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KR100258996B1 - Device for testing characteristic of amd saw filter - Google Patents

Device for testing characteristic of amd saw filter Download PDF

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Publication number
KR100258996B1
KR100258996B1 KR1019970072405A KR19970072405A KR100258996B1 KR 100258996 B1 KR100258996 B1 KR 100258996B1 KR 1019970072405 A KR1019970072405 A KR 1019970072405A KR 19970072405 A KR19970072405 A KR 19970072405A KR 100258996 B1 KR100258996 B1 KR 100258996B1
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saw filter
time constant
signal
smd
smd saw
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KR19990052874A (en
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박병훈
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권호택
대우전자부품주식회사
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
    • G01R31/2806—Apparatus therefor, e.g. test stations, drivers, analysers, conveyors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00—Arrangements for displaying electric variables or waveforms
    • G01R13/02—Arrangements for displaying electric variables or waveforms for displaying measured electric variables in digital form
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/64—Filters using surface acoustic waves

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Engineering & Computer Science (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

PURPOSE: An apparatus for testing characteristic of an SMD saw filter is provided which additionally includes a characteristic tester satisfying the circuit condition of an appliance employing the SMD saw filter to smoothly measure the characteristic of the SMD saw filter. CONSTITUTION: An apparatus for testing characteristic of an SMD saw filter(70) includes a measuring instrument(10) for inputting/outputting a signal for measuring the characteristic of the SMD saw filter, the first transformer(20) for transforming the signal applied from the measuring instrument to be suitable to the voltage signal of an appliance employing the SAM saw filter, and the first time constant controller(30) connected to the first transformer to control the time constant of the signal applied from the first transformer. The apparatus further has an SMD saw filter mount(40) on which the saw filter is mounted, the second time constant controller(50) connected to the SMD saw filter mount to control the time constant of the signal output through the SMD saw filter, and the second transformer(60) connected to the second time constant controller to transform the signal applied from the second time constant controller to be suitable for the measuring instrument to apply the transformed signal to the measuring instrument.

Description

ＳＭＤ 쏘필터의 특성검사장치Characteristic inspection device of SMD saw filter

본 발명은 쏘필터의 특성검사장치에 관한 것으로, 보다 상세하게는 SMD 쏘필터가 채용되는 기기의 회로조건을 만족하는 특성검사장치를 별도로 구비하여 SMD 쏘필터의 특성을 원활하게 측정할 수 있는 SMD 쏘필터의 특성검사장치에 관한 것이다.The present invention relates to a characteristic inspection apparatus for a saw filter, and more particularly, SMD having a characteristic inspection apparatus that satisfies the circuit conditions of the device in which the SMD saw filter is employed to smoothly measure the characteristics of the SMD saw filter. The present invention relates to an apparatus for inspecting properties of a saw filter.

일반적으로 쏘필터는 텔레비전 또는 이동통신의 단말기등에 사용되며, 텔레비전의 튜너에서 선택된 채널주파수를 중간주파수로 변환추출하는 과정에서 시스템에 요구되는 색, 영상 및 음성등의 중간주파수 신호레벨을 자체 필터특성에서 결정하여 최적의 신호크기로 배출시키는 여파기능을 수행하는 특성을 갖는다. 상기와 같은 기능을 갖는 SMD 쏘필터의 특성을 검사하기 위해서는 SMD 쏘필터가 채용되는 기기의 환경에 맞도록 측정장치를 설치하여야 한다.In general, the saw filter is used for a terminal of a television or a mobile communication device. The filter filters the intermediate frequency signal level such as color, video and audio required by the system in the process of converting and extracting the channel frequency selected from the tuner of the television to an intermediate frequency. It has the characteristic of performing the filter function which decides at and discharges to the optimum signal size. In order to inspect the characteristics of the SMD saw filter having the above function, it is necessary to install a measuring device suitable for the environment of the device in which the SMD saw filter is adopted.

