JPH1164405A - Modulation analysis device and spectrum analyzer - Google Patents
Modulation analysis device and spectrum analyzerInfo
- Publication number
- JPH1164405A JPH1164405A JP9223474A JP22347497A JPH1164405A JP H1164405 A JPH1164405 A JP H1164405A JP 9223474 A JP9223474 A JP 9223474A JP 22347497 A JP22347497 A JP 22347497A JP H1164405 A JPH1164405 A JP H1164405A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- attenuation
- power
- attenuated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、被測定周波数信
号の入力レベルの最適化に関する。特にスペクトラム拡
散された広帯域に分布する被測定周波数信号の入力レベ
ルの最適化に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to optimization of an input level of a frequency signal to be measured. In particular, the present invention relates to optimization of an input level of a frequency signal to be measured distributed over a wide band which is spread spectrum.
【０００２】[0002]
【従来の技術】従来技術例について図５の変調解析装置
の構成図を示して説明する。この変調解析装置は、スペ
クトラムアナライザを基本構成にし、この中間周波数信
号（ＩＦ信号）を受けて、被測定信号の各種変調に関わ
る解析機能を付加した構成例である。2. Description of the Related Art A prior art example will be described with reference to a block diagram of a modulation analyzer shown in FIG. This modulation analyzer has a spectrum analyzer as a basic configuration, receives this intermediate frequency signal (IF signal), and adds an analysis function relating to various types of modulation of a signal under measurement.
【０００３】構成は、被試験装置１００と、入力減衰器
５０と、周波数変換部６０と、ＩＦフィルタ７０と、可
変ゲインアンプ７２と、対数変換部７４と、検波部７６
と、ＡＤ変換器７８と、変調解析部８０と、表示処理部
１２０と、表示装置１４０とで成る。尚、スペクトラム
アナライザの構成は技術的に良く知られている為説明を
省略する。[0003] The configuration includes a device under test 100, an input attenuator 50, a frequency converter 60, an IF filter 70, a variable gain amplifier 72, a logarithmic converter 74, and a detector 76.
, An AD converter 78, a modulation analysis unit 80, a display processing unit 120, and a display device 140. Since the configuration of the spectrum analyzer is well known in the art, the description is omitted.
【０００４】変調解析部８０の内部構成は、周波数変換
部８２と、可変ゲインアンプ８４と、ＡＤ変換器９０
と、信号処理部９８とで成る。この変調解析部は、周波
数変換部８２により数ＭＨｚの低い中間周波数信号ＩＦ
２に変換し、可変ゲインアンプ８４でＡＤ変換器９０の
最適レベルに増幅した中間周波数信号をＡＤ変換器９０
で高速サンプリングし、信号処理して各種の変調特性等
の解析や変調精度に係る測定と演算処理をするものであ
る。処理された結果は表示処理部１２０を介して表示装
置１４０で所望の表示をする。[0004] The internal configuration of the modulation analysis section 80 is as follows: a frequency conversion section 82, a variable gain amplifier 84, an AD converter 90.
And a signal processing unit 98. This modulation analysis unit uses a frequency conversion unit 82 to output a low intermediate frequency signal IF of several MHz.
2 and the intermediate frequency signal amplified by the variable gain amplifier 84 to the optimum level of the AD converter 90
, Performs high-speed sampling, performs signal processing, analyzes various modulation characteristics and the like, and performs measurement and arithmetic processing relating to modulation accuracy. The processed result is displayed on the display device 140 via the display processing unit 120 as desired.
【０００５】ところで変調測定に際して表示装置１４０
の管面上の表示レベルを使用者が定める必要がある。こ
の管面レベルを設定する一手順を説明する。ここで被試
験装置１００が出力する被測定信号１０１は、図６
（ａ）に示す周波数信号２０１のように、ＣＤＭＡ（Co
de Division Multiple Access）等の広帯域に分布する
スペクトラム拡散された周波数信号の場合と仮定する。
先ず図６（ａ）に示す中心周波数ｆc付近に設定し、ゼ
ロスパン・モード（周波数を掃引しないモード）で入力
レベルを管面表示させる。そしてキー入力設定により、
スペクトラムレベルが大きく見易くなる所望の入力感度
及びリファレンスレベルに設定する。この設定の結果入
力減衰器５０とＩＦ信号用の可変ゲインアンプ７２は所
定の減衰量及び増幅量に自動設定される。尚、入力減衰
器５０は例えば１０ｄＢステップの減衰器であり、可変
ゲインアンプ７２は例えば０．１ｄＢ／Ｄiv．ステップ
の細かな可変増幅器である。[0005] By the way, at the time of modulation measurement, the display device 140
It is necessary for the user to determine the display level on the display screen. One procedure for setting the tube surface level will be described. The signal under test 101 output from the device under test 100 is shown in FIG.
As in the frequency signal 201 shown in FIG.
It is assumed that the signal is a spread-spectrum frequency signal distributed over a wide band such as de Division Multiple Access.
First, the input level is set near the center frequency fc shown in FIG. 6A, and the input level is displayed on the display panel in the zero span mode (mode in which the frequency is not swept). And by key input setting,
The desired input sensitivity and reference level are set so that the spectrum level is large and easy to see. As a result of this setting, the input attenuator 50 and the variable gain amplifier 72 for the IF signal are automatically set to predetermined attenuation and amplification amounts. The input attenuator 50 is, for example, an attenuator of 10 dB steps, and the variable gain amplifier 72 is, for example, 0.1 dB / Div. It is a variable amplifier with fine steps.
【０００６】[0006]
【発明が解決しようとする課題】ところで、図６（ａ）
に示すように、広帯域に分散した周波数信号２０１の
為、各周波数点でのレベルは低い。この為、上述管面表
示レベルの設定に伴って、入力減衰器５０の設定は小さ
い減衰量になっている。しかしながら広帯域に拡散した
全周波数の総電力は大きいレベルである。この結果、図
５に示す入力減衰器５０で減衰した未知電力減衰信号５
１は比較的大きなレベルである。この信号が周波数変換
部６０のミキサ回路の入力端に供給される。この結果、
ミキサ回路は過大な入力レベルとなる場合がある。もし
過大入力レベルの場合は、被測定周波数信号が歪んでＮ
次高調波を生じたり、周波数変換ゲインの直線性が大き
く変わる等の不具合を生じる。これら不具合は、被試験
装置の変調解析や電力測定の誤差を増長させる為、測定
装置としては好ましくなく、実用上の難点がある。尚、
図５に示す変調解析部８０を有しない一般的なスペクト
ラムアナライザにおいても広帯域に分布あるいは離散し
た未知電力の周波数信号等においては、同様の難点があ
ることは言うまでもない。FIG. 6 (a)
As shown in (1), the level at each frequency point is low because of the frequency signal 201 distributed over a wide band. Therefore, the setting of the input attenuator 50 is set to a small amount of attenuation in accordance with the setting of the above-described display surface level. However, the total power of all frequencies spread over a wide band is at a large level. As a result, the unknown power attenuated signal 5 attenuated by the input attenuator 50 shown in FIG.
1 is a relatively large level. This signal is supplied to the input terminal of the mixer circuit of the frequency conversion unit 60. As a result,
The mixer circuit may have an excessive input level. If the input level is excessive, the measured frequency signal is distorted and N
Inconveniences such as generation of second-order harmonics and significant change in linearity of frequency conversion gain occur. These disadvantages increase errors in modulation analysis and power measurement of the device under test, and therefore are not preferable as a measuring device and have practical problems. still,
It goes without saying that even a general spectrum analyzer having no modulation analysis unit 80 shown in FIG. 5 has the same disadvantages in frequency signals of unknown power distributed or dispersed over a wide band.
【０００７】そこで、本発明が解決しようとする課題
は、広帯域に分布あるいは離散した被測定周波数信号に
おいても入力レベルの最適化を実現可能とした変調解析
装置及びスペクトラムアナライザを提供することであ
る。It is an object of the present invention to provide a modulation analyzer and a spectrum analyzer which can realize an input level optimization even for a frequency signal to be measured distributed or dispersed over a wide band.
【０００８】[0008]
【課題を解決するための手段】第１図あるいは第２図と
第１０図は、本発明の変調解析装置に係る解決手段を示
している。第１に、上記課題を解決するために、本発明
の構成では、未知電力の被測定信号１０１を受けて、入
力減衰器５０により減衰させ、減衰した未知電力減衰信
号５１を受けて周波数変換部６０で所定の中間周波数Ｉ
Ｆ１に周波数変換し、これをＩＦフィルタ７０によりフ
ィルタし、変調解析部８０に供給して変調解析を行う変
調解析装置において、入力減衰器５０によって減衰した
未知電力減衰信号５１を受けて、この信号を増幅し検波
して入力減衰器５０の出力端における未知電力レベルを
検出する手段を具備し、第１に上記未知電力検出手段で
得た電力レベル値が所定上限値より高い場合は入力減衰
器５０の減衰量を増加する方向に減衰レンジを設定制御
し、第２に上記未知電力検出手段で得た電力レベル値が
所定下限値より低い場合は入力減衰器５０の減衰量を減
少する方向に減衰レンジを設定制御する粗調整の手段を
具備し、上述で得た減衰レンジ及び前後の減衰レンジに
おいて、被測定信号１０１のパワー測定帯域を含む区間
を周波数変換部６０で周波数掃引して被測定信号１０１
の電力を各々測定算出し、この測定電力値から最適な減
衰レンジに設定制御する最適調整の手段を具備し、上記
減衰レンジの設定に連動して中間周波数の可変ゲインア
ンプ７２のゲインを制御して測定系全体のゲインを所定
の状態にゲイン制御する手段を具備する構成手段であ
る。上述粗調整と最適調整の手段により、広帯域に分布
した被測定周波数信号に対しても入力レベルの最適化を
実現可能とした変調解析装置が実現できる。FIG. 1 or FIG. 2 and FIG. 10 show the means for solving the problems related to the modulation analyzer of the present invention. First, in order to solve the above-mentioned problem, in the configuration of the present invention, the frequency conversion unit receives the signal under measurement 101 of unknown power, attenuates it by the input attenuator 50, and receives the attenuated unknown power attenuation signal 51. 60 and a predetermined intermediate frequency I
F1 is frequency-converted, filtered by an IF filter 70, and supplied to a modulation analysis unit 80 to perform modulation analysis. The modulation analysis device receives the unknown power attenuated signal 51 attenuated by the input attenuator 50. Amplifying and detecting the unknown power level at the output terminal of the input attenuator 50. First, when the power level value obtained by the unknown power detecting means is higher than a predetermined upper limit, the input attenuator is detected. Second, the attenuation range is set and controlled in a direction to increase the attenuation amount of the input attenuator 50. If the power level value obtained by the unknown power detection means is lower than a predetermined lower limit value, the attenuation amount of the input attenuator 50 is reduced. A coarse adjustment means for setting and controlling the attenuation range is provided. In the attenuation range obtained above and before and after the attenuation range, the section including the power measurement band of the signal under test 101 is converted to the frequency conversion unit 6. In a frequency sweep to the signal to be measured 101
Of the variable gain amplifier 72 at the intermediate frequency in conjunction with the setting of the attenuation range. Means for controlling the gain of the entire measurement system to a predetermined state. By means of the coarse adjustment and the optimal adjustment described above, it is possible to realize a modulation analyzer capable of optimizing an input level even for a frequency signal to be measured distributed over a wide band.
【０００９】第４図は、本発明のスペクトラムアナライ
ザに係る解決手段を示している。第２に、上記課題を解
決するために、本発明の構成では、未知電力の被測定信
号１０１を受けて、入力減衰器５０により減衰させ、減
衰した未知電力減衰信号５１を受けて周波数変換部６０
で所定の中間周波数ＩＦ１に周波数変換し、これをＩＦ
フィルタ７０によりフィルタして測定するスペクトラム
アナライザにおいて、入力減衰器５０によって減衰した
未知電力減衰信号５１を受けて、この信号を増幅し検波
して入力減衰器５０の出力端における未知電力レベルを
検出する手段を具備し、第１に上記未知電力検出手段で
得た電力レベル値が所定上限値より高い場合は入力減衰
器５０の減衰量を増加する方向に減衰レンジを設定制御
し、第２に上記未知電力検出手段で得た電力レベル値が
所定下限値より低い場合は入力減衰器５０の減衰量を減
少する方向に減衰レンジを設定制御する粗調整の手段を
具備し、上述で得た減衰レンジ及び前後の減衰レンジに
おいて、被測定信号１０１のパワー測定帯域を含む区間
を周波数変換部６０で周波数掃引して被測定信号１０１
の電力を各々測定算出し、この測定電力値から最適な減
衰レンジに設定制御する最適調整の手段を具備し、上記
減衰レンジの設定に連動して中間周波数の可変ゲインア
ンプ７２のゲインを制御して測定系全体のゲインを所定
の状態にゲイン制御する手段を具備する構成手段があ
る。上述粗調整と最適調整の手段により、広帯域に分布
した被測定周波数信号に対しても入力レベルの最適化を
実現可能としたスペクトラムアナライザが実現できる。FIG. 4 shows a solution according to the spectrum analyzer of the present invention. Secondly, in order to solve the above problem, in the configuration of the present invention, the unknown power attenuated signal 51 is received by the unknown power signal under measurement 101 and attenuated by the input attenuator 50. 60
To convert the frequency to a predetermined intermediate frequency IF1,
In a spectrum analyzer which is filtered and measured by a filter 70, an unknown power attenuated signal 51 attenuated by an input attenuator 50 is received, and this signal is amplified and detected to detect an unknown power level at an output terminal of the input attenuator 50. Firstly, when the power level value obtained by the unknown power detection means is higher than a predetermined upper limit value, the attenuation range is set and controlled in a direction to increase the amount of attenuation of the input attenuator 50; If the power level value obtained by the unknown power detection means is lower than a predetermined lower limit value, a coarse adjustment means for setting and controlling the attenuation range in a direction to decrease the attenuation of the input attenuator 50 is provided, and the attenuation range obtained above is provided. In the attenuation range before and after, the section including the power measurement band of the signal under test 101 is frequency-swept by the frequency conversion unit 60 and the signal under test 101
Of the variable gain amplifier 72 at the intermediate frequency in conjunction with the setting of the attenuation range. There is a configuration unit that includes a unit that controls the gain of the entire measurement system to a predetermined state. By means of the coarse adjustment and the optimal adjustment described above, a spectrum analyzer can be realized that can optimize the input level even for a frequency signal to be measured distributed over a wide band.
