1227782 玖、發明說明： 【發明所屬之技術領域】 本發明係一種頻譜量測系統’尤指一種可以極低之建構成本，利用市面上常 見之零組件及功率計加以組配安裝’再搭配一台個人電腦，製作出之頻譜量測系 統。 【先前技術】 近年來，網際網路(Internet)蓬勃發展，尤其是world Wide Web (簡稱WWW)， 除了提供傳統之電子郵件傳輸服務外，還結合了語音、圖片及動態影像等各式各 樣之多媒體服務，伴隨著該等多媒體服務而來的，係極爲龐大之資料量，因此各 式高效率之網路通訊產品乃應運而生，其中尤以無線通訊產品最受市場囑目。 按，無線通訊業者爲設計及製造出高品質之無線通訊產品，並保證該等通訊 產品所佔用之頻道寬度均符合規格要求，均會在該等無線通訊產品出廠前，對其 進行頻譜訊號之量測及分析，以確保所製造出之產品，均爲符合規格要求之良品。 爲達成此一目的，業者均必須耗費鉅資，在每一個生產線上，建立一頻譜測試站， 每一頻譜測試站均需安裝一部頻譜分析儀（Spectrum Analyzer)，以利用該頻譜分 析儀對製作完成之無線通訊產品，進行頻譜訊號之量測及分析。 一般言，每一部用以進行頻譜量測之頻譜分析儀，均動輒需耗費新台幣百萬 元以上之經費，故在數條生產線上分別建立一頻譜測試站，往往需花費近千萬甚 至超過千萬之費用，導致生產線之架設成本，始終高居不下，難以降低，對於經 費不足之業者而言，自然望之卻步，而不敢遽然擴充生產線，以增加產能，致訂 單滿載時，常因而延誤了產品出貨之時間。 【發明内容】 • 有鑑於前述傳統頻譜分析儀價格昂貴’導致無線通訊產品製造成本過高之問 題，發明人乃根據多年之實務經驗及硏究心得，硏發出本發明之一種由個人電腦 及功率計所組成之頻譜量測系統，期藉由該頻譜量測系統之低成本、操作簡便及 維護容易之特點，有效降低無線通訊產品在自動化生產過程中所需之大量且昂貴 1227782 之測試儀器採購成本，以有效提昇產品之競爭力。 本發明之一目的，係在利用一預先放大器，對一待測無線通訊產品所輸入之 訊號，進行預先放大，再經一降頻器將放大後之該輸入訊號，降頻爲中頻訊號， 再經由一中頻濾波器，依所設定之頻率解析度，對其進行中頻濾波，再透過一功 率計量測其功率値，最後，再利用一個人電腦讀取該功率計所量測到之功率數據， 並將所讀取到之檢測頻率，依預先建立之一頻譜訊號校正表，轉換爲實際頻率， 再以該實際頻率作爲頻率軸，以該功率數據作爲功率軸，即可繪製出該待測無線 通訊產品之頻譜訊號分析圖。 本發明之另一目的，係在該頻譜量測系統中，設有一掃描電路，俾該個人電 腦可依該待測無線通訊產品之輸入訊號及檢測時所需之中頻頻率，控制該掃描電 路產生所需之波形，以控制一壓控振盪器之振盪頻率，令該壓控振盪器產生一在 預定頻率範圍內呈線性來回掃描之本地振盪頻率。 本發明之又一目的，係在建立該頻譜訊號之校正表時，係將一已完成檢測且 頻道寬度均符合規格要求之某一系列無線通訊產品，與本發明之該頻譜量測系統 相連接，俾該個人電腦可根據所讀取之掃描頻率及功率數據，與該無線通訊產品 已知之實際頻譜訊號，對照形成所需之一頻譜訊號校正表。 【實施方式】 本發明係一種由個人電腦及功率計所組成之頻譜量測系統，參閱第1圖所示， 該頻譜量測系統係利用一預先放大器(preamplifier)20，接收一待測無線通訊產品10 所輸入之訊號，並對該輸入訊號進行預先放大，嗣再經一降頻器(Down Converter)21，將放大後之該輸入訊號降頻成爲中頻訊號，該中頻訊號再經由一中 頻濾波器(IF Hlter)22，依所設定之頻率解析度，對其進行中頻濾波，以獲得檢測 該無線通訊產品10時所需之中頻訊號，嗣，再透過一功率計(Power Meter)30，即 可將該中頻訊號之功率量測出來。因此，在本發明中僅需再利用一台個人電腦50， 透過一控制界面(Control Interface 1 ’讀取該功率計30所量測到之功率數據，並 將所讀取到之檢測頻率，依預先建立之一頻譜訊號校正表，轉換爲實際頻率，再 以該實際頻率作爲頻率軸，以該功率數據作爲功率軸，即可繪製出該待測無線通 訊產品之頻譜訊號分析圖。 1227782 本發明爲避免在對該無線通訊產品10進行檢測時，因各該元件所產生之累 積誤差，影響頻譜訊號檢測結果之真實性，在對待檢測產品進行檢測前，必需先 對該頻譜量測系統進ί了系統校正(Calibration)，以建立一頻譜訊號校正表(Calibration Table)。因此，該頻譜量測系統中，另設有一掃描電路(SweeperHl，該掃描電路41 係透過另一控制界面(Control Interfaced與該個人電腦50相連接，以接受該個人 電腦50之控制，產生所需之波形(如：一鋸齒波），並將該波形傳送至一壓控振盪 器42 (VC0)，以控制該壓控振盪器42之振盪頻率，令該壓控振盪器42產生一在 預定頻率範圍內呈線性來回掃描之本地振盪頻率，因此，該個人電腦50必需依該 待測無線通訊產品1〇之輸入訊號及檢測時所需之中頻頻率，來控制該掃描電路 41，俾該掃描電路41所產生之波形，可令該壓控振盪器42產生所需之振盪頻率 範圍。 本發明在建立該頻譜訊號校正表(Calibmtian Table)時，係將一已完成檢測且 頻道寬度均符合規格要求之某一系列無線通訊產品10，與本發明之該頻譜量測系 統相連接，俾該個人電腦50可根據所讀取到之檢測頻譜訊號，與該無線通訊產品 10已知之實際頻譜訊號，對照形成所需之一頻譜訊號校正表。在本發明之一最佳 實施例中，該頻譜量測系統係先針對一已完成檢測且頻道寬度均符合規格要求之 802.11b無線網路卡，進行檢測，令該個人電腦50根據該無線網路卡上已知之中 心頻率2412MHz，透過該另一控制界面40，發出一控制訊號，令該掃描電路41 產生所需之一波形，以控制該壓控振盪器42產生一在2412MHz - 150MHz - 22MHZ 到2412MHz -150MHz + 22MHz間呈線性來回掃描之振盪頻率，此時，該無線網 路卡輸入至該預先放大器20之訊號，經預先放大後，再經該降頻器21(或混波器) 與該壓控振盪器42所產生之振盪頻率混波，此時，若將該中頻濾波器22之中心 頻率設定爲150 MHz，且頻寬設定爲1MHz，則降頻成爲中頻訊號之輸入訊號， 經該中頻濾波器22濾波後，將得到頻率解析度爲1MHz，且中心頻率爲15〇 MHz 之檢測頻譜値。此時，該個人電腦50即可根據自該功率計30所讀取到之檢測頻 譜訊號，與該無線網路卡已知之實際頻譜訊號，對照形成下表所示之一頻譜訊號 校正表： 實際頻率 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 (MHz) 1227782 檢測頻率 (MHz) 128 129 130 131 132 133 134 135 136 137 138 實際頻率 (MHz) 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 檢測頻率 (MHz) 139 140 141 142 143 144 145 146 147 148 149 實際頻率 (MHz) 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 檢測頻率 (MHz) 150 151 152 153 154 155 156 157 158 159 160 實際頻率 (MHz) 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 檢測頻率 (MHz) 161 162 163 164 165 166 167 168 169 170 171 實際頻率 (MHz) 2434 檢測福率 (MHz) 172 如此，當使用該頻譜量測系統對同一系列之待測無線網路卡，進行檢測時， 即可令該個人電腦50透過該另一控制界面40，發出相同之控制訊號，令該掃描 電路41產生所需之波形，以控制該壓控振盪器42產生一在2412MHz - 150MHz -22MHZ到2412MHz -150MHz + 22MHz間呈線性來回掃描之振盪頻率，使得該無 線網路卡所輸入之訊號，被該預先放大器20預先放大後，經該降頻器21與該壓 控振盪器42所產生之振盪頻率混波降頻後，再經該中頻濾波器22濾波，即可得 到頻率解析度爲1MHz，且中心頻率爲150 MHz之檢測頻譜値，嗣，再透過該功 率計30 (Power Meter)將該中頻訊號之功率量測出來，該個人電腦50即可讀取到 下表所示之該待測無線網路卡之檢測頻率及功率數據： 檢測頻率 (MHz) 128 129 130 131 132 133 134 135 136 137 138 卓 (dBm) -35 -30 -28 -24 -20 -16 -14 -13 -14 -14 -16 檢測頻率 (MHz) 139 140 141 142 143 144 145 146 147 148 149 远率 (dBm) -20 -26 -10 5 10 14 17 18 19 18 19 檢測頻率 (MHz) 150 151 152 153 154 155 156 157 158 159 160 远率 (dBm) 19 19.1 18.2 18.5 18 16 15 10 0 -10 -25 檢測頻率 (MHz) 161 162 163 164 165 166 167 168 169 170 171 1227782 功率 (dBm) -20 -18 -15 -14 -13 -14 -15 -17 -20 <25 -30 1食測頻率 (MHz) 172 獅 (dBm) -35 此時，該個人電腦50可根據所讀取到之檢測頻率及功率數據’以該檢測頻 率作爲X軸，即相當於頻率軸，以該功率數據作爲Y軸，即相當於功率軸，繪製 出該待測無線網路卡之頻譜訊號檢測圖，該頻譜訊號檢測圖經由前述預先建立之 頻譜訊號校正表，即可將檢測頻率轉換爲實際頻率，並據以製作出該待測無線網 路卡之實際頻譜訊號分析圖，參閱第2圖所示。 