본 발명의 목적은 SMD 쏘필터가 채용되는 기기의 회로조건을 만족하는 특성검사장치를 별도로 구비하여 SMD 쏘필터의 특성을 원활하게 측정할 수 있는 SMD 쏘필터의 특성검사장치를 제공하는데 있다.SUMMARY OF THE INVENTION An object of the present invention is to provide a characteristic inspection apparatus for an SMD saw filter, which is capable of smoothly measuring the characteristics of the SMD saw filter by separately providing a characteristic inspection apparatus that satisfies the circuit conditions of a device employing the SMD saw filter.

도 1은 본 발명에 따른 SMD 쏘필터의 특성검사장치를 개략적으로 나타낸 회로도이다.1 is a circuit diagram schematically showing an apparatus for inspecting properties of an SMD saw filter according to the present invention.

〈도면의 주요부분에 대한 부호의 설명〉<Explanation of symbols for main parts of drawing>

10 : 계측기 20 : 제1 트랜스포머10: measuring instrument 20: first transformer

30 : 제1 시정수조절부 40 : SMD 쏘필터장착부30: first time constant adjustment unit 40: SMD saw filter mounting portion

50 : 제2 시정수조절부 60 : 제2 트랜스포머50: second time constant adjusting unit 60: second transformer

70 : SMD 쏘필터70: SMD Saw Filter

상기 목적을 달성하기 위하여 본 발명은 SMD 쏘필터의 특성을 측정하는 신호를 입/출력하는 측정용 계측기; 상기 계측기로부터 인가되는 신호를 SMD 쏘필터가 채택되는 기기의 전압신호에 맞도록 변환시켜주는 제1 트랜스포머; 상기 제1 트랜스포머에 접속되며, 저항(R), 인덕턴스(L), 캐패시턴스(C)등으로 이루어져 제1 트랜스포머로부터 인가되는 신호의 시정수를 조절하는 제1 시정수조절부; 상기 제1 시정수조절부에 접속되며, SMD 쏘필터가 장착되는 SMD 쏘필터장착부; 상기 SMD 쏘필터장착부에 접속되며, SMD 쏘필터를 통해 출력되는 신호의 시정수를 조절하는 제2 시정수조절부; 그리고 상기 제2 시정수조절부에 접속되며, 제2 시정수조절부로부터 인가되는 신호를 계측기에 맞도록 변환시켜 계측기에 인가하는 제2 트랜스포머로 이루어지는 SMD 쏘필터의 특성검사장치를 제공한다.In order to achieve the above object, the present invention is a measuring instrument for inputting / outputting a signal for measuring the characteristics of the SMD saw filter; A first transformer for converting a signal applied from the meter to match a voltage signal of a device adopting an SMD saw filter; A first time constant adjusting unit connected to the first transformer and configured to include a resistor (R), an inductance (L), a capacitance (C), and the like, to adjust a time constant of a signal applied from the first transformer; An SMD saw filter mounting unit connected to the first time constant adjusting unit and mounted with a SMD saw filter; A second time constant adjusting unit connected to the SMD saw filter mounting unit and adjusting a time constant of a signal output through the SMD saw filter; And it is connected to the second time constant adjustment unit, and provides a characteristic inspection apparatus for the SMD saw filter comprising a second transformer for converting the signal applied from the second time constant adjustment unit to match the measuring instrument and applied to the measuring instrument.