【００１０】第３図と第６図（ｂ）は、本発明の変調解
析装置に係る解決手段を示している。第３に、上記課題
を解決するために、本発明の構成では、未知電力の被測
定信号１０１を受けて、入力減衰器５０により減衰さ
せ、減衰した未知電力減衰信号５１を受けて周波数変換
部６０で所定の中間周波数ＩＦ１に周波数変換し、これ
をＩＦフィルタ７０によりフィルタし、変調解析部８０
に供給して変調解析を行う変調解析装置において、周波
数変換部６０は周波数を非掃引（ゼロスパンモード）と
し、変調解析部８０内の周波数変換部８２で更に低い第
２の中間周波数信号ＩＦ２に変換した信号を受けて、第
２の中間周波数信号ＩＦ２の３次高調波成分まで信号処
理可能な高速ＡＤ変換器９４を用いてデジタルデータに
変換して第２の中間周波数信号ＩＦ２の３次高調波成分
を測定する手段を具備し、前記３次高調波成分の測定手
段により上記入力減衰器５０の減衰レンジの減衰量を順
次変えて各々３次高調波成分を測定する手段を具備し、
前記で得た３次高調波成分の各減衰レンジ毎の値を受け
て、３次高調波成分が増加に転ずる減衰レンジを特定
し、これから入力減衰器５０の減衰レンジを最適レンジ
に設定する手段を具備し、上記最適レンジ設定に連動し
て中間周波数の可変ゲインアンプ７２のゲインを制御し
て測定系全体のゲインを所定の状態にゲイン制御する手
段を具備する構成手段がある。上述手法により、第２の
中間周波数信号ＩＦ２の３次高調波が増加に転ずる推移
が検出可能となる結果、広帯域に分布した被測定周波数
信号においても入力レベルの最適化を実現可能とした変
調解析装置が実現できる。FIG. 3 and FIG. 6 (b) show a solution according to the modulation analyzer of the present invention. Third, in order to solve the above-mentioned problem, in the configuration of the present invention, the frequency conversion unit receives the signal under measurement 101 of unknown power, attenuates it by the input attenuator 50, and receives the attenuated unknown power attenuated signal 51. At 60, the frequency is converted to a predetermined intermediate frequency IF1, which is filtered by an IF filter 70,
In the modulation analysis device that performs modulation analysis by supplying the signal to the frequency analysis unit 60, the frequency conversion unit 60 sets the frequency to non-sweep (zero span mode), and converts the frequency into a lower second intermediate frequency signal IF2 by the frequency conversion unit 82 in the modulation analysis unit 80 The received signal is converted into digital data using a high-speed AD converter 94 capable of processing up to the third harmonic component of the second intermediate frequency signal IF2, and the third harmonic of the second intermediate frequency signal IF2 is received. A means for measuring the component, and a means for measuring the third harmonic component by sequentially changing the attenuation of the attenuation range of the input attenuator 50 by the third harmonic component measuring means,
A means for determining the attenuation range in which the third harmonic component starts to increase based on the value of the third harmonic component obtained for each attenuation range obtained as described above, and setting the attenuation range of the input attenuator 50 to the optimum range from this. And a means for controlling the gain of the intermediate frequency variable gain amplifier 72 in conjunction with the above-mentioned optimum range setting to control the gain of the entire measurement system to a predetermined state. According to the above-described method, it is possible to detect a transition in which the third harmonic of the second intermediate frequency signal IF2 is turned into an increase, and as a result, it is possible to realize an input level optimization even for a measured frequency signal distributed over a wide band. The device can be realized.
【００１１】第８図は、本発明のスペクトラムアナライ
ザに係る解決手段を示している。第４に、上記課題を解
決するために、本発明の構成では、未知電力の被測定信
号１０１を受けて、入力減衰器５０により減衰させ、減
衰した未知電力減衰信号５１を受けて周波数変換部６０
で所定の中間周波数ＩＦ１に周波数変換し、これをＩＦ
フィルタ７０によりフィルタして測定するスペクトラム
アナライザにおいて、周波数変換部６０は周波数を非掃
引（ゼロスパンモード）とし、変調解析部８０内の周波
数変換部８２で更に低い第２の中間周波数信号ＩＦ２に
変換した信号を受けて、第２の中間周波数信号ＩＦ２の
３次高調波成分まで信号処理可能な高速ＡＤ変換器９４
を用いてデジタルデータに変換して第２の中間周波数信
号ＩＦ２の３次高調波成分を測定する手段を具備し、前
記３次高調波成分の測定手段により入力減衰器５０の減
衰レンジの減衰量を順次変えて３次高調波成分を各々測
定する手段を具備し、前記で得た３次高調波成分の各減
衰レンジ毎の値を受けて、３次高調波成分が増加に転ず
る減衰レンジを特定し、これから入力減衰器５０の減衰
レンジを最適レンジに設定する手段を具備し、上記最適
レンジ設定に連動して中間周波数の可変ゲインアンプ７
２のゲインを制御して測定系全体のゲインを所定の状態
にゲイン制御する手段を具備する構成手段がある。上述
手法により、第２の中間周波数信号ＩＦ２の３次高調波
が増加に転ずる推移が検出可能となる結果、広帯域に分
布した被測定周波数信号においても入力レベルの最適化
を実現可能としたスペクトラムアナライザが実現でき
る。FIG. 8 shows a solution according to the spectrum analyzer of the present invention. Fourth, in order to solve the above-described problem, in the configuration of the present invention, the frequency conversion unit receives the signal under measurement 101 of unknown power, attenuates it by the input attenuator 50, and receives the attenuated unknown power attenuated signal 51. 60
To convert the frequency to a predetermined intermediate frequency IF1,
In the spectrum analyzer that measures by filtering with the filter 70, the frequency conversion unit 60 sets the frequency to non-sweep (zero span mode), and converts the frequency to a lower second intermediate frequency signal IF2 by the frequency conversion unit 82 in the modulation analysis unit 80. High-speed AD converter 94 that can receive the signal and process the signal up to the third harmonic component of second intermediate frequency signal IF2
Means for measuring the third harmonic component of the second intermediate frequency signal IF2 by converting the data into digital data by using the third harmonic component. The amount of attenuation of the attenuation range of the input attenuator 50 is measured by the third harmonic component measuring means. Are sequentially changed to measure the third harmonic component, and the attenuation range in which the third harmonic component starts to increase in response to the value obtained for each attenuation range of the third harmonic component obtained above is provided. Means for specifying and setting the attenuation range of the input attenuator 50 to the optimum range from now on.
There is a configuration unit that includes a unit that controls the gain of No. 2 to control the gain of the entire measurement system to a predetermined state. According to the method described above, it is possible to detect a transition in which the third harmonic of the second intermediate frequency signal IF2 is turned into an increase, and as a result, it is possible to realize an input level optimization even for a frequency signal to be measured distributed over a wide band. Can be realized.
【００１２】[0012]
【発明の実施の形態】以下に本発明の実施の形態を実施
例と共に図面を参照して詳細に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings together with embodiments.
【００１３】（実施例１）本発明実施例について図１の
変調解析装置の構成図を示して説明する。尚、従来構成
に対応する要素は同一符号を付す。本発明では第１段階
では入力減衰器５０により減衰された未知電力減衰信号
５１を直接測定して減衰レンジを粗調整し、第２段階で
は被測定信号１０１のパワー測定帯域を含む周波数区間
を周波数変換部６０で周波数掃引して電力を測定し、こ
れに基づき最終的に入力減衰器５０を最適レンジに設定
制御する。(Embodiment 1) An embodiment of the present invention will be described with reference to the block diagram of the modulation analyzer shown in FIG. Elements corresponding to the conventional configuration are denoted by the same reference numerals. In the present invention, in the first stage, the unknown power attenuated signal 51 attenuated by the input attenuator 50 is directly measured to roughly adjust the attenuation range, and in the second stage, the frequency section including the power measurement band of the signal under test 101 is divided into frequencies. The frequency is swept by the converter 60 to measure the power, and based on this, the input attenuator 50 is finally set and controlled to the optimum range.
【００１４】構成は、図１に示すように従来構成要素に
対して、高周波増幅器２０と、検波部２５と、切替器８
６とを追加した構成で成る。第１段階の粗調整における
変調解析の測定に先立って、以下に説明する手段により
入力減衰器５０の減衰量設定の適正化を行う。このとき
切替器８６は検波部２５側に切替えておく。As shown in FIG. 1, a high frequency amplifier 20, a detector 25, a switch 8
6 is added. Prior to the measurement of the modulation analysis in the first stage of the coarse adjustment, the setting of the attenuation of the input attenuator 50 is optimized by means described below. At this time, the switch 86 is switched to the detection unit 25 side.
【００１５】高周波増幅器２０は、入力減衰器５０で減
衰されＬＰＦ（ローパスフィルタ）を通過した後の未知
電力減衰信号５１を受けて、所定倍率に増幅して出力す
る。検波部２５は、これを受けて検波し、検波した直流
電圧信号２６ｄｃを切替器８６を介してＡＤ変換器９０
に供給する。そしてＡＤ変換器９０によりデジタル変換
した未知電力データＤxを信号処理部９８へ供給する。The high-frequency amplifier 20 receives the unknown power attenuated signal 51 attenuated by the input attenuator 50 and passed through an LPF (low-pass filter), amplifies the signal by a predetermined factor, and outputs the amplified signal. The detection unit 25 receives this, detects it, and converts the detected DC voltage signal 26dc through the switch 86 into the AD converter 90.
To supply. Then, the unknown power data Dx digitally converted by the AD converter 90 is supplied to the signal processing unit 98.
【００１６】信号処理部９８では、前記未知電力データ
Ｄxを受けて、予め決めておいた上限レベルデータＤlmt
と比較して過大入力状態か否かを判定し、この判定結果
により入力減衰器５０の減衰レンジを適正値に切替え制
御する。尚、上記上限レベルデータＤlmtは、周波数変
換部６０のミキサ回路のばらつきを考慮し、裕度を持た
せた最大許容入力レベルを上限レベルデータＤlmtとす
るが、所望により個々の機器毎にミキサ回路の許容入力
レベルを各々求め、これを上限レベルデータＤlmtとし
て使用しても良い。In response to the unknown power data Dx, the signal processing section 98 determines the predetermined upper limit level data Dlmt.
Then, it is determined whether or not the input state is excessive, and the attenuation range of the input attenuator 50 is switched to an appropriate value based on the determination result. The upper limit level data Dlmt is set to the maximum allowable input level with allowance in consideration of the variation of the mixer circuit of the frequency conversion unit 60, and the upper limit level data Dlmt is used. May be obtained and used as the upper limit level data Dlmt.
【００１７】上記の減衰レンジの適正化制御において、
第１に、もし測定された未知電力データＤxの値が上限
レベルデータＤlmtより大きい場合には、過大入力レベ
ルであるから、入力減衰器５０の減衰量を増加する方向
に減衰レンジを切替え制御し、この切替えに連動して中
間周波数の可変ゲインアンプ７２のゲインを増加させ、
測定系全体のゲインを当初の所定増幅度となるように設
定制御する。第２に、もし未知電力データＤxの値が上
限レベルデータＤlmtから所定レベル（例えば１０ｄ
Ｂ）以上低い値の場合には、微少入力レベルであるか
ら、入力減衰器５０の減衰量を減少する方向に減衰レン
ジを切替え制御し、この切替えに連動して中間周波数の
可変ゲインアンプ７２のゲインを減少させ、測定系全体
のゲインを当初の所定増幅度となるように設定制御す
る。これにより未知電力減衰信号５１は適正化される。In the above-described control for optimizing the attenuation range,
First, if the measured value of the unknown power data Dx is larger than the upper limit level data Dlmt, it is an excessive input level, so that the attenuation range is switched and controlled so as to increase the attenuation of the input attenuator 50. In conjunction with this switching, the gain of the intermediate frequency variable gain amplifier 72 is increased,
The gain of the entire measurement system is set and controlled so as to become the initial predetermined amplification degree. Second, if the value of the unknown power data Dx is higher than the upper limit level data Dlmt by a predetermined level (for example, 10d
B) When the value is lower than this, since the input level is a minute input level, the attenuation range is switched and controlled in a direction in which the attenuation of the input attenuator 50 is reduced, and the intermediate frequency variable gain amplifier 72 is interlocked with this switching. The gain is reduced and the gain of the entire measurement system is set and controlled so as to be the initial predetermined amplification degree. As a result, the unknown power attenuation signal 51 is optimized.