據上所述可知，本發明僅需利用市面上常見之零組件加以組配安裝，再搭配 一台個人電腦，即可以極低之建構成本，製作出所需之頻譜量測系統，該頻譜量 測系統不僅操作簡便，各相關零件之取得、組裝及維修保養容易，且所量測出之 掃描頻率及功率數據，及所製成之該實際頻譜訊號分析圖，均已足以作爲各該無 線通訊產品之設計及製造廠商，用以檢測各式無線通訊產品所佔用之頻道寬度， 並據以判斷是否符合規格要求。 以上所述，僅係本發明之較佳實施例，惟，本發明所主張之權利範圍，並不 局限於此，按凡熟悉該項技藝人士，依據本發明所揭露之技術內容，可輕易思及 之等效變化，均應屬不脫離本發明之保護範疇。 【圖式簡單說明】 圖式說明： 第1圖所示乃本發明之頻譜量測系統之電路方塊示意圖； 第2圖所示乃本發明之一最佳實施例所製作出之一待測無線網路卡之實際頻譜訊 號分析圖。 .主要部分之代表符號： 無線通訊產品 預先放大器… •…"20 降頻器 中頻濾波器 … •…·· 22 功率計 …·, 控制界面 … •…"31 1227782 另一控制界面 ............40 壓控振盪器 ............42 掃描電路 個人電腦1227782 发明 Description of the invention: [Technical field to which the invention belongs] The present invention is a spectrum measurement system 'especially a type with extremely low construction cost, which can be assembled and installed using common components and power meters on the market' A personal computer, a spectrum measurement system. [Previous technology] In recent years, the Internet has flourished, especially the World Wide Web (WWW). In addition to providing traditional e-mail transmission services, it also combines a variety of voice, pictures, and dynamic images. The multimedia services that accompany these multimedia services are extremely large amounts of data. Therefore, a variety of high-efficiency network communication products have emerged at the historic moment. Among them, wireless communication products are the most sought after by the market. According to the wireless communication industry, in order to design and manufacture high-quality wireless communication products, and to ensure that the channel width occupied by these communication products meets the specifications, they will perform spectrum signal analysis on these wireless communication products before leaving the factory. Measurement and analysis to ensure that the products manufactured are good products that meet the specifications. In order to achieve this goal, operators must spend huge sums of money to establish a spectrum test station on each production line. Each spectrum test station needs to install a Spectrum Analyzer to use the spectrum analyzer to The completed wireless communication products are used for measurement and analysis of spectrum signals. Generally speaking, each spectrum analyzer used for spectrum measurement will cost NT $ 1 million or more. Therefore, setting up a spectrum test station on several production lines often costs nearly 10 million or even The cost of more than ten million yuan has caused the cost of erection of the production line to remain high and difficult to reduce. For those with insufficient funds, it is naturally prohibitive, and they dare not expand the production line in order to increase production capacity. Delayed product shipments. [Summary of the Invention] In view of the problem that the aforementioned traditional spectrum analyzer is expensive, which leads to the excessively high manufacturing cost of wireless communication products, the inventor has based on many years of practical experience and research experience to develop a personal computer and power of the present invention. The spectrum measurement system composed of the meter is expected to effectively reduce the large and expensive purchase of 1227782 test equipment required for wireless communication products in the automated production process