본 발명에 의하면, SMD 쏘필터의 특성을 측정하는 측정용 계측기에 제1 및 제2 트랜스포머, 제1 및 제2 시정수조절부 그리고 SMD 쏘필터장착부로 이루어지는 특성검사장치를 연결한 후 특성검사장치의 SMD 쏘필터장착부에 시험용 SMD 쏘필터를 착설시킨다. 상기 SMD 쏘필터장착부에 SMD 쏘필터를 착설시킨 후 계측기를 이용하여 특성검사장치에 테스트용 신호를 인가하면 제1 트랜스포머 및 제1 시정수조절부를 통해 시험용 SMD 쏘필터에 신호가 인가된다. 상기 시험용 SMD 쏘필터를 통과한 신호는 제2 시정수조절부 및 제2 트랜스포머를 통해 신호가 변환되어 계측기에 인가되면 계측기는 특성검사장치로부터 인가되는 신호를 표시부에 디스플레이시키게 된다.According to the present invention, after the characteristic measuring device consisting of the first and second transformer, the first and second time constant control unit and the SMD saw filter mounting unit to the measuring instrument for measuring the characteristics of the SMD saw filter, The SMD saw filter for test is installed in the SMD saw filter mounting part. When the SMD saw filter is installed in the SMD saw filter mounting unit and the test signal is applied to the characteristic inspection apparatus using a measuring instrument, the signal is applied to the test SMD saw filter through the first transformer and the first time constant adjusting unit. When the signal passing through the test SMD saw filter is converted into a signal through the second time constant adjusting unit and the second transformer and applied to the measuring instrument, the measuring instrument displays a signal applied from the characteristic inspection apparatus on the display unit.

이하, 첨부된 도면을 참조하여 본 발명을 설명하면 다음과 같다.Hereinafter, the present invention will be described with reference to the accompanying drawings.

도 1은 본 발명에 따른 SMD 쏘필터의 특성검사장치를 개략적으로 나타낸 회로도이다.1 is a circuit diagram schematically showing an apparatus for inspecting properties of an SMD saw filter according to the present invention.

도 1을 참조하여 SMD 쏘필터의 특성검사장치를 설명하면, 먼저, SMD 쏘필터(70)의 특성을 측정하는 측정용 계측기(10)는 시험할 SMD 쏘필터(70)에 인가할 신호를 출력시키거나 또는 SMD 쏘필터(70)로부터 출력되는 신호를 받아 비교분석하여 표시부(도시 안됨)에 디스플레이시키게 된다. 상기 계측기(10)에는 제1 트랜스포머(20)가 접속되며, 상기 제1 트랜스포머(20)는 계측기(10)로부터 인가되는 신호를 SMD 쏘필터가 채택되는 기기의 전압신호에 맞도록 신호를 변환시켜주게 된다. 즉, 계측기(10)로부터 출력되는 테스트용 신호는 SMD 쏘필터(70)가 설치되는 기기에서 사용되는 신호의 크기와 다르므로 제1 트랜스포머(20)는 계측기(10)로부터 인가되는 신호를 기기에서 사용되는 신호의 크기로 변환시켜주게 된다.Referring to FIG. 1, a characteristic inspection apparatus for an SMD saw filter will be described. First, the measuring instrument 10 measuring the characteristics of the SMD saw filter 70 outputs a signal to be applied to the SMD saw filter 70 to be tested. Alternatively, the signal output from the SMD saw filter 70 may be received and compared and displayed on a display unit (not shown). A first transformer 20 is connected to the meter 10, and the first transformer 20 converts a signal applied from the meter 10 so as to match a voltage signal of a device adopting an SMD saw filter. Given. That is, since the test signal output from the measuring instrument 10 is different from the signal used in the apparatus in which the SMD saw filter 70 is installed, the first transformer 20 receives the signal applied from the measuring instrument 10 in the apparatus. The size of the signal used will be converted.