【００１８】上述検波部２５のみの手段では必ずしも適
正ではない場合がある。この為測定装置の電力測定機能
を利用して第２段階の最適調整を行う。この第２段階の
最適調整は、測定対象とする信号の電力値を測定して最
適調整を実施する。即ち、被測定信号１０１のパワー測
定帯域を含む周波数区間を周波数変換部６０で周波数掃
引して電力を測定し、この電力測定を入力減衰器５０の
減衰レンジを上述第１段階の粗調整で得た減衰レンジの
設定状態から増減して減衰レンジを最適レンジに調整制
御する。There is a case where the above-described means using only the detection unit 25 is not always appropriate. For this reason, the second-stage optimal adjustment is performed using the power measuring function of the measuring device. In the second stage of the optimal adjustment, the optimal adjustment is performed by measuring the power value of the signal to be measured. That is, the frequency section including the power measurement band of the signal under test 101 is frequency-swept by the frequency conversion unit 60 to measure the power, and this power measurement is obtained by the above-described first-step coarse adjustment of the attenuation range of the input attenuator 50. The attenuation range is adjusted to the optimum range by increasing or decreasing from the setting state of the attenuation range.
【００１９】具体的には、図１０の周波数スペクトラム
からのパワー測定例に示すように、一般的なパワー測定
アプリケーションを用いてこの区間のパワーを積分して
電力を算出する。例えばスペクトラム表示画面上におい
て周波数軸を１１分割し、この分割中で、被測定信号１
０１の中心周波数ｆcを６／１１の位置にくるように測
定系の中心周波数を制御し、かつ４／１１〜８／１１区
間の位置に被測定信号１０１の帯域成分が収まるように
掃引スパンを自動制御する。そしてこの区間のパワーを
積分して電力を得る。この電力測定で得た結果から被測
定信号の電力が得られ、上述第１段階による減衰レンジ
をもとに該減衰レンジの設定に連動して中間周波数の可
変ゲインアンプのゲインを制御して測定系全体のゲイン
を所定の状態にすることで歪みを生じない減衰レンジに
最適制御可能となる。この結果、周波数変換歪みが無
く、Ｓ／Ｎが良く、測定精度の良い減衰レンジの自動制
御が可能となる利点が得られる。Specifically, as shown in an example of power measurement from the frequency spectrum in FIG. 10, power is calculated by integrating power in this section using a general power measurement application. For example, on the spectrum display screen, the frequency axis is divided into 11, and during this division, the signal under measurement 1
The center frequency of the measurement system is controlled so that the center frequency fc of 01 is at the position of 6/11, and the sweep span is adjusted so that the band component of the signal under measurement 101 falls within the position of 4/11 to 8/11. Control automatically. Then, the power in this section is integrated to obtain power. The power of the signal to be measured is obtained from the result obtained in the power measurement, and the gain of the intermediate frequency variable gain amplifier is controlled in accordance with the setting of the attenuation range based on the attenuation range in the first step. By setting the gain of the entire system to a predetermined state, it is possible to optimally control the attenuation range in which distortion does not occur. As a result, there is obtained an advantage that there is no frequency conversion distortion, the S / N is good, and the attenuation range with good measurement accuracy can be automatically controlled.
【００２０】上述適正化を実施の後、切替器８６を変調
解析側に切替えて本来の変調解析を実施する。尚、この
減衰量設定の適正化実施は、所望により変調解析測定の
合間、あるいは減衰量設定の適正化の実行を起動するキ
ー入力を受けた都度、あるいは随時実行するようにして
も良い。After the above optimization, the switch 86 is switched to the modulation analysis side to perform the original modulation analysis. The adjustment of the attenuation amount may be appropriately performed between the modulation analysis and the measurement, or whenever a key input for starting the execution of the adjustment of the attenuation amount is received, or as needed.
【００２１】上述発明の構成によれば、入力減衰器５０
により減衰された未知電力減衰信号５１を直接測定して
概略の減衰レンジを特定し、更にパワー測定アプリケー
ションを用いて被測定信号の電力を各々測定し、この結
果をもとに測定系全体のゲインを所定の状態にするた
め、周波数変換部６０のミキサ入力端は適正な入力レベ
ルに制御可能となるので、広帯域に分布した被測定周波
数信号においても入力レベルの適正化が的確容易に実現
できることとなる。従って、被測定信号が歪んで変調解
析の誤差要因や電力測定の誤差要因を生じる難点が解消
できる大きな利点が得られる。According to the configuration of the invention described above, the input attenuator 50
The unknown power attenuation signal 51 attenuated by the above is directly measured to specify the approximate attenuation range, and further, the power of the signal under measurement is measured using the power measurement application, and the gain of the entire measurement system is determined based on the result. To a predetermined state, the input terminal of the mixer of the frequency conversion unit 60 can be controlled to an appropriate input level, so that the input level can be appropriately and easily realized even in a frequency signal to be measured distributed over a wide band. Become. Accordingly, there is obtained a great advantage that a difficulty in which a signal to be measured is distorted and causes error factors in modulation analysis and error factors in power measurement can be eliminated.
【００２２】（実施例２）本発明実施例について図３の
変調解析装置の構成図を示して説明する。尚、従来構成
に対応する要素は同一符号を付す。本発明では周波数変
換部６０は周波数を非掃引（ゼロスパンモード）として
おき、中間周波数信号ＩＦ２の３次高調波成分まで信号
処理可能な高速ＡＤ変換器９４を用いてデジタルデータ
に変換して第２の中間周波数信号ＩＦ２の３次高調波成
分を検出測定することで、得られた前記３次高調波成分
が増加に転ずる減衰レンジを特定し、これから入力減衰
器５０を最適レンジに設定制御する手法である。(Embodiment 2) An embodiment of the present invention will be described with reference to the block diagram of the modulation analyzer shown in FIG. Elements corresponding to the conventional configuration are denoted by the same reference numerals. In the present invention, the frequency conversion section 60 sets the frequency to non-sweep (zero span mode), converts the frequency to digital data by using a high-speed AD converter 94 capable of processing up to the third harmonic component of the intermediate frequency signal IF2, and converts the data into the second data. A method of detecting and measuring the third harmonic component of the intermediate frequency signal IF2 to specify the attenuation range in which the obtained third harmonic component starts to increase, and to set and control the input attenuator 50 to the optimum range based on the attenuation range It is.
【００２３】構成は、図３に示すように従来構成要素に
対して、変調解析部８０内にＬＰＦ９２と、高速ＡＤ変
換器９４とを追加した構成で成る。The configuration is such that an LPF 92 and a high-speed A / D converter 94 are added in a modulation analyzer 80 to the conventional components as shown in FIG.
【００２４】実施例１と同様に、変調解析の測定に先立
って、以下に説明する手段により入力減衰器５０の減衰
量設定の適正化を行う。但し、予め被測定信号１０１の
変調解析対象となる基本周波数は得ておく。先ず周波数
変換部６０はゼロスパンモードとして周波数を非掃引に
する。この状態で周波数変換部８２が出力する中間周波
数信号ＩＦ２の基本波成分と３次高調波成分を測定す
る。例えば中間周波数信号ＩＦ２を２０ＭＨｚと仮定す
ると基本波成分は２０ＭＨｚで３次高調波成分は６０Ｍ
Ｈｚである。この３次高調波成分を含んだ交流信号を高
速ＡＤ変換器９４でデジタルデータに変換し、このデー
タをＦＦＴ処理して被測定信号１０１の基本波成分と３
次高調波成分の差を求める。この基本波成分と３次高調
波成分の差の測定処理を入力減衰器５０の減衰レンジを
順次切替えて実施する。これらの測定結果を、図６
（ｂ）の３次高調波レベルの推移例に示す。この推移図
ではポイント３０１が増加に転じ始めていることが判
る。この判定結果により、入力減衰器５０の最適設定す
べき減衰レンジはポイント３００として容易に求まる。
そしてこの減衰レンジの設定に連動して、実施例１と同
様に中間周波数の可変ゲインアンプ７２のゲインを増減
させて、測定系全体のゲインを当初の所定増幅度となる
ように設定制御することは言うまでもない。これにより
周波数変換部６０のミキサ回路への入力は最適な入力レ
ベルに設定制御される。As in the first embodiment, prior to the measurement of the modulation analysis, the attenuation setting of the input attenuator 50 is optimized by means described below. However, the fundamental frequency to be subjected to the modulation analysis of the signal under measurement 101 is obtained in advance. First, the frequency conversion unit 60 sets the frequency to non-sweep in the zero span mode. In this state, the fundamental component and the third harmonic component of the intermediate frequency signal IF2 output from the frequency converter 82 are measured. For example, assuming that the intermediate frequency signal IF2 is 20 MHz, the fundamental component is 20 MHz and the third harmonic component is 60 MHz.
Hz. The AC signal containing the third harmonic component is converted into digital data by the high-speed AD converter 94, and this data is subjected to FFT processing to obtain the fundamental wave component of the signal under measurement 101
Find the difference between the second harmonic components. The measurement process of the difference between the fundamental component and the third harmonic component is performed by sequentially switching the attenuation range of the input attenuator 50. These measurement results are shown in FIG.
The transition example of the third harmonic level in (b) is shown. In this transition diagram, it can be seen that the point 301 has started to increase. From this determination result, the attenuation range to be optimally set by the input attenuator 50 can be easily obtained as the point 300.
In conjunction with the setting of the attenuation range, the gain of the intermediate frequency variable gain amplifier 72 is increased or decreased in the same manner as in the first embodiment, and the gain of the entire measurement system is set and controlled so as to become the initial predetermined amplification. Needless to say. As a result, the input to the mixer circuit of the frequency conversion unit 60 is set and controlled to an optimum input level.
【００２５】上述発明の構成によれば、入力減衰器５０
の減衰レンジを順次変えて、被測定信号１０１を周波数
変換した中間周波数信号ＩＦ２の基本波成分と３次高調
波成分の差を求め、この基本波成分と３次高調波の差レ
ベルの推移が増加に転じる減衰レンジを特定すること
で、最適な減衰レンジが検出可能となる結果、被測定信
号が歪んで変調解析の誤差要因や電力測定の誤差要因を
生じる難点が解消できる大きな利点が得られる。According to the configuration of the invention described above, the input attenuator 50
, The difference between the fundamental wave component and the third harmonic component of the intermediate frequency signal IF2 obtained by frequency-converting the signal under test 101 is determined. By specifying the attenuation range that starts to increase, the optimal attenuation range can be detected, and as a result, a significant advantage is obtained in that the signal to be measured is distorted, which can cause errors in modulation analysis and error in power measurement. .
【００２６】尚、上述実施例１では、図１に示す変調解
析装置の具体構成例により、入力減衰器５０の出力端の
未知電力減衰信号５１のレベルを直接測定する構成例と
していたが、所望により図２に示すように、高周波増幅
器２０と検波部２５と切替器３０とによって未知電力減
衰信号５１のレベルを直接測定する構成としても良く、
同様にして実施可能である。In the first embodiment, the level of the unknown power attenuation signal 51 at the output terminal of the input attenuator 50 is directly measured by the specific configuration example of the modulation analyzer shown in FIG. 2, the level of the unknown power attenuated signal 51 may be directly measured by the high-frequency amplifier 20, the detector 25, and the switch 30, as shown in FIG.
It can be implemented in a similar manner.
【００２７】尚、上述実施例２では、図３に示す変調解
析装置の具体構成例により、３次高調波成分を測定する
構成例としていたが、所望により図９に示すように、中
間周波数信号における一次レベル信号のみを通過させる
ＢＰＦ（バンドパスフィルタ）を設けてフィルタし、こ
れを検波してレベルを測定し、更に中間周波数信号にお
ける三次レベル信号のみを通過させるＢＰＦ（バンドパ
スフィルタ）を設けてフィルタし、これを検波してレベ
ルを測定し、前記測定を減衰レンジを順次変えて一次レ
ベル信号と三次レベル信号の両者を求め、これから一次
と三次レベルとの差レベルが増加に転ずる減衰レンジが
特定できるので、同様にして入力減衰器５０の減衰レン
ジを適正化制御する構成手段としても良い。In the second embodiment described above, the third harmonic component is measured by the specific configuration example of the modulation analyzer shown in FIG. 3. However, if desired, as shown in FIG. A BPF (Band Pass Filter) that passes only the primary level signal is provided and filtered, the level is detected by detecting this, and a BPF (Band Pass Filter) that passes only the third level signal of the intermediate frequency signal is provided. The filter is then detected and the level is measured by detecting the same. The measurement is sequentially changed in the attenuation range to obtain both the primary level signal and the tertiary level signal, and from this the attenuation range in which the difference level between the primary and tertiary levels starts to increase Can be specified, and similarly, a configuration means for appropriately controlling the attenuation range of the input attenuator 50 may be used.