by virtue of the low cost, simple operation and easy maintenance of the spectrum measurement system. Cost to effectively enhance the competitiveness of the product. One object of the present invention is to use a pre-amplifier to pre-amplify a signal input from a wireless communication product under test, and then reduce the amplified input signal to an intermediate frequency signal through a frequency downconverter. Then pass an IF filter to filter the IF according to the set frequency resolution, and then measure its power through a power measurement. Finally, use a personal computer to read the power measured by the power meter. Power data, and convert the read detection frequency to a real frequency according to a pre-established spectrum signal correction table, and then use the actual frequency as the frequency axis and the power data as the power axis to draw the Spectrum signal analysis chart of wireless communication products under test. Another object of the present invention is to provide a scanning circuit in the spectrum measurement system. The personal computer can control the scanning circuit according to the input signal of the wireless communication product to be tested and the intermediate frequency required for detection. Generate the required waveform to control the oscillation frequency of a voltage-controlled oscillator, so that the voltage-controlled oscillator generates a local oscillation frequency that linearly sweeps back and forth within a predetermined frequency range. Another object of the present invention is to connect a certain series of wireless communication products that have completed the detection and the channel width meets the specifications when establishing the calibration table of the spectrum signal, and the spectrum measurement system of the present invention. According to the scanned frequency and power data, the personal computer can compare with the actual spectrum signal known to the wireless communication product to form a required spectrum signal correction table. [Embodiment] The present invention is a spectrum measurement system composed of a personal computer and a power meter. As shown in FIG. 1, the spectrum measurement system uses a preamplifier 20 to receive a wireless communication under test. The input signal of product 10 is pre-amplified, and then a down converter 21 is used to down-convert the amplified input signal into an IF signal. The IF signal is then passed through a Intermediate frequency filter (IF Hlter) 22, according to the set frequency resolution, IF filter it to obtain the IF signal required to detect the wireless communication product 10, 嗣, and then through a power meter (Power Meter) 30 to measure the power of the IF signal. Therefore, in the present invention, it is only necessary to use a personal computer 50 again to read the power data measured by the power meter 30 through a control interface (Control Interface 1 ', and then read the detected frequency according to A spectrum signal correction table is established in advance, converted into an actual frequency, and then using the actual frequency as a frequency axis and the power data as a power axis, a spectrum signal analysis chart of the wireless communication product under test can be drawn. 