상기 제1 트랜스포머(20)에는 저항(R), 인덕턴스(L), 캐패시턴스(C)등으로 이루어지는 제1 시정수조절부(30)가 접속되며, 상기 제1 시정수조절부(30)는 제1 트랜스포머(20)로부터 인가되는 신호의 시정수를 조절하게 된다. 상기 제1 시정수조절부(30)는 인덕턴스 또는 캐패시턴스의 값을 변화시킴으로써 적절하게 시정수를 조절하게 된다. 상기 제1 시정수조절부(30)에는 SMD 쏘필터장착부(40)가 접속되며, 상기 SMD 쏘필터장착부(40)는 SMD 쏘필터(70)가 원활하게 장착되도록 시험용 SMD 쏘필터(70)의 입/출력단자 및 접지단자가 정확하게 상호접촉되도록 한다. 상기 SMD 쏘필터장착부(40)에는 제2 시정수조절부(50)가 접속되며, 상기 제2 시정수조절부(50)는 제1 시정수조절부(30)와 같은 구조로 이루어져 SMD 쏘필터(70)를 통해 출력되는 신호의 시정수를 조절하게 된다. 그리고 상기 제2 시정수조절부(50)에는 제2 트랜스포머(60)가 접속되며, 상기 제2 트랜스포머(60)는 제2 시정수조절부(50)로부터 인가되는 신호를 계측기(10)에 맞도록 변환시켜 계측기(10)에 인가하게 된다. 즉, SMD 쏘필터(70)를 통해 출력되는 신호는 기기에 알맞도록 제1 트랜스포머(20)에 의해 변환된 신호에 해당하므로 계측기(10)에 알맞는 신호로 변환시켜주어야 한다.The first time constant adjustment unit 30 is formed to the first transformer 20 is made of a resistor (R), inductance (L), capacitance (C), etc., the first time constant adjustment unit 30 is 1 The time constant of the signal applied from the transformer 20 is adjusted. The first time constant adjusting unit 30 adjusts the time constant appropriately by changing the value of inductance or capacitance. The SMD saw filter mounting portion 40 is connected to the first time constant adjustment unit 30, and the SMD saw filter mounting portion 40 is configured to smoothly mount the SMD saw filter 70. Ensure that the input and output terminals and ground terminals are correctly contacted. The second time constant adjusting unit 50 is connected to the SMD saw filter mounting unit 40, and the second time constant adjusting unit 50 has the same structure as the first time constant adjusting unit 30. The time constant of the signal output through 70 is adjusted. In addition, a second transformer 60 is connected to the second time constant adjusting unit 50, and the second transformer 60 matches a signal applied from the second time constant adjusting unit 50 to the measuring instrument 10. Is converted to apply to the measuring instrument 10. That is, since the signal output through the SMD saw filter 70 corresponds to the signal converted by the first transformer 20 to suit the device, it should be converted into a signal suitable for the measuring instrument 10.

이하, 일 실시예를 통해 본 발명을 설명하면 다음과 같다.Hereinafter, the present invention will be described through an embodiment as follows.

먼저, 이동통신용 단말기등에 장착되는 SMD 쏘필터(70)의 특성을 측정하기 위하여 특성검사장치의 SMD 쏘필터장착부(40)에 특성을 시험할 SMD 쏘필터(70)를 장착한다. 상기 SMD 쏘필터장착부(40)에 SMD 쏘필터(70)를 장착한 후 측정용 계측기(10)를 이용하여 SMD 쏘필터(70)를 측정하기 위한 신호를 출력시키게 된다. 상기 계측기(10)에서 출력되는 신호는 제1 트랜스포머(20)에 인가되고, 상기 제1 트랜스포머(20)는 계측기(10)로부터 인가된 신호를 적절한 크기로 변환시키게 된다. 예를 들면, 계측기(10)로부터 출력되는 신호의 크기는 50Ω에 해당하며, 시험용 SMD 쏘필터(70)가 장착되는 기기에서 사용되는 신호의 크기는 1㏀에 해당하므로 시험용 SMD 쏘필터(70)에 인가하는 신호는 기기에서 사용되는 크기의 신호를 인가하여야 한다. 따라서 제1 트랜스포머(20)는 계측기(10)로부터 인가되는 50Ω의 크기를 갖는 신호를 1㏀의 크기를 갖는 신호로 변환시키게 된다.First, in order to measure the characteristics of the SMD saw filter 70 mounted on the mobile communication terminal, etc., the SMD saw filter 70 to be tested is mounted on the SMD saw filter mounting part 40 of the characteristic inspection apparatus. After the SMD saw filter 70 is mounted on the SMD saw filter mounting part 40, a signal for measuring the SMD saw filter 70 is output by using the measuring instrument 10. The signal output from the meter 10 is applied to the first transformer 20, and the first transformer 20 converts the signal applied from the meter 10 to an appropriate magnitude. For example, the magnitude of the signal output from the measuring instrument 10 corresponds to 50 Hz, and the magnitude of the signal used in the apparatus equipped with the test SMD saw filter 70 corresponds to 1 Hz, so that the test SMD saw filter 70 is used. The signal applied to shall apply the signal of the magnitude used in the equipment. Accordingly, the first transformer 20 converts a signal having a magnitude of 50 dB from the meter 10 into a signal having a magnitude of 1 dB.