【００２８】尚、上述実施例１の説明では、変調解析装
置に適用した具体例で説明していたが、図４に示すよう
に、高周波増幅器２０と検波部２５と切替器３０を追加
したスペクトラムアナライザの構成とし、同様に入力減
衰器５０により減衰された未知電力減衰信号５１のレベ
ルを直接測定して減衰レンジを最適化制御することで、
同様にして入力レベルの最適化を実現可能であることは
明白である。In the above description of the first embodiment, a specific example applied to a modulation analyzer has been described. However, as shown in FIG. 4, a spectrum in which a high-frequency amplifier 20, a detector 25, and a switch 30 are added. The analyzer is configured so that the level of the unknown power attenuated signal 51 similarly attenuated by the input attenuator 50 is directly measured and the attenuation range is optimized and controlled.
It is clear that input level optimization can be achieved in a similar manner.
【００２９】尚、上述実施例２においても、変調解析装
置に適用した具体例で説明していたが、図８に示すよう
に、従来のスペクトラムアナライザの構成においても、
周波数変換部８２とＬＰＦ９２と高速ＡＤ変換器９４を
設けて、上述実施例２の手法である基本波成分と３次高
調波成分との差を順次測定し、得た基本波成分と３次高
調波成分との差から増加に転ずる減衰レンジを特定し
て、入力減衰器５０を適正化制御する手法を設けること
により実現可能である。In the second embodiment, a specific example applied to a modulation analyzer has been described. However, as shown in FIG. 8, even in the configuration of a conventional spectrum analyzer,
The frequency converter 82, the LPF 92, and the high-speed AD converter 94 are provided, and the difference between the fundamental wave component and the third harmonic component, which is the method of the second embodiment, is sequentially measured. This can be realized by providing a method of specifying an attenuation range that starts to increase based on the difference from the wave component and appropriately controlling the input attenuator 50.
【００３０】尚、上述実施例１では、図１あるいは図３
に示す変調解析装置の具体構成例で説明していたが、所
望により図７に示すように、両方の制御手段を併用する
構成としても良い。即ち、未知電力減衰信号５１を直接
測定し、この測定結果に基づき入力減衰器５０と中間周
波数の可変ゲインアンプ７２を適正に制御した後、更に
基本波成分と３次高調波を測定して基本波成分と３次高
調波との差が増加に転ずる推移を検出して、最適な入力
減衰器５０の設定に制御する両手法を併用する構成であ
る。In the first embodiment, FIG. 1 or FIG.
Has been described with reference to the specific configuration example of the modulation analyzer shown in FIG. 7, but if desired, as shown in FIG. That is, the unknown power attenuation signal 51 is directly measured, the input attenuator 50 and the intermediate frequency variable gain amplifier 72 are appropriately controlled based on the measurement result, and then the fundamental wave component and the third harmonic are measured. In this configuration, both the methods of detecting a transition in which the difference between the wave component and the third harmonic changes to increase and controlling the input attenuator 50 to the optimal setting are used in combination.
【００３１】[0031]
【発明の効果】本発明は、上述の説明内容から、下記に
記載される効果を奏する。第１に、上述実施例１の発明
構成によれば、入力減衰器５０により減衰された未知電
力減衰信号５１を直接測定して概略の減衰レンジを特定
し、更にパワー測定アプリケーションを用いて被測定信
号の電力を各々測定し、この結果をもとに測定系全体の
ゲインを所定の状態にすることで周波数変換部６０のミ
キサ入力端を適正な入力レベルに制御可能となるので、
広帯域に分布した被測定周波数信号においても入力レベ
ルの適正化が的確容易に実現できることとなる。従っ
て、被測定信号が歪んで変調解析の誤差要因や電力測定
の誤差要因を生じる難点が解消できる大きな利点が得ら
れる。また、スペクトラムアナライザの構成の場合も、
同様にして入力レベルの適正化の利点が得られる。According to the present invention, the following effects can be obtained from the above description. First, according to the configuration of the first embodiment, the unknown power attenuated signal 51 attenuated by the input attenuator 50 is directly measured to specify the approximate attenuation range, and the measured power is measured using the power measurement application. Since the power of the signal is measured and the gain of the entire measurement system is set to a predetermined state based on the result, the mixer input terminal of the frequency conversion unit 60 can be controlled to an appropriate input level.
The input level can be appropriately and easily adjusted even in the frequency signal to be measured distributed over a wide band. Accordingly, there is obtained a great advantage that a difficulty in which a signal to be measured is distorted and causes error factors in modulation analysis and error factors in power measurement can be eliminated. In the case of a spectrum analyzer configuration,
In the same manner, the advantage of optimizing the input level can be obtained.
【００３２】第２に、上述実施例２の発明構成によれ
ば、入力減衰器５０の減衰レンジを順次変えて、被測定
信号１０１を周波数変換した中間周波数信号ＩＦ２の基
本波成分と３次高調波成分との差を求め、この基本波成
分と３次高調波との差レベルの推移が増加に転じる減衰
レンジを特定することで、最適な減衰レンジが検出可能
となる結果、被測定信号が歪んで変調解析の誤差要因や
電力測定の誤差要因を生じる難点が解消できる大きな利
点が得られる。また、スペクトラムアナライザの構成の
場合も、同様にして入力レベルの適正化の利点が得られ
る。Secondly, according to the configuration of the second embodiment described above, the attenuation range of the input attenuator 50 is sequentially changed, and the fundamental wave component and the third harmonic of the intermediate frequency signal IF2 obtained by frequency-converting the signal under test 101 are obtained. The difference between the fundamental component and the third harmonic is determined and the attenuation range in which the transition of the difference level starts to increase can be determined. As a result, the optimum attenuation range can be detected. There is obtained a great advantage that it is possible to eliminate the difficulty that distortion causes modulation analysis error factors and power measurement error factors. Also, in the case of the configuration of the spectrum analyzer, the advantage of optimizing the input level can be obtained in the same manner.
【図１】 本発明の、変調解析装置の構成例である。FIG. 1 is a configuration example of a modulation analysis device according to the present invention.
【図２】 本発明の、変調解析装置の他の構成例であ
る。FIG. 2 is another configuration example of the modulation analyzer according to the present invention.
【図３】 本発明の、変調解析装置の他の構成例であ
る。FIG. 3 is another configuration example of the modulation analysis device according to the present invention.
【図４】 本発明の、スペクトラムアナライザの構成例
である。FIG. 4 is a configuration example of a spectrum analyzer of the present invention.
【図５】 従来の、変調解析装置の構成例である。FIG. 5 is a configuration example of a conventional modulation analyzer.
【図６】 広帯域に分布する周波数信号例と、基本波と
３次高調波との差のレベルの推移例である。FIG. 6 shows an example of a frequency signal distributed over a wide band and an example of transition of a difference level between a fundamental wave and a third harmonic.
【図７】 本発明の、変調解析装置の他の構成例であ
る。FIG. 7 is another configuration example of the modulation analysis device of the present invention.
【図８】 本発明の、スペクトラムアナライザの他の構
成例である。FIG. 8 is another configuration example of the spectrum analyzer of the present invention.
【図９】 本発明の、変調解析装置の他の構成例であ
る。FIG. 9 is another configuration example of the modulation analysis device of the present invention.
【図１０】 本発明の、周波数スペクトラムからのパワ
ー測定例である。FIG. 10 is an example of power measurement from a frequency spectrum according to the present invention.
２０ 高周波増幅器 ２５，７６ 検波部 ３０，８６ 切替器 ５０ 入力減衰器 ６０，８２ 周波数変換部 ７０ ＩＦフィルタ ７２，８４ 可変ゲインアンプ ７４ 対数変換部 ７８，９０ ＡＤ変換器 ８０ 変調解析部 ９４ 高速ＡＤ変換器 １４０ 表示装置 ９８ 信号処理部 １００ 被試験装置 １２０ 表示処理部 Reference Signs List 20 high-frequency amplifier 25, 76 detector 30, 86 switch 50 input attenuator 60, 82 frequency converter 70 IF filter 72, 84 variable gain amplifier 74 logarithmic converter 78, 90 AD converter 80 modulation analyzer 94 high-speed AD conversion Instrument 140 Display device 98 Signal processing unit 100 Device under test 120 Display processing unit
─────────────────────────────────────────────────────
────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成９年１０月６日[Submission date] October 6, 1997
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】全文[Correction target item name] Full text
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【書類名】 明細書[Document Name] Statement
【発明の名称】 変調解析装置及びスペクトラムアナラ
イザPatent application title: Modulation Analysis Apparatus and Spectrum Analyzer
【特許請求の範囲】[Claims]
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【発明の属する技術分野】この発明は、被測定周波数信
号の入力レベルの最適化に関する。特にスペクトラム拡
散された広帯域に分布する被測定周波数信号の入力レベ
ルの最適化に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to optimization of an input level of a frequency signal to be measured. In particular, the present invention relates to optimization of an input level of a frequency signal to be measured distributed over a wide band which is spread spectrum.
【０００２】[0002]
【従来の技術】従来技術例について図５の変調解析装置
の構成図を示して説明する。この変調解析装置は、スペ
クトラムアナライザを基本構成にし、この中間周波数信
号（ＩＦ信号）を受けて、被測定信号の各種変調に関わ
る解析機能を付加した構成例である。2. Description of the Related Art A prior art example will be described with reference to a block diagram of a modulation analyzer shown in FIG. This modulation analyzer has a spectrum analyzer as a basic configuration, receives this intermediate frequency signal (IF signal), and adds an analysis function relating to various types of modulation of a signal under measurement.
【０００３】構成は、被試験装置１００と、入力減衰器
５０と、周波数変換部６０と、ＩＦフィルタ７０と、可
変ゲインアンプ７２と、対数変換部７４と、検波部７６
と、ＡＤ変換器７８と、変調解析部８０と、表示処理部
１２０と、表示装置１４０とで成る。尚、スペクトラム
アナライザの構成は技術的に良く知られている為説明を
省略する。[0003] The configuration includes a device under test 100, an input attenuator 50, a frequency converter 60, an IF filter 70, a variable gain amplifier 72, a logarithmic converter 74, and a detector 76.
, An AD converter 78, a modulation analysis unit 80, a display processing unit 120, and a display device 140. Since the configuration of the spectrum analyzer is well known in the art, the description is omitted.
【０００４】変調解析部８０の内部構成は、周波数変換
部８２と、可変ゲインアンプ８４と、ＡＤ変換器９０
と、信号処理部９８とで成る。この変調解析部は、周波
数変換部８２により数ＭＨｚの低い中間周波数信号ＩＦ
２に変換し、可変ゲインアンプ８４でＡＤ変換器９０の
最適レベルに増幅した中間周波数信号をＡＤ変換器９０
で高速サンプリングし、信号処理して各種の変調特性等
の解析や変調精度に係る測定と演算処理をするものであ
る。処理された結果は表示処理部１２０を介して表示装
置１４０で所望の表示をする。[0004] The internal configuration of the modulation analysis section 80 is as follows: a frequency conversion section 82, a variable gain amplifier 84, an AD converter 90.
And a signal processing unit 98. This modulation analysis unit uses a frequency conversion unit 82 to output a low intermediate frequency signal IF of several MHz.
2 and the intermediate frequency signal amplified by the variable gain amplifier 84 to the optimum level of the AD converter 90
, Performs high-speed sampling, performs signal processing, analyzes various modulation characteristics and the like, and performs measurement and arithmetic processing relating to modulation accuracy. The processed result is displayed on the display device 140 via the display processing unit 120 as desired.
【０００５】ところで変調測定に際して表示装置１４０
の管面上の表示レベルを使用者が定める必要がある。こ
の管面レベルを設定する一手順を説明する。ここで被試
験装置１００が出力する被測定信号１０１は、図６
（ａ）に示す周波数信号２０１のように、ＣＤＭＡ（Co
de Division Multiple Access）等の広帯域に分布する
スペクトラム拡散された周波数信号の場合と仮定する。
先ず図６（ａ）に示す中心周波数ｆc付近に設定し、ゼ
ロスパン・モード（周波数を掃引しないモード）で入力
レベルを管面表示させる。そしてキー入力設定により、
スペクトラムレベルが大きく見易くなる所望の入力感度
及びリファレンスレベルに設定する。この設定の結果入
力減衰器５０とＩＦ信号用の可変ゲインアンプ７２は所
定の減衰量及び増幅量に自動設定される。尚、入力減衰
器５０は例えば１０ｄＢステップの減衰器であり、可変
ゲインアンプ７２は例えば０．１ｄＢ／Ｄiv．ステップ
の細かな可変増幅器である。[0005] By the way, at the time of modulation measurement, the display device 140
It is necessary for the user to determine the display level on the display screen. One procedure for setting the tube surface level will be described. The signal under test 101 output from the device under test 100 is shown in FIG.
As in the frequency signal 201 shown in FIG.
It is assumed that the signal is a spread-spectrum frequency signal distributed over a wide band such as de Division Multiple Access.