1227782 The present invention In order to avoid the cumulative error generated by each component when testing the wireless communication product 10, which affects the authenticity of the detection result of the spectrum signal, the spectrum measurement system must be upgraded before testing the product to be tested. System calibration is performed to establish a spectrum signal calibration table. Therefore, the spectrum measurement system is provided with a scanning circuit (SweeperH1). The scanning circuit 41 is controlled by another control interface (Control Interfaced and Control Interfaced). The personal computer 50 is connected to receive the control of the personal computer 50 to generate a desired waveform (eg, a sawtooth wave), and the The voltage is transmitted to a voltage-controlled oscillator 42 (VC0) to control the oscillation frequency of the voltage-controlled oscillator 42 so that the voltage-controlled oscillator 42 generates a local oscillation frequency that linearly sweeps back and forth within a predetermined frequency range. The personal computer 50 must control the scanning circuit 41 according to the input signal of the wireless communication product 10 to be tested and the intermediate frequency required for detection, and the waveform generated by the scanning circuit 41 can make the voltage-controlled oscillation The generator 42 generates the required oscillating frequency range. When the present invention establishes the Calimtian Table, it is a series of wireless communication products 10 that have completed the detection and the channel width meets the specifications. The spectrum measurement system is connected, and the personal computer 50 can compare with the actual spectrum signal known to the wireless communication product 10 according to the read spectrum signal to form a required spectrum signal correction table. In a preferred embodiment of the invention, the spectrum measurement system first detects an 802.11b wireless network card that has completed the detection and the channel width meets the specifications. The personal computer 50 is caused to send a control signal through the other control interface 40 according to a known center frequency of 2412 MHz on the wireless network card, so that the scanning circuit 41 generates a required waveform to control the voltage-controlled oscillator. 42 generates an oscillating frequency that sweeps linearly back and forth between 2412MHz-150MHz-22MHZ to 2412MHz -150MHz + 22MHz. At this time, the signal input by the wireless network card to the preamplifier 20 is pre-amplified and then passes through the The frequency converter 21 (or mixer) mixes with the oscillating frequency generated by the voltage-controlled oscillator 42. At this time, if the center frequency of the IF filter 22 is set to 150 MHz, and the bandwidth is set to 1 MHz, Then the frequency reduction becomes the input signal of the intermediate frequency signal. After filtering by the intermediate frequency filter 22, a detection spectrum 値 having a frequency resolution of 1 MHz and a center frequency of 15 MHz will be obtained. At this time, the personal computer 50 can form a spectrum signal correction table as shown in the following table based on the detected spectrum signal read from the power meter 30 and the actual spectrum signal known by the wireless network card. Frequency 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 (MHz) 1227782 Detection frequency (MHz) 128 129 130 131 132 133 134 135 136 137 138 138 Actual frequency (MHz) 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 Detection frequency (MHz) 139 140 141 142 143 144 145 146 147 148 149 Actual frequency (MHz) 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 Detection frequency (MHz) 150 151 152 153 154 155 156 157 158 159 160 Actual frequency (MHz ) 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 Detection Frequency (MHz) 161 162 163 164 165 166 167 168 169 170 171 Actual Frequency (MHz) 2434 Detection Blessing Rate (MHz) 172 So, when using this spectrum measurement system When the wireless network card under test of the same series is detected, the personal computer 50 can send the same control through the other control interface 40 Signal