상기 제1 트랜스포머(20)에서 변환된 신호는 제1 시정수조절부(30)에 인가된다. 상기 제1 시정수조절부(30)는 저항(R), 인덕턴스(L) 또는 캐패시턴스(C)의 값을 조절함으로써 제1 트랜스포머(20)로부터 인가되는 신호의 시정수를 조절하게 된다. 상기 제1 시정수조절부(30)에서 설정된 시정수에 의해 조절된 신호는 SMD 쏘필터장착부(40)에 장착된 SMD 쏘필터(70)의 입력단에 인가되고, 상기 SMD 쏘필터(70)는 입력단을 통해 인가되는 신호에 의해 쏘필터의 특성에 해당하는 작동을 하게 된다. 상기 SMD 쏘필터(70)는 입력단을 통해 인가된 신호에 의해 작동을 하여 출력단을 통해 제2 시정수조절부(50)에 인가하게 된다. 상기 제2 시정수조절부(50)는 SMD 쏘필터(70)의 출력단으로부터 인가되는 신호를 설정된 시정수에 따라 조절되어 제2 트랜스포머(60)에 인가하게 된다.The signal converted by the first transformer 20 is applied to the first time constant adjusting unit 30. The first time constant adjusting unit 30 adjusts the time constant of the signal applied from the first transformer 20 by adjusting the value of the resistor R, the inductance L, or the capacitance C. The signal adjusted by the time constant set by the first time constant adjusting unit 30 is applied to an input terminal of the SMD saw filter 70 mounted on the SMD saw filter mounting unit 40, and the SMD saw filter 70 is The signal applied through the input stage operates according to the characteristics of the saw filter. The SMD saw filter 70 is operated by a signal applied through an input terminal and applied to the second time constant adjusting unit 50 through an output terminal. The second time constant adjusting unit 50 adjusts the signal applied from the output terminal of the SMD saw filter 70 according to the set time constant to be applied to the second transformer 60.

상기 제2 트랜스포머(60)는 제2 시정수조절부(50)를 통해 SMD 쏘필터(70)로부터 인가되는 신호의 크기가 500Ω에 해당하므로 계측기(10)에 인가할 수 있는 신호의 크기인 50Ω의 크기를 갖는 신호로 변환시키게 된다. 상기 제2 트랜스포머(60)에서 변환된 신호는 계측기(10)에 인가된다. 상기 계측기(10)는 제2 트랜스포머(60)로부터 인가되는 신호를 비교분석하여 표시부(도시 안됨)에 SMD 쏘필터(70)의 특성에 해당하는 신호를 디스플레이시키게 된다. 따라서 시험용 SMD 쏘필터(70)의 특성을 정확하게 확인할 수 있다.The second transformer 60 has a magnitude of a signal that can be applied to the measuring instrument 10 because the magnitude of the signal applied from the SMD saw filter 70 through the second time constant adjusting unit 50 corresponds to 500 Hz. The signal is converted into a signal having a magnitude of. The signal converted by the second transformer 60 is applied to the measuring instrument 10. The measuring instrument 10 compares and analyzes a signal applied from the second transformer 60 to display a signal corresponding to the characteristics of the SMD saw filter 70 on a display unit (not shown). Therefore, the characteristics of the test SMD saw filter 70 can be accurately confirmed.