First, the input level is set near the center frequency fc shown in FIG. 6A, and the input level is displayed on the display panel in the zero span mode (mode in which the frequency is not swept). And by key input setting,
The desired input sensitivity and reference level are set so that the spectrum level is large and easy to see. As a result of this setting, the input attenuator 50 and the variable gain amplifier 72 for the IF signal are automatically set to predetermined attenuation and amplification amounts. The input attenuator 50 is, for example, an attenuator of 10 dB steps, and the variable gain amplifier 72 is, for example, 0.1 dB / Div. It is a variable amplifier with fine steps.
【０００６】[0006]
【発明が解決しようとする課題】ところで、図６（ａ）
に示すように、広帯域に分散した周波数信号２０１の
為、各周波数点でのレベルは低い。この為、上述管面表
示レベルの設定に伴って、入力減衰器５０の設定は小さ
い減衰量になっている。しかしながら広帯域に拡散した
全周波数の総電力は大きいレベルである。この結果、図
５に示す入力減衰器５０で減衰した未知電力減衰信号５
１は比較的大きなレベルである。この信号が周波数変換
部６０のミキサ回路の入力端に供給される。この結果、
ミキサ回路は過大な入力レベルとなる場合がある。もし
過大入力レベルの場合は、被測定周波数信号が歪んでＮ
次高調波を生じたり、周波数変換ゲインの直線性が大き
く変わる等の不具合を生じる。これら不具合は、被試験
装置の変調解析や電力測定の誤差を増長させる為、測定
装置としては好ましくなく、実用上の難点がある。尚、
図５に示す変調解析部８０を有しない一般的なスペクト
ラムアナライザにおいても広帯域に分布あるいは離散し
た未知電力の周波数信号等においては、同様の難点があ
ることは言うまでもない。FIG. 6 (a)
As shown in (1), the level at each frequency point is low because of the frequency signal 201 distributed over a wide band. Therefore, the setting of the input attenuator 50 is set to a small amount of attenuation in accordance with the setting of the above-described display surface level. However, the total power of all frequencies spread over a wide band is at a large level. As a result, the unknown power attenuated signal 5 attenuated by the input attenuator 50 shown in FIG.
1 is a relatively large level. This signal is supplied to the input terminal of the mixer circuit of the frequency conversion unit 60. As a result,
The mixer circuit may have an excessive input level. If the input level is excessive, the measured frequency signal is distorted and N
Inconveniences such as generation of second-order harmonics and significant change in linearity of frequency conversion gain occur. These disadvantages increase errors in modulation analysis and power measurement of the device under test, and therefore are not preferable as a measuring device and have practical problems. still,
It goes without saying that even a general spectrum analyzer having no modulation analysis unit 80 shown in FIG. 5 has the same disadvantages in frequency signals of unknown power distributed or dispersed over a wide band.
【０００７】そこで、本発明が解決しようとする課題
は、広帯域に分布あるいは離散した被測定周波数信号に
おいても入力レベルの最適化を実現可能とした変調解析
装置及びスペクトラムアナライザを提供することであ
る。It is an object of the present invention to provide a modulation analyzer and a spectrum analyzer which can realize an input level optimization even for a frequency signal to be measured distributed or dispersed over a wide band.
【０００８】[0008]
【課題を解決するための手段】第１図あるいは第２図と
第１０図は、本発明の変調解析装置に係る解決手段を示
している。第１に、上記課題を解決するために、本発明
の構成では、未知電力の被測定信号１０１を受けて、入
力減衰器５０により減衰させ、減衰した未知電力減衰信
号５１を受けて周波数変換部６０で所定の中間周波数Ｉ
Ｆ１に周波数変換し、これをＩＦフィルタ７０によりフ
ィルタし、変調解析部８０に供給して変調解析を行う変
調解析装置において、入力減衰器５０によって減衰した
未知電力減衰信号５１を受けて、この信号を増幅し検波
して入力減衰器５０の出力端における未知電力レベルを
検出する手段を具備し、第１に上記未知電力検出手段で
得た電力レベル値が所定上限値より高い場合は入力減衰
器５０の減衰量を増加する方向に減衰レンジを設定制御
し、第２に上記未知電力検出手段で得た電力レベル値が
所定下限値より低い場合は入力減衰器５０の減衰量を減
少する方向に減衰レンジを設定制御する粗調整の手段を
具備し、上述で得た減衰レンジ及び前後の減衰レンジに
おいて、被測定信号１０１のパワー測定帯域を含む区間
を周波数変換部６０で周波数掃引して被測定信号１０１
の電力を各々測定算出し、この測定電力値から最適な減
衰レンジに設定制御する最適調整の手段を具備し、上記
減衰レンジの設定に連動して中間周波数の可変ゲインア
ンプ７２のゲインを制御して測定系全体のゲインを所定
の状態にゲイン制御する手段を具備する構成手段であ
る。上述粗調整と最適調整の手段により、広帯域に分布
した被測定周波数信号に対しても入力レベルの最適化を
実現可能とした変調解析装置が実現できる。FIG. 1 or FIG. 2 and FIG. 10 show the means for solving the problems related to the modulation analyzer of the present invention. First, in order to solve the above-mentioned problem, in the configuration of the present invention, the frequency conversion unit receives the signal under measurement 101 of unknown power, attenuates it by the input attenuator 50, and receives the attenuated unknown power attenuation signal 51. 60 and a predetermined intermediate frequency I
F1 is frequency-converted, filtered by an IF filter 70, and supplied to a modulation analysis unit 80 to perform modulation analysis. The modulation analysis device receives the unknown power attenuated signal 51 attenuated by the input attenuator 50. Amplifying and detecting the unknown power level at the output terminal of the input attenuator 50. First, when the power level value obtained by the unknown power detecting means is higher than a predetermined upper limit, the input attenuator is detected. Second, the attenuation range is set and controlled in a direction to increase the attenuation amount of the input attenuator 50. If the power level value obtained by the unknown power detection means is lower than a predetermined lower limit value, the attenuation amount of the input attenuator 50 is reduced. A coarse adjustment means for setting and controlling the attenuation range is provided. In the attenuation range obtained above and before and after the attenuation range, the section including the power measurement band of the signal under test 101 is converted to the frequency conversion unit 6. In a frequency sweep to the signal to be measured 101
Of the variable gain amplifier 72 at the intermediate frequency in conjunction with the setting of the attenuation range. Means for controlling the gain of the entire measurement system to a predetermined state. By means of the coarse adjustment and the optimal adjustment described above, it is possible to realize a modulation analyzer capable of optimizing an input level even for a frequency signal to be measured distributed over a wide band.
【０００９】第４図は、本発明のスペクトラムアナライ
ザに係る解決手段を示している。第２に、上記課題を解
決するために、本発明の構成では、未知電力の被測定信
号１０１を受けて、入力減衰器５０により減衰させ、減
衰した未知電力減衰信号５１を受けて周波数変換部６０
で所定の中間周波数ＩＦ１に周波数変換し、これをＩＦ
フィルタ７０によりフィルタして測定するスペクトラム
アナライザにおいて、入力減衰器５０によって減衰した
未知電力減衰信号５１を受けて、この信号を増幅し検波
して入力減衰器５０の出力端における未知電力レベルを
検出する手段を具備し、第１に上記未知電力検出手段で
得た電力レベル値が所定上限値より高い場合は入力減衰
器５０の減衰量を増加する方向に減衰レンジを設定制御
し、第２に上記未知電力検出手段で得た電力レベル値が
所定下限値より低い場合は入力減衰器５０の減衰量を減
少する方向に減衰レンジを設定制御する粗調整の手段を
具備し、上述で得た減衰レンジ及び前後の減衰レンジに
おいて、被測定信号１０１のパワー測定帯域を含む区間
を周波数変換部６０で周波数掃引して被測定信号１０１
の電力を各々測定算出し、この測定電力値から最適な減
衰レンジに設定制御する最適調整の手段を具備し、上記
減衰レンジの設定に連動して中間周波数の可変ゲインア
ンプ７２のゲインを制御して測定系全体のゲインを所定
の状態にゲイン制御する手段を具備する構成手段であ
る。上述粗調整と最適調整の手段により、広帯域に分布
した被測定周波数信号に対しても入力レベルの最適化を
実現可能としたスペクトラムアナライザが実現できる。FIG. 4 shows a solution according to the spectrum analyzer of the present invention. Secondly, in order to solve the above problem, in the configuration of the present invention, the unknown power attenuated signal 51 is received by the unknown power signal under measurement 101 and attenuated by the input attenuator 50. 60
To convert the frequency to a predetermined intermediate frequency IF1,
In a spectrum analyzer which is filtered and measured by a filter 70, an unknown power attenuated signal 51 attenuated by an input attenuator 50 is received, and this signal is amplified and detected to detect an unknown power level at an output terminal of the input attenuator 50. Firstly, when the power level value obtained by the unknown power detection means is higher than a predetermined upper limit value, the attenuation range is set and controlled in a direction to increase the amount of attenuation of the input attenuator 50; If the power level value obtained by the unknown power detection means is lower than a predetermined lower limit value, a coarse adjustment means for setting and controlling the attenuation range in a direction to decrease the attenuation of the input attenuator 50 is provided, and the attenuation range obtained above is provided. In the attenuation range before and after, the section including the power measurement band of the signal under test 101 is frequency-swept by the frequency conversion unit 60 and the signal under test 101
Of the variable gain amplifier 72 at the intermediate frequency in conjunction with the setting of the attenuation range. Oh the gain of the entire measurement system Te configuration means comprises means for gain control in a predetermined state <br/> Ru. By means of the coarse adjustment and the optimal adjustment described above, a spectrum analyzer can be realized that can optimize the input level even for a frequency signal to be measured distributed over a wide band.
【００１０】第３図と第６図（ｂ）は、本発明の変調解
析装置に係る解決手段を示している。第３に、上記課題
を解決するために、本発明の構成では、未知電力の被測
定信号１０１を受けて、入力減衰器５０により減衰さ
せ、減衰した未知電力減衰信号５１を受けて周波数変換
部６０で所定の中間周波数ＩＦ１に周波数変換し、これ
をＩＦフィルタ７０によりフィルタし、変調解析部８０
に供給して変調解析を行う変調解析装置において、周波
数変換部６０は周波数を非掃引（ゼロスパンモード）と
し、変調解析部８０内の周波数変換部８２で更に低い第
２の中間周波数信号ＩＦ２に変換した信号を受けて、第
２の中間周波数信号ＩＦ２の３次高調波成分まで信号処
理可能な高速ＡＤ変換器９４を用いてデジタルデータに
変換して第２の中間周波数信号ＩＦ２の基本波成分と３
次高調波成分を測定する手段を具備し、前記３次高調波
成分の測定手段により上記入力減衰器５０の減衰レンジ
の減衰量を順次変えて各々基本波成分と３次高調波成分
を測定する手段を具備し、前記で得た３次高調波成分の
各減衰レンジ毎の値を受けて、３次高調波成分との差が
増加に転ずる減衰レンジを特定し、これから入力減衰器
５０の減衰レンジを最適レンジに設定する手段を具備
し、上記最適レンジ設定に連動して中間周波数の可変ゲ
インアンプ７２のゲインを制御して測定系全体のゲイン
を所定の状態にゲイン制御する手段を具備する構成手段
がある。上述手法により、第２の中間周波数信号ＩＦ２
の基本波成分と３次高調波成分との差が増加に転ずる推
移が検出可能となる結果、広帯域に分布した被測定周波
数信号においても入力レベルの最適化を実現可能とした
変調解析装置が実現できる。FIG. 3 and FIG. 6 (b) show a solution according to the modulation analyzer of the present invention. Third, in order to solve the above-mentioned problem, in the configuration of the present invention, the frequency conversion unit receives the signal under measurement 101 of unknown power, attenuates it by the input attenuator 50, and receives the attenuated unknown power attenuated signal 51. At 60, the frequency is converted to a predetermined intermediate frequency IF1, which is filtered by an IF filter 70,
In the modulation analysis device that performs modulation analysis by supplying the signal to the frequency analysis unit 60, the frequency conversion unit 60 sets the frequency to non-sweep (zero span mode), and converts the frequency into a lower second intermediate frequency signal IF2 by the frequency conversion unit 82 in the modulation analysis unit 80 The received signal is converted to digital data using a high-speed AD converter 94 capable of processing the signal up to the third harmonic component of the second intermediate frequency signal IF2, and the fundamental wave component of the second intermediate frequency signal IF2 and 3
Means for measuring the second harmonic component, wherein the fundamental harmonic component and the third harmonic component are measured by sequentially changing the attenuation of the attenuation range of the input attenuator 50 by the third harmonic component measuring means. Means for determining the attenuation range in which the difference from the third harmonic component starts to increase in response to the value obtained for each attenuation range of the third harmonic component obtained above. Means for setting the range to the optimum range; means for controlling the gain of the intermediate frequency variable gain amplifier 72 in conjunction with the setting of the optimum range to control the gain of the entire measurement system to a predetermined state. There are configuration means. According to the above method, the second intermediate frequency signal IF2
Can detect the transition of the difference between the fundamental component and the third harmonic component of the signal into an increase, resulting in a modulation analyzer that can optimize the input level even for the frequency signal to be measured distributed over a wide band. it can.