to cause the scanning circuit 41 to generate the required waveform to control the voltage-controlled oscillator 42 to generate an oscillation frequency that sweeps linearly back and forth between 2412MHz-150MHz -22MHZ to 2412MHz -150MHz + 22MHz, so that the wireless network card The input signal is pre-amplified by the pre-amplifier 20, mixed with the oscillating frequency generated by the down-converter 21 and the voltage-controlled oscillator 42, and then filtered by the IF filter 22, Obtain the detection spectrum 频率 with a frequency resolution of 1 MHz and a center frequency of 150 MHz. Then, measure the power of the IF signal through the Power Meter 30 (Power Meter), and the personal computer 50 can read it. The following table shows the detection frequency and power data of the wireless network card under test: Detection frequency (MHz) 128 129 130 131 132 133 134 135 136 137 138 Zhuo (dBm) -35 -30 -28 -24 -20- 16 -14 -13 -14 -14 -16 Detection frequency (MHz) 139 140 141 142 143 144 145 146 147 148 149 Long range (dBm) -20 -26 -10 5 10 14 17 18 19 18 19 19 Detection frequency (MHz ) 150 151 152 153 154 155 156 157 158 159 160 Distance (dBm) 19 19.1 18.2 18.5 18 16 15 10 0 -10 -25 Detection frequency (MHz) 161 162 163 164 165 166 167 168 169 170 171 1227782 Power (dBm) -20 -18 -15 -14 -13 -14 -15 -17 -20 < 25- 30 1 Test frequency (MHz) 172 Lion (dBm) -35 At this time, the personal computer 50 may use the detection frequency as the X axis, which is equivalent to the frequency axis, based on the detected detection frequency and power data. The power data is used as the Y axis, which is equivalent to the power axis. The spectrum signal detection chart of the wireless network card under test is drawn. The spectrum signal detection chart can be converted into the detection frequency through the previously established spectrum signal correction table. Based on the actual frequency, an actual spectrum signal analysis chart of the wireless network card under test is produced, as shown in FIG. 2. According to the above description, the present invention only needs to use common components on the market for assembly and installation, and then a personal computer, which can produce a required spectrum measurement system at a very low construction cost. The measurement system is not only easy to operate, but also easy to obtain, assemble and maintain the relevant parts. The measured scanning frequency and power data, as well as the analysis chart of the actual spectrum signal, are sufficient for each wireless communication. The design and manufacture of the product is used to detect the channel width occupied by various wireless communication products and to determine whether it meets the specifications. The above are only the preferred embodiments of the present invention. However, the scope of the rights claimed by the present invention is not limited to this. According to those skilled in the art, the technical content disclosed by the present invention can be easily considered. And equivalent changes should all belong to the protection scope of the present invention. [Brief description of the drawings] Description of the drawings: Figure 1 shows a schematic circuit block diagram of the spectrum measurement system of the present invention; Figure 2 shows a wireless device to be tested made by a preferred embodiment of the present invention. The actual spectrum signal analysis chart of the network card. .Representative symbols of the main parts: Pre-amplifier for wireless communication products… •… " 20 Frequency reducer IF filter… •… · 22 Power meter… ·, Control interface… •… " 31 1227782 Another control interface. ........... 40 Voltage Controlled Oscillator ......... 42 Scanning Circuit Personal Computer