이상 설명에서 알 수 있는 바와 같이, 본 발명은 SMD 쏘필터의 특성을 측정하는 측정용 계측기에 제1 및 제2 트랜스포머, 제1 및 제2 시정수조절부 그리고 SMD 쏘필터장착부로 이루어지는 특성검사장치를 연결함으로써 시험할 SMD 쏘필터의 회로조건을 만족시키게 된다. 상기 특성검사장치의 SMD 쏘필터장착부에 시험용 SMD 쏘필터를 착설시킨다. 상기 SMD 쏘필터장착부에 SMD 쏘필터를 착설시킨 후 계측기를 이용하여 특성검사장치에 테스트용 신호를 인가하면 제1 트랜스포머 및 제1 시정수조절부를 통해 시험용 SMD 쏘필터에 신호가 인가된다. 상기 시험용 SMD 쏘필터를 통과한 신호는 제2 시정수조절부 및 제2 트랜스포머를 통해 신호가 변환되어 계측기에 인가되면 계측기는 특성검사장치로부터 인가되는 신호를 표시부에 디스플레이시키게 되므로 SMD 쏘필터의 특성을 정확하게 확인할 수 있다.As can be seen from the above description, the present invention is characterized in that the measuring instrument for measuring the characteristics of the SMD saw filter comprising a first and second transformer, the first and second time constant control unit and the SMD saw filter mounting unit The circuit condition of the SMD saw filter to be tested is satisfied by connecting. The SMD saw filter for testing is installed in the SMD saw filter mounting part of the said characteristic test apparatus. When the SMD saw filter is installed in the SMD saw filter mounting unit and the test signal is applied to the characteristic inspection apparatus using a measuring instrument, the signal is applied to the test SMD saw filter through the first transformer and the first time constant adjusting unit. When the signal passing through the test SMD saw filter is converted into a signal through the second time constant adjusting unit and the second transformer and is applied to the measuring instrument, the measuring instrument displays a signal applied from the characteristic inspecting device on the display unit. You can check exactly.

Claims (1)

SMD 쏘필터의 특성을 측정하는 신호를 입/출력하는 측정용 계측기(10);A measuring instrument 10 for inputting / outputting a signal for measuring characteristics of the SMD saw filter; 상기 계측기(10)로부터 인가되는 신호를 SMD 쏘필터(70)가 채택되는 기기의 전압신호에 맞도록 변환시켜주는 제1 트랜스포머(20);A first transformer (20) for converting the signal applied from the measuring instrument (10) to match the voltage signal of the device adopting the SMD saw filter (70); 상기 제1 트랜스포머(20)에 접속되며, 저항(R), 인덕턴스(L), 캐패시턴스(C)등으로 이루어져 제1 트랜스포머(20)로부터 인가되는 신호의 시정수를 조절하는 제1 시정수조절부(30);A first time constant adjusting unit connected to the first transformer 20 and configured to include a resistor R, an inductance L, a capacitance C, and the like, to adjust a time constant of a signal applied from the first transformer 20. 30; 상기 제1 시정수조절부(30)에 접속되며, SMD 쏘필터(70)가 장착되는 SMD 쏘필터장착부(40);An SMD saw filter mounting unit 40 connected to the first time constant adjusting unit 30 and equipped with an SMD saw filter 70; 상기 SMD 쏘필터장착부(40)에 접속되며, SMD 쏘필터(70)를 통해 출력되는 신호의 시정수를 조절하는 제2 시정수조절부(50); 그리고A second time constant adjusting unit 50 connected to the SMD saw filter mounting unit 40 and adjusting a time constant of a signal output through the SMD saw filter 70; And 상기 제2 시정수조절부(50)에 접속되며, 제2 시정수조절부(50)로부터 인가되는 신호를 계측기(10)에 맞도록 변환시켜 계측기(10)에 인가하는 제2 트랜스포머(60)로 이루어지는 SMD 쏘필터의 특성검사장치.A second transformer 60 connected to the second time constant adjusting part 50 and converting a signal applied from the second time constant adjusting part 50 to fit the measuring device 10 and applying the same to the measuring device 10. Characteristic inspection apparatus for SMD saw filter.
KR1019970072405A 1997-12-23 1997-12-23 Device for testing characteristic of amd saw filter Expired - Fee Related KR100258996B1 (en)

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