 곡선을 미리 원하는 형태로 설정 제작하고 온도 센서를 이용 보상회로를 설계하여 조합하는 방식으로 설계의 난이도가 높고 수정진동자와 보상회로의 조합이 편차를 동반하므로 안정도를 임의로 목표 주파수에 근접 시키는 것이 어렵다.The temperature compensated crystal oscillator currently used is manufactured by setting the temperature change curve of the crystal oscillator in the desired shape and designing and combining the compensation circuit using the temperature sensor. The design difficulty is high and the combination of the crystal oscillator and the compensation circuit is different. It is difficult to bring stability to the target frequency arbitrarily.

또한, 온도 보상만이 가능하므로 전압 변동에 따른 주파수 변화, 경련 변화에 따른 주파수 변화 등은 보상할 수가 없다. 다음 논문에 온도 보상형 수정 발진기의 설계에 대해 상세히 다루고 있다.In addition, since only temperature compensation is possible, frequency changes due to voltage fluctuations and frequency changes due to cramp changes cannot be compensated. The following paper details the design of a temperature compensated crystal oscillator.

1980 IEEE INTERNATIONAL FREQUENCY CONTROL SYMPOSIUM1980 IEEE INTERNATIONAL FREQUENCY CONTROL SYMPOSIUM

Proc. 34th Ann. Freq. Control Symposium, USAERADCOM, Ft. Monmouth, NJ 07703, May 1980 ,pp 488-497Proc. 34th Ann. Freq. Control Symposium, USA ERADCOM, Ft. Monmouth, NJ 07703, May 1980, pp 488-497

S. Okano, T.Mitsuoka and T. Ohshima/Toyo Communication Equipment Co., Ltd.S. Okano, T.Mitsuoka and T. Ohshima / Toyo Communication Equipment Co., Ltd.

DIRECT-TEMPERATURE COMPENSATED CRYSTAL OSCILLATOR FOR ADVANCED VHF/UHF RADIO COMMUNICATION SYSTEMSDIRECT-TEMPERATURE COMPENSATED CRYSTAL OSCILLATOR FOR ADVANCED VHF / UHF RADIO COMMUNICATION SYSTEMS

본 발명은 발진기 출력 주파수 자체를 측정하여 목표 주파수와의 차이를 인지하여 보상하므로써, 많은 원인에 의한 주파수 변동을 특별한 보상 회로 고려 없이 제어할 수 있으므로 목표 주파수에 근접한 안정도를 확보할 수 있는 방법을 제시하는 것이다.The present invention measures the oscillator output frequency itself and recognizes and compensates for the difference from the target frequency, thereby providing a method of securing stability close to the target frequency because the frequency variation caused by many causes can be controlled without considering a special compensation circuit. It is.

도 1은 본 발명의 블록도1 is a block diagram of the present invention

도 2는 본 발명의 플로우차트2 is a flowchart of the present invention.

※ 도면의 주요 부분네 대한 부호의 설명※ Explanation of symbols about four main parts of drawing

11 :전압 제어 발진기 12 :주파수 측정기11: voltage controlled oscillator 12: frequency measuring instrument

13 :마이크로 프로세서 14 : 디지탈 아날로그 변환기13: Microprocessor 14: Digital Analog Converter

21 :목표 주파수 입력 22 :출력 주파수 측정21: Target frequency input 22: Output frequency measurement

23,24 :목표 주파수와 출력 주파수 비교23,24: Target frequency vs. output frequency

25 :출력 전압은 현재 전압 26 :출력 전압은 현재보다 한단계 낮게25: Output voltage is present voltage 26: Output voltage is one step lower than present