【００１１】第８図は、本発明のスペクトラムアナライ
ザに係る解決手段を示している。第４に、上記課題を解
決するために、本発明の構成では、未知電力の被測定信
号１０１を受けて、入力減衰器５０により減衰させ、減
衰した未知電力減衰信号５１を受けて周波数変換部６０
で所定の中間周波数ＩＦ１に周波数変換し、これをＩＦ
フィルタ７０によりフィルタして測定するスペクトラム
アナライザにおいて、周波数変換部６０は周波数を非掃
引（ゼロスパンモード）とし、変調解析部８０内の周波
数変換部８２で更に低い第２の中間周波数信号ＩＦ２に
変換した信号を受けて、第２の中間周波数信号ＩＦ２の
３次高調波成分まで信号処理可能な高速ＡＤ変換器９４
を用いてデジタルデータに変換して第２の中間周波数信
号ＩＦ２の基本波成分と３次高調波成分を測定する手段
を具備し、前記３次高調波成分の測定手段により入力減
衰器５０の減衰レンジの減衰量を順次変えて基本波成分
と３次高調波成分を各々測定する手段を具備し、前記で
得た３次高調波成分の各減衰レンジ毎の値を受けて、３
次高調波成分との差が増加に転ずる減衰レンジを特定
し、これから入力減衰器５０の減衰レンジを最適レンジ
に設定する手段を具備し、上記最適レンジ設定に連動し
て中間周波数の可変ゲインアンプ７２のゲインを制御し
て測定系全体のゲインを所定の状態にゲイン制御する手
段を具備する構成手段がある。上述手法により、第２の
中間周波数信号ＩＦ２の基本波成分と３次高調波成分と
の差が増加に転ずる推移が検出可能となる結果、広帯域
に分布した被測定周波数信号においても入力レベルの最
適化を実現可能としたスペクトラムアナライザが実現で
きる。FIG. 8 shows a solution according to the spectrum analyzer of the present invention. Fourth, in order to solve the above-described problem, in the configuration of the present invention, the frequency conversion unit receives the signal under measurement 101 of unknown power, attenuates it by the input attenuator 50, and receives the attenuated unknown power attenuated signal 51. 60
To convert the frequency to a predetermined intermediate frequency IF1,
In the spectrum analyzer that measures by filtering with the filter 70, the frequency conversion unit 60 sets the frequency to non-sweep (zero span mode), and converts the frequency to a lower second intermediate frequency signal IF2 by the frequency conversion unit 82 in the modulation analysis unit 80. High-speed AD converter 94 that can receive the signal and process the signal up to the third harmonic component of second intermediate frequency signal IF2
Means for measuring the fundamental wave component and the third harmonic component of the second intermediate frequency signal IF2 by converting the data into digital data by using the third harmonic component, and attenuating the input attenuator 50 by the third harmonic component measuring means. Fundamental wave component by sequentially changing the attenuation of the range
And means for measuring the third harmonic component, respectively, and receives the value of the third harmonic component obtained for each attenuation range, and
Means for specifying an attenuation range in which the difference with the next higher harmonic component is turned to increase, and setting the attenuation range of the input attenuator 50 to the optimum range from the specified attenuation range; There is a configuration unit that includes a unit that controls the gain of 72 and controls the gain of the entire measurement system to a predetermined state. The above method, the fundamental wave component of the second intermediate frequency signal IF2 and the third-order harmonic component
Results progression of difference in the starts to increase can be detected, a spectrum analyzer which enables realizing optimization of input level at the measured frequency signal distributed to a wide band can be realized.
【００１２】[0012]
【発明の実施の形態】以下に本発明の実施の形態を実施
例と共に図面を参照して詳細に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings together with embodiments.
【００１３】（実施例１）本発明実施例について図１の
変調解析装置の構成図を示して説明する。尚、従来構成
に対応する要素は同一符号を付す。本発明では第１段階
では入力減衰器５０により減衰された未知電力減衰信号
５１を直接測定して減衰レンジを粗調整し、第２段階で
は被測定信号１０１のパワー測定帯域を含む周波数区間
を周波数変換部６０で周波数掃引して電力を測定し、こ
れに基づき最終的に入力減衰器５０を最適レンジに設定
制御する。(Embodiment 1) An embodiment of the present invention will be described with reference to the block diagram of the modulation analyzer shown in FIG. Elements corresponding to the conventional configuration are denoted by the same reference numerals. In the present invention, in the first stage, the unknown power attenuated signal 51 attenuated by the input attenuator 50 is directly measured to roughly adjust the attenuation range, and in the second stage, the frequency section including the power measurement band of the signal under test 101 is divided into frequencies. The frequency is swept by the converter 60 to measure the power, and based on this, the input attenuator 50 is finally set and controlled to the optimum range.
【００１４】構成は、図１に示すように従来構成要素に
対して、高周波増幅器２０と、検波部２５と、切替器８
６とを追加した構成で成る。第１段階の粗調整における
変調解析の測定に先立って、以下に説明する手段により
入力減衰器５０の減衰量設定の適正化を行う。このとき
切替器８６は検波部２５側に切替えておく。As shown in FIG. 1, a high frequency amplifier 20, a detector 25, a switch 8
6 is added. Prior to the measurement of the modulation analysis in the first stage of the coarse adjustment, the setting of the attenuation of the input attenuator 50 is optimized by means described below. At this time, the switch 86 is switched to the detection unit 25 side.
【００１５】高周波増幅器２０は、入力減衰器５０で減
衰されＬＰＦ（ローパスフィルタ）を通過した後の未知
電力減衰信号５１を受けて、所定倍率に増幅して出力す
る。検波部２５は、これを受けて検波し、検波した直流
電圧信号２６ｄｃを切替器８６を介してＡＤ変換器９０
に供給する。そしてＡＤ変換器９０によりデジタル変換
した未知電力データＤxを信号処理部９８へ供給する。The high-frequency amplifier 20 receives the unknown power attenuated signal 51 attenuated by the input attenuator 50 and passed through an LPF (low-pass filter), amplifies the signal by a predetermined factor, and outputs the amplified signal. The detection unit 25 receives this, detects it, and converts the detected DC voltage signal 26dc through the switch 86 into the AD converter 90.
To supply. Then, the unknown power data Dx digitally converted by the AD converter 90 is supplied to the signal processing unit 98.
【００１６】信号処理部９８では、前記未知電力データ
Ｄxを受けて、予め決めておいた上限レベルデータＤlmt
と比較して過大入力状態か否かを判定し、この判定結果
により入力減衰器５０の減衰レンジを適正値に切替え制
御する。尚、上記上限レベルデータＤlmtは、周波数変
換部６０のミキサ回路のばらつきを考慮し、裕度を持た
せた最大許容入力レベルを上限レベルデータＤlmtとす
るが、所望により個々の機器毎にミキサ回路の許容入力
レベルを各々求め、これを上限レベルデータＤlmtとし
て使用しても良い。In response to the unknown power data Dx, the signal processing section 98 determines the predetermined upper limit level data Dlmt.
Then, it is determined whether or not the input state is excessive, and the attenuation range of the input attenuator 50 is switched to an appropriate value based on the determination result. The upper limit level data Dlmt is set to the maximum allowable input level with allowance in consideration of the variation of the mixer circuit of the frequency conversion unit 60, and the upper limit level data Dlmt is used. May be obtained and used as the upper limit level data Dlmt.
【００１７】上記の減衰レンジの適正化制御において、
第１に、もし測定された未知電力データＤxの値が上限
レベルデータＤlmtより大きい場合には、過大入力レベ
ルであるから、入力減衰器５０の減衰量を増加する方向
に減衰レンジを切替え制御し、この切替えに連動して中
間周波数の可変ゲインアンプ７２のゲインを増加させ、
測定系全体のゲインを当初の所定増幅度となるように設
定制御する。第２に、もし未知電力データＤxの値が上
限レベルデータＤlmtから所定レベル（例えば１０ｄ
Ｂ）以上低い値の場合には、微少入力レベルであるか
ら、入力減衰器５０の減衰量を減少する方向に減衰レン
ジを切替え制御し、この切替えに連動して中間周波数の
可変ゲインアンプ７２のゲインを減少させ、測定系全体
のゲインを当初の所定増幅度となるように設定制御す
る。これにより未知電力減衰信号５１は適正化される。In the above-described control for optimizing the attenuation range,
First, if the measured value of the unknown power data Dx is larger than the upper limit level data Dlmt, it is an excessive input level, so that the attenuation range is switched and controlled so as to increase the attenuation of the input attenuator 50. In conjunction with this switching, the gain of the intermediate frequency variable gain amplifier 72 is increased,
The gain of the entire measurement system is set and controlled so as to become the initial predetermined amplification degree. Second, if the value of the unknown power data Dx is higher than the upper limit level data Dlmt by a predetermined level (for example, 10d
B) When the value is lower than this, since the input level is a minute input level, the attenuation range is switched and controlled in a direction in which the attenuation of the input attenuator 50 is reduced, and the intermediate frequency variable gain amplifier 72 is interlocked with this switching. The gain is reduced and the gain of the entire measurement system is set and controlled so as to be the initial predetermined amplification degree. As a result, the unknown power attenuation signal 51 is optimized.
【００１８】上述検波部２５のみの手段では必ずしも適
正ではない場合がある。この為測定装置の電力測定機能
を利用して第２段階の最適調整を行う。この第２段階の
最適調整は、測定対象とする信号の電力値を測定して最
適調整を実施する。即ち、被測定信号１０１のパワー測
定帯域を含む周波数区間を周波数変換部６０で周波数掃
引して電力を測定し、この電力測定を入力減衰器５０の
減衰レンジを上述第１段階の粗調整で得た減衰レンジの
設定状態から増減して減衰レンジを最適レンジに調整制
御する。There is a case where the above-described means using only the detection unit 25 is not always appropriate. For this reason, the second-stage optimal adjustment is performed using the power measuring function of the measuring device. In the second stage of the optimal adjustment, the optimal adjustment is performed by measuring the power value of the signal to be measured. That is, the frequency section including the power measurement band of the signal under test 101 is frequency-swept by the frequency conversion unit 60 to measure the power, and this power measurement is obtained by the above-described first-step coarse adjustment of the attenuation range of the input attenuator 50. The attenuation range is adjusted to the optimum range by increasing or decreasing from the setting state of the attenuation range.
【００１９】具体的には、図１０の周波数スペクトラム
からのパワー測定例に示すように、一般的なパワー測定
アプリケーションを用いてこの区間のパワーを積分して
電力を算出する。例えばスペクトラム表示画面上におい
て周波数軸を１０分割し、この分割中で、被測定信号１
０１の中心周波数ｆcを５／１０の位置にくるように測
定系の中心周波数を制御し、かつ２／１０〜８／１０区
間の位置に被測定信号１０１の帯域成分が収まるように
掃引スパンを自動制御する。そしてこの区間のパワーを
積分して電力を得る。この電力測定で得た結果から被測
定信号の電力が得られ、上述第１段階による減衰レンジ
をもとに該減衰レンジの設定に連動して中間周波数の可
変ゲインアンプのゲインを制御して測定系全体のゲイン
を所定の状態にすることで歪みを生じない減衰レンジに
最適制御可能となる。この結果、周波数変換歪みが無
く、Ｓ／Ｎが良く、測定精度の良い減衰レンジの自動制
御が可能となる利点が得られる。Specifically, as shown in an example of power measurement from the frequency spectrum in FIG. 10, power is calculated by integrating power in this section using a general power measurement application. For example the frequency axis 1 0 divide the spectrum display screen, in this division, signal 1 to be measured
01 the center frequency fc to control the center frequency of the measurement system to come to a position of 5/10, and 2/10 to 8/1 0 sweep span as band component of the measured signal 101 falls to the position of the section of the Automatic control. Then, the power in this section is integrated to obtain power. The power of the signal to be measured is obtained from the result obtained in the power measurement, and the gain of the intermediate frequency variable gain amplifier is controlled in accordance with the setting of the attenuation range based on the attenuation range in the first step. By setting the gain of the entire system to a predetermined state, it is possible to optimally control the attenuation range in which distortion does not occur. As a result, there is obtained an advantage that there is no frequency conversion distortion, the S / N is good, and the attenuation range with good measurement accuracy can be automatically controlled.
【００２０】上述適正化を実施の後、切替器８６を変調
解析側に切替えて本来の変調解析を実施する。尚、この
減衰量設定の適正化実施は、所望により変調解析測定の
合間、あるいは減衰量設定の適正化の実行を起動するキ
ー入力を受けた都度、あるいは随時実行するようにして
も良い。After the above optimization, the switch 86 is switched to the modulation analysis side to perform the original modulation analysis. The adjustment of the attenuation amount may be appropriately performed between the modulation analysis and the measurement, or whenever a key input for starting the execution of the adjustment of the attenuation amount is received, or as needed.