27 :출력 전압은 현재보다 한단계 높게27: The output voltage is one step higher than the present

주파수 변화를 직접 인지하기 위해서는 도 1과 같이 전압 제어 발진기(11)의 출력 주파수를 주파수 측정기(12)로 측정하고 그 결과를 마이크로 프로세스(13)에서 이미 입력된 목표 주파수와의 차를 계산하여 그 차분에 해당되는 직류전압을 디지탈 아날로그 변환기(14)를 통해 출력한다. 이 전압을 전압 제어 발진기의 제어 전압으로 입력 시키는 것이다. 전압 제어 발진기(11)의 주파수 제어는 발진기 내부 회로의 용량값 변화를 이용하므로, 바리켑다이오드를 채용하여 그 전압-용량값 변화 특성을 이용한다. 바리켑다이오드는 전압이 낮아지면 용량값이 증가하고 전압이 높아지면 용량값이 감소한다. 발진기 내부 회로의 용량값은 증가하면 주파수가 낮아지고 용량값이 감소하면 주파수가 높아진다. 따라서 발진기(11)의 출력 주파수가 목표 주파수 보다 높으면 회로의 용량값을 높혀서 출력 주파수를 나추어야 하므로, 직류 전압 변환기(14)의 전압을 현재보다 한 단계씩 낮추어 주면서(26) 목표 주파수에 근접시켜 가도록 프로그램 한다. 반대로 출력 주파수가 목표 주파수보다 낮으면 회로의 용량값을 낮추어 출력 주파수를 상승시켜야 하므로 직류 전압 변환기(14)의 전압을 현재보다 한 단계씩 높혀 주면서(27) 목표 주파수에 근접 시켜 가도록 프로그램 한다. 출력 주파수가 목표 주파수와 같으면 전압의 변동이 없도록 유지하도록 한다(25). 도 2는 항시 반복 되므로 자동으로 주파수를 직접 제어할 수 있다.In order to directly recognize the frequency change, the output frequency of the voltage controlled oscillator 11 is measured by the frequency measuring device 12 as shown in FIG. 1, and the result is calculated by calculating a difference between the target frequency already inputted by the microprocessor 13. The DC voltage corresponding to the difference is output through the digital analog converter 14. This voltage is input to the control voltage of the voltage controlled oscillator. Since the frequency control of the voltage controlled oscillator 11 uses the capacitance value change of the internal circuit of the oscillator, a variation diode is employed to utilize the voltage-capacitance value change characteristic. Barrier diodes have increased capacitance when the voltage is lowered and decrease capacitance when the voltage is higher. When the capacitance value of the oscillator internal circuit increases, the frequency decreases, and when the capacitance value decreases, the frequency increases. Therefore, if the output frequency of the oscillator 11 is higher than the target frequency, the output frequency should be increased by dividing the output frequency by increasing the capacitance value of the circuit, thereby lowering the voltage of the DC voltage converter 14 by one step than the present (26) to approach the target frequency. Program it to go. On the contrary, if the output frequency is lower than the target frequency, the output frequency must be increased by lowering the capacitance value of the circuit, so that the voltage of the DC voltage converter 14 is increased by one step than the present time (27), and the program is made to approach the target frequency. If the output frequency is the same as the target frequency, it is maintained to have no change in voltage (25). 2 is always repeated, so the frequency can be controlled directly and automatically.

본 발명은 출력 주파수를 주파수 측정기로 직접 측정하여 목표 주파수와의차이를 보상함으로써 각종 원인에 의한 주파수 변동을 보상하기 위해 개별 원인들을 고려함이 없이 목표 주파수에 근접 시킬 수 있다. 따라서 복잡한 보상 회로를 설계할 필요가 없으므로 단순한 전압 제어 발진기로도 목표 주파수에 항시 근접하는 안정된 주파수 특성을 얻을 수 있다.The present invention can directly approach the target frequency without considering individual causes to compensate for the frequency variation caused by various causes by measuring the output frequency directly with a frequency meter to compensate for the difference with the target frequency. This eliminates the need for designing complex compensation circuitry, resulting in stable frequency characteristics that are always close to the target frequency, even with a simple voltage-controlled oscillator.

Claims (2)

발진기 주파수 자동 제어 방법에 있어서,In the oscillator frequency automatic control method, 발진기의 출력 주파수(22)가 목표 주파수(21)와 같아지도록 근접시키기 위해 출력 주파수와 목표 주파수를 직접 비교하는(23,24) 제어 방법.A control method for directly comparing (23,24) the output frequency with the target frequency in order to approximate the output frequency (22) of the oscillator to be equal to the target frequency (21). 제 1 항에 있어서, 발진기의 출력 주파수를 측정하기(22) 위해 주파수를 직접 측정하는 주파수 측정기(12)를 사용하여 구성하는 주파수 제어 방법.2. The method of claim 1, configured using a frequency meter (12) that directly measures the frequency to measure (22) the output frequency of the oscillator.
KR1020010032163A 2001-06-08 2001-06-08 Automatic Frequency Control System KR20020093415A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR920001857A (en) * 1990-06-22 1992-01-30 이헌조 Frequency automatic regulation control system
KR930018859A (en) * 1992-02-15 1993-09-22 정용문 Frequency synthesizer
KR950010330A (en) * 1993-09-28 1995-04-28 김광호 Method and device for automatic adjustment of autonomous oscillation frequency of voltage controlled oscillator
KR19990006583A (en) * 1997-06-03 1999-01-25 다니엘 케이. 니콜스 Apparatus and tuning method for voltage controlled oscillators
JPH1174788A (en) * 1997-08-28 1999-03-16 Sanyo Electric Co Ltd Pll circuit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR920001857A (en) * 1990-06-22 1992-01-30 이헌조 Frequency automatic regulation control system
KR930018859A (en) * 1992-02-15 1993-09-22 정용문 Frequency synthesizer
KR950010330A (en) * 1993-09-28 1995-04-28 김광호 Method and device for automatic adjustment of autonomous oscillation frequency of voltage controlled oscillator
KR19990006583A (en) * 1997-06-03 1999-01-25 다니엘 케이. 니콜스 Apparatus and tuning method for voltage controlled oscillators
JPH1174788A (en) * 1997-08-28 1999-03-16 Sanyo Electric Co Ltd Pll circuit

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