【００２１】上述発明の構成によれば、入力減衰器５０
により減衰された未知電力減衰信号５１を直接測定して
概略の減衰レンジを特定し、更にパワー測定アプリケー
ションを用いて被測定信号の電力を各々測定し、この結
果をもとに測定系全体のゲインを所定の状態にするた
め、周波数変換部６０のミキサ入力端は適正な入力レベ
ルに制御可能となるので、広帯域に分布した被測定周波
数信号においても入力レベルの適正化が的確容易に実現
できることとなる。従って、被測定信号が歪んで変調解
析の誤差要因や電力測定の誤差要因を生じる難点が解消
できる大きな利点が得られる。According to the configuration of the invention described above, the input attenuator 50
The unknown power attenuation signal 51 attenuated by the above is directly measured to specify the approximate attenuation range, and further, the power of the signal under measurement is measured using the power measurement application, and the gain of the entire measurement system is determined based on the result. To a predetermined state, the input terminal of the mixer of the frequency conversion unit 60 can be controlled to an appropriate input level, so that the input level can be appropriately and easily realized even in a frequency signal to be measured distributed over a wide band. Become. Accordingly, there is obtained a great advantage that a difficulty in which a signal to be measured is distorted and causes error factors in modulation analysis and error factors in power measurement can be eliminated.
【００２２】（実施例２）本発明実施例について図３の
変調解析装置の構成図を示して説明する。尚、従来構成
に対応する要素は同一符号を付す。本発明では周波数変
換部６０は周波数を非掃引（ゼロスパンモード）として
おき、中間周波数信号ＩＦ２の３次高調波成分まで信号
処理可能な高速ＡＤ変換器９４を用いてデジタルデータ
に変換して第２の中間周波数信号ＩＦ２の基本波成分と
３次高調波成分との差を検出測定することで、得られた
前記基本波成分と３次高調波成分との差が増加に転ずる
減衰レンジを特定し、これから入力減衰器５０を最適レ
ンジに設定制御する手法である。(Embodiment 2) An embodiment of the present invention will be described with reference to the block diagram of the modulation analyzer shown in FIG. Elements corresponding to the conventional configuration are denoted by the same reference numerals. In the present invention, the frequency conversion section 60 sets the frequency to non-sweep (zero span mode), converts the frequency to digital data by using a high-speed AD converter 94 capable of processing up to the third harmonic component of the intermediate frequency signal IF2, and converts the data into the second data. By detecting and measuring the difference between the fundamental component and the third harmonic component of the intermediate frequency signal IF2, the attenuation range in which the obtained difference between the fundamental component and the third harmonic component starts to increase is specified. This is a method for setting and controlling the input attenuator 50 to the optimum range.
【００２３】構成は、図３に示すように従来構成要素に
対して、変調解析部８０内にＬＰＦ９２と、高速ＡＤ変
換器９４とを追加した構成で成る。The configuration is such that an LPF 92 and a high-speed A / D converter 94 are added in a modulation analyzer 80 to the conventional components as shown in FIG.
【００２４】実施例１と同様に、変調解析の測定に先立
って、以下に説明する手段により入力減衰器５０の減衰
量設定の適正化を行う。但し、予め被測定信号１０１の
変調解析対象となる基本周波数は得ておく。先ず周波数
変換部６０はゼロスパンモードとして周波数を非掃引に
する。この状態で周波数変換部８２が出力する中間周波
数信号ＩＦ２の基本波成分と３次高調波成分を測定す
る。例えば中間周波数信号ＩＦ２を２０ＭＨｚと仮定す
ると基本波成分は２０ＭＨｚで３次高調波成分は６０Ｍ
Ｈｚである。この３次高調波成分を含んだ交流信号を高
速ＡＤ変換器９４でデジタルデータに変換し、このデー
タをＦＦＴ処理して被測定信号１０１の基本波成分と３
次高調波成分の差を求める。この基本波成分と３次高調
波成分の差の測定処理を入力減衰器５０の減衰レンジを
順次切替えて実施する。これらの測定結果を、図６
（ｂ）の３次高調波レベルの推移例に示す。この推移図
ではポイント３０１が増加に転じ始めていることが判
る。この判定結果により、入力減衰器５０の最適設定す
べき減衰レンジはポイント３００として容易に求まる。
そしてこの減衰レンジの設定に連動して、実施例１と同
様に中間周波数の可変ゲインアンプ７２のゲインを増減
させて、測定系全体のゲインを当初の所定増幅度となる
ように設定制御することは言うまでもない。これにより
周波数変換部６０のミキサ回路への入力は最適な入力レ
ベルに設定制御される。As in the first embodiment, prior to the measurement of the modulation analysis, the attenuation setting of the input attenuator 50 is optimized by means described below. However, the fundamental frequency to be subjected to the modulation analysis of the signal under measurement 101 is obtained in advance. First, the frequency conversion unit 60 sets the frequency to non-sweep in the zero span mode. In this state, the fundamental component and the third harmonic component of the intermediate frequency signal IF2 output from the frequency converter 82 are measured. For example, assuming that the intermediate frequency signal IF2 is 20 MHz, the fundamental component is 20 MHz and the third harmonic component is 60 MHz.
Hz. The AC signal containing the third harmonic component is converted into digital data by the high-speed AD converter 94, and this data is subjected to FFT processing to obtain the fundamental wave component of the signal under measurement 101
Find the difference between the second harmonic components. The measurement process of the difference between the fundamental component and the third harmonic component is performed by sequentially switching the attenuation range of the input attenuator 50. These measurement results are shown in FIG.
The transition example of the third harmonic level in (b) is shown. In this transition diagram, it can be seen that the point 301 has started to increase. From this determination result, the attenuation range to be optimally set by the input attenuator 50 can be easily obtained as the point 300.
In conjunction with the setting of the attenuation range, the gain of the intermediate frequency variable gain amplifier 72 is increased or decreased in the same manner as in the first embodiment, and the gain of the entire measurement system is set and controlled so as to become the initial predetermined amplification. Needless to say. As a result, the input to the mixer circuit of the frequency conversion unit 60 is set and controlled to an optimum input level.
【００２５】上述発明の構成によれば、入力減衰器５０
の減衰レンジを順次変えて、被測定信号１０１を周波数
変換した中間周波数信号ＩＦ２の基本波成分と３次高調
波成分の差を求め、この基本波成分と３次高調波の差レ
ベルの推移が増加に転じる減衰レンジを特定すること
で、最適な減衰レンジが検出可能となる結果、被測定信
号が歪んで変調解析の誤差要因や電力測定の誤差要因を
生じる難点が解消できる大きな利点が得られる。According to the configuration of the invention described above, the input attenuator 50
, The difference between the fundamental wave component and the third harmonic component of the intermediate frequency signal IF2 obtained by frequency-converting the signal under test 101 is determined. By specifying the attenuation range that starts to increase, the optimal attenuation range can be detected, and as a result, a significant advantage is obtained in that the signal to be measured is distorted, which can cause errors in modulation analysis and error in power measurement. .
【００２６】尚、上述実施例１では、図１に示す変調解
析装置の具体構成例により、入力減衰器５０の出力端の
未知電力減衰信号５１のレベルを直接測定する構成例と
していたが、所望により図２に示すように、高周波増幅
器２０と検波部２５と切替器３０とによって未知電力減
衰信号５１のレベルを直接測定する構成としても良く、
同様にして実施可能である。In the first embodiment, the level of the unknown power attenuation signal 51 at the output terminal of the input attenuator 50 is directly measured by the specific configuration example of the modulation analyzer shown in FIG. 2, the level of the unknown power attenuated signal 51 may be directly measured by the high-frequency amplifier 20, the detector 25, and the switch 30, as shown in FIG.
It can be implemented in a similar manner.
【００２７】尚、上述実施例２では、図３に示す変調解
析装置の具体構成例により、３次高調波成分を測定する
構成例としていたが、所望により図９に示すように、中
間周波数信号における一次レベル信号のみを通過させる
ＢＰＦ（バンドパスフィルタ）を設けてフィルタし、こ
れを検波してレベルを測定し、更に中間周波数信号にお
ける三次レベル信号のみを通過させるＢＰＦ（バンドパ
スフィルタ）を設けてフィルタし、これを検波してレベ
ルを測定し、前記測定を減衰レンジを順次変えて一次レ
ベル信号と三次レベル信号の両者を求め、これから一次
と三次レベルとの差レベルが増加に転ずる減衰レンジが
特定できるので、同様にして入力減衰器５０の減衰レン
ジを適正化制御する構成手段としても良い。In the second embodiment described above, the third harmonic component is measured by the specific configuration example of the modulation analyzer shown in FIG. 3. However, if desired, as shown in FIG. A BPF (Band Pass Filter) that passes only the primary level signal is provided and filtered, the level is detected by detecting this, and a BPF (Band Pass Filter) that passes only the third level signal of the intermediate frequency signal is provided. The filter is then detected and the level is measured by detecting the same. The measurement is sequentially changed in the attenuation range to obtain both the primary level signal and the tertiary level signal, and from this the attenuation range in which the difference level between the primary and tertiary levels starts to increase Can be specified, and similarly, a configuration means for appropriately controlling the attenuation range of the input attenuator 50 may be used.
【００２８】尚、上述実施例１の説明では、変調解析装
置に適用した具体例で説明していたが、図４に示すよう
に、高周波増幅器２０と検波部２５と切替器３０を追加
したスペクトラムアナライザの構成とし、同様に入力減
衰器５０により減衰された未知電力減衰信号５１のレベ
ルを直接測定して減衰レンジを最適化制御することで、
同様にして入力レベルの最適化を実現可能であることは
明白である。In the above description of the first embodiment, a specific example applied to a modulation analyzer has been described. However, as shown in FIG. 4, a spectrum in which a high-frequency amplifier 20, a detector 25, and a switch 30 are added. The analyzer is configured so that the level of the unknown power attenuated signal 51 similarly attenuated by the input attenuator 50 is directly measured and the attenuation range is optimized and controlled.
It is clear that input level optimization can be achieved in a similar manner.
【００２９】尚、上述実施例２においても、変調解析装
置に適用した具体例で説明していたが、図８に示すよう
に、従来のスペクトラムアナライザの構成においても、
周波数変換部８２とＬＰＦ９２と高速ＡＤ変換器９４を
設けて、上述実施例２の手法である基本波成分と３次高
調波成分との差を順次測定し、得た基本波成分と３次高
調波成分との差から増加に転ずる減衰レンジを特定し
て、入力減衰器５０を適正化制御する手法を設けること
により実現可能である。In the second embodiment, a specific example applied to a modulation analyzer has been described. However, as shown in FIG. 8, even in the configuration of a conventional spectrum analyzer,
The frequency converter 82, the LPF 92, and the high-speed AD converter 94 are provided, and the difference between the fundamental wave component and the third harmonic component, which is the method of the second embodiment, is sequentially measured. This can be realized by providing a method of specifying an attenuation range that starts to increase based on the difference from the wave component and appropriately controlling the input attenuator 50.
【００３０】尚、上述実施例１では、図１あるいは図３
に示す変調解析装置の具体構成例で説明していたが、所
望により図７に示すように、両方の制御手段を併用する
構成としても良い。即ち、未知電力減衰信号５１を直接
測定し、この測定結果に基づき入力減衰器５０と中間周
波数の可変ゲインアンプ７２を適正に制御した後、更に
基本波成分と３次高調波を測定して基本波成分と３次高
調波との差が増加に転ずる推移を検出して、最適な入力
減衰器５０の設定に制御する両手法を併用する構成であ
る。In the first embodiment, FIG. 1 or FIG.
Has been described with reference to the specific configuration example of the modulation analyzer shown in FIG. 7, but if desired, as shown in FIG. That is, the unknown power attenuation signal 51 is directly measured, the input attenuator 50 and the intermediate frequency variable gain amplifier 72 are appropriately controlled based on the measurement result, and then the fundamental wave component and the third harmonic are measured. In this configuration, both the methods of detecting a transition in which the difference between the wave component and the third harmonic changes to increase and controlling the input attenuator 50 to the optimal setting are used in combination.
【００３１】[0031]
【発明の効果】本発明は、上述の説明内容から、下記に
記載される効果を奏する。第１に、上述実施例１の発明
構成によれば、入力減衰器５０により減衰された未知電
力減衰信号５１を直接測定して概略の減衰レンジを特定
し、更にパワー測定アプリケーションを用いて被測定信
号の電力を各々測定し、この結果をもとに測定系全体の
ゲインを所定の状態にすることで周波数変換部６０のミ
キサ入力端を適正な入力レベルに制御可能となるので、
広帯域に分布した被測定周波数信号においても入力レベ
ルの適正化が的確容易に実現できることとなる。従っ
て、被測定信号が歪んで変調解析の誤差要因や電力測定
の誤差要因を生じる難点が解消できる大きな利点が得ら
れる。また、スペクトラムアナライザの構成の場合も、
同様にして入力レベルの適正化の利点が得られる。According to the present invention, the following effects can be obtained from the above description. First, according to the configuration of the first embodiment, the unknown power attenuated signal 51 attenuated by the input attenuator 50 is directly measured to specify the approximate attenuation range, and the measured power is measured using the power measurement application. Since the power of the signal is measured and the gain of the entire measurement system is set to a predetermined state based on the result, the mixer input terminal of the frequency conversion unit 60 can be controlled to an appropriate input level.
The input level can be appropriately and easily adjusted even in the frequency signal to be measured distributed over a wide band. Accordingly, there is obtained a great advantage that a difficulty in which a signal to be measured is distorted and causes error factors in modulation analysis and error factors in power measurement can be eliminated. In the case of a spectrum analyzer configuration,
In the same manner, the advantage of optimizing the input level can be obtained.
【００３２】第２に、上述実施例２の発明構成によれ
ば、入力減衰器５０の減衰レンジを順次変えて、被測定
信号１０１を周波数変換した中間周波数信号ＩＦ２の基
本波成分と３次高調波成分との差を求め、この基本波成
分と３次高調波との差レベルの推移が増加に転じる減衰
レンジを特定することで、最適な減衰レンジが検出可能
となる結果、被測定信号が歪んで変調解析の誤差要因や
電力測定の誤差要因を生じる難点が解消できる大きな利
点が得られる。また、スペクトラムアナライザの構成の
場合も、同様にして入力レベルの適正化の利点が得られ
る。Secondly, according to the configuration of the second embodiment described above, the attenuation range of the input attenuator 50 is sequentially changed, and the fundamental wave component and the third harmonic of the intermediate frequency signal IF2 obtained by frequency-converting the signal under test 101 are obtained. The difference between the fundamental component and the third harmonic is determined and the attenuation range in which the transition of the difference level starts to increase can be determined. As a result, the optimum attenuation range can be detected. There is obtained a great advantage that it is possible to eliminate the difficulty that distortion causes modulation analysis error factors and power measurement error factors. Also, in the case of the configuration of the spectrum analyzer, the advantage of optimizing the input level can be obtained in the same manner.
【図面の簡単な説明】[Brief description of the drawings]
【図１】 本発明の、変調解析装置の構成例である。FIG. 1 is a configuration example of a modulation analysis device according to the present invention.
【図２】 本発明の、変調解析装置の他の構成例であ
る。FIG. 2 is another configuration example of the modulation analyzer according to the present invention.
【図３】 本発明の、変調解析装置の他の構成例であ
る。FIG. 3 is another configuration example of the modulation analysis device according to the present invention.
【図４】 本発明の、スペクトラムアナライザの構成例
である。FIG. 4 is a configuration example of a spectrum analyzer of the present invention.
【図５】 従来の、変調解析装置の構成例である。FIG. 5 is a configuration example of a conventional modulation analyzer.
【図６】 広帯域に分布する周波数信号例と、基本波と
３次高調波との差のレベルの推移例である。FIG. 6 shows an example of a frequency signal distributed over a wide band and an example of transition of a difference level between a fundamental wave and a third harmonic.
【図７】 本発明の、変調解析装置の他の構成例であ
る。FIG. 7 is another configuration example of the modulation analysis device of the present invention.
【図８】 本発明の、スペクトラムアナライザの他の構
成例である。FIG. 8 is another configuration example of the spectrum analyzer of the present invention.
【図９】 本発明の、変調解析装置の他の構成例であ
る。FIG. 9 is another configuration example of the modulation analysis device of the present invention.
【図１０】 本発明の、周波数スペクトラムからのパワ
ー測定例である。FIG. 10 is an example of power measurement from a frequency spectrum according to the present invention.
【符号の説明】 ２０ 高周波増幅器 ２５，７６ 検波部 ３０，８６ 切替器 ５０ 入力減衰器 ６０，８２ 周波数変換部 ７０ ＩＦフィルタ ７２，８４ 可変ゲインアンプ ７４ 対数変換部 ７８，９０ ＡＤ変換器 ８０ 変調解析部 ９４ 高速ＡＤ変換器 １４０ 表示装置 ９８ 信号処理部 １００ 被試験装置 １２０ 表示処理部[Description of Signs] 20 High frequency amplifier 25, 76 Detector 30, 86 Switcher 50 Input attenuator 60, 82 Frequency converter 70 IF filter 72, 84 Variable gain amplifier 74 Logarithmic converter 78, 90 AD converter 80 Modulation analysis Unit 94 high-speed AD converter 140 display device 98 signal processing unit 100 device under test 120 display processing unit
【手続補正２】[Procedure amendment 2]
【補正対象書類名】図面[Document name to be amended] Drawing
【補正対象項目名】図１０[Correction target item name] FIG.
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【図１０】 FIG. 10
Claims (4)
衰器により減衰させ、減衰した未知電力減衰信号を受け
て周波数変換部で所定の中間周波数に周波数変換し、こ
れをＩＦフィルタによりフィルタし、変調解析部に供給
して変調解析を行う変調解析装置において、 該入力減衰器によって減衰した未知電力減衰信号を受け
て、該信号を増幅し検波して該入力減衰器の出力端にお
ける未知電力レベルを検出する手段と、 第１に該未知電力検出手段で得た電力レベル値が所定上
限値より高い場合は該入力減衰器の減衰量を増加する方
向に減衰レンジを設定制御し、第２に該未知電力検出手
段で得た電力レベル値が所定下限値より低い場合は該入
力減衰器の減衰量を減少する方向に減衰レンジを設定制
御する手段と、 上述で得た減衰レンジ及び前後の減衰レンジにおいて、
被測定信号のパワー測定帯域を含む区間を周波数変換部
で周波数掃引して被測定信号の電力を各々測定算出し、
この測定電力値をもとに最適な減衰レンジに設定制御す
る手段と、 該減衰レンジの設定に連動して中間周波数の可変ゲイン
アンプのゲインを制御して測定系全体のゲインを所定の
状態にゲイン制御する手段と、 以上を具備していることを特徴とした変調解析装置。An unknown power attenuated signal is received and attenuated by an input attenuator. The attenuated unknown power attenuated signal is received and frequency-converted to a predetermined intermediate frequency by a frequency conversion unit. A modulation analysis device that supplies the signal to a modulation analysis unit to perform modulation analysis, receives the unknown power attenuated signal attenuated by the input attenuator, amplifies and detects the signal, and detects an unknown power at an output terminal of the input attenuator. Means for detecting a power level; first, when the power level value obtained by the unknown power detecting means is higher than a predetermined upper limit value, setting and controlling an attenuation range in a direction to increase an attenuation amount of the input attenuator; (2) means for setting and controlling the attenuation range in a direction to decrease the amount of attenuation of the input attenuator when the power level value obtained by the unknown power detection means is lower than a predetermined lower limit value; In the later attenuation range,
The frequency range of the section including the power measurement band of the signal under measurement is swept by the frequency conversion unit, and the power of the signal under measurement is measured and calculated.
Means for setting and controlling the optimum attenuation range based on the measured power value; and controlling the gain of the intermediate frequency variable gain amplifier in conjunction with the setting of the attenuation range to bring the gain of the entire measurement system into a predetermined state. A modulation analyzer comprising: a means for controlling a gain;
衰器により減衰させ、減衰した未知電力減衰信号を受け
て周波数変換部で所定の中間周波数に周波数変換し、こ
れをＩＦフィルタによりフィルタして測定するスペクト
ラムアナライザにおいて、 該入力減衰器によって減衰した未知電力減衰信号を受け
て、該信号を増幅し検波して該入力減衰器の出力端にお
ける未知電力レベルを検出する手段と、 第１に該未知電力検出手段で得た電力レベル値が所定上
限値より高い場合は該入力減衰器の減衰量を増加する方
向に減衰レンジを適設定制御し、第２に該未知電力検出
手段で得た電力レベル値が所定下限値より低い場合は該
入力減衰器の減衰量を減少する方向に減衰レンジを設定
制御する手段と、 上述で得た減衰レンジ及び前後の減衰レンジにおいて、
被測定信号のパワー測定帯域を含む区間を周波数変換部
で周波数掃引して被測定信号の電力を各々測定算出し、
この測定電力値をもとに最適な減衰レンジに設定制御す
る手段と、 該減衰レンジの設定に連動して中間周波数の可変ゲイン
アンプのゲインを制御して測定系全体のゲインを所定の
状態にゲイン制御する手段と、 以上を具備していることを特徴としたスペクトラムアナ
ライザ。2. A signal under measurement of unknown power is received and attenuated by an input attenuator. The attenuated unknown power signal is received and frequency-converted to a predetermined intermediate frequency by a frequency conversion unit. Means for receiving an unknown power attenuated signal attenuated by the input attenuator, amplifying and detecting the signal, and detecting an unknown power level at an output terminal of the input attenuator; If the power level value obtained by the unknown power detection means is higher than a predetermined upper limit, the attenuation range is appropriately set and controlled in a direction to increase the attenuation of the input attenuator. Means for setting and controlling the attenuation range in a direction to decrease the amount of attenuation of the input attenuator when the power level value is lower than a predetermined lower limit value; At
The frequency range of the section including the power measurement band of the signal under measurement is swept by the frequency conversion unit, and the power of the signal under measurement is measured and calculated.
Means for setting and controlling the optimum attenuation range based on the measured power value; and controlling the gain of the intermediate frequency variable gain amplifier in conjunction with the setting of the attenuation range to bring the gain of the entire measurement system into a predetermined state. A spectrum analyzer, comprising: means for controlling gain;
衰器により減衰させ、減衰した未知電力減衰信号を受け
て周波数変換部で所定の中間周波数に周波数変換し、こ
れをＩＦフィルタによりフィルタし、変調解析部に供給
して変調解析を行う変調解析装置において、 周波数変換部は周波数を非掃引とし、変調解析部内の周
波数変換部で更に低い第２の中間周波数信号に変換した
信号を受けて、該第２の中間周波数信号の３次高調波成
分まで信号処理可能な高速ＡＤ変換器を用いてデジタル
データに変換して該第２の中間周波数信号の３次高調波
成分を測定する手段と、 前記３次高調波成分の測定手段により該入力減衰器の減
衰レンジの減衰量を順次変えて各々３次高調波成分を測
定する手段と、 前記で得た３次高調波成分の各減衰レンジ毎の値を受け
て、３次高調波成分が増加に転ずる減衰レンジを特定
し、これから入力減衰器の減衰レンジを最適レンジに設
定する手段と、 該最適レンジ設定に連動して中間周波数の可変ゲインア
ンプのゲインを制御して測定系全体のゲインを所定の状
態にゲイン制御する手段と、 以上を具備していることを特徴とした変調解析装置。3. An unknown power attenuated signal is received and attenuated by an input attenuator. The attenuated unknown power attenuated signal is received and frequency-converted to a predetermined intermediate frequency by a frequency conversion unit, which is filtered by an IF filter. In a modulation analysis apparatus for performing modulation analysis by supplying the signal to a modulation analysis unit, the frequency conversion unit sets the frequency to non-sweep and receives a signal converted to a lower second intermediate frequency signal by a frequency conversion unit in the modulation analysis unit. Means for converting the second intermediate frequency signal into digital data using a high-speed AD converter capable of processing up to the third harmonic component of the second intermediate frequency signal and measuring the third harmonic component of the second intermediate frequency signal Means for measuring the third harmonic component by sequentially changing the attenuation of the attenuation range of the input attenuator by the third harmonic component measuring means; and each attenuation of the third harmonic component obtained above. Per range Means for specifying the attenuation range in which the third harmonic component is turned to increase, and setting the attenuation range of the input attenuator to the optimum range from this value. Variable gain of the intermediate frequency in conjunction with the optimum range setting A means for controlling the gain of an amplifier to control the gain of the entire measurement system to a predetermined state, and a modulation analyzer comprising the above.
衰器により減衰させ、減衰した未知電力減衰信号を受け
て周波数変換部で所定の中間周波数に周波数変換し、こ
れをＩＦフィルタによりフィルタして測定するスペクト
ラムアナライザにおいて、 周波数変換部は周波数を非掃引とし、変調解析部内の周
波数変換部で更に低い第２の中間周波数信号に変換した
信号を受けて、該第２の中間周波数信号の３次高調波成
分まで信号処理可能な高速ＡＤ変換器を用いてデジタル
データに変換して該第２の中間周波数信号の３次高調波
成分を測定する手段と、 前記３次高調波成分の測定手段により該入力減衰器の減
衰レンジの減衰量を順次変えて３次高調波成分を各々測
定する手段と、 前記で得た３次高調波成分の各減衰レンジ毎の値を受け
て、３次高調波成分が増加に転ずる減衰レンジを特定
し、これから入力減衰器の減衰レンジを最適レンジに設
定する手段と、 該最適レンジ設定に連動して中間周波数の可変ゲインア
ンプのゲインを制御して測定系全体のゲインを所定の状
態にゲイン制御する手段と、 以上を具備していることを特徴としたスペクトラムアナ
ライザ。4. A signal under measurement of unknown power is received and attenuated by an input attenuator. The attenuated unknown power attenuated signal is received and frequency-converted to a predetermined intermediate frequency by a frequency conversion unit. In the spectrum analyzer for measuring the frequency, the frequency conversion unit sets the frequency to non-sweep, receives the signal converted to a lower second intermediate frequency signal by the frequency conversion unit in the modulation analysis unit, and receives the second intermediate frequency signal. Means for converting the data into digital data using a high-speed AD converter capable of processing signals up to the third harmonic component and measuring the third harmonic component of the second intermediate frequency signal; and measuring the third harmonic component Means for measuring the third harmonic component by sequentially changing the attenuation amount of the attenuation range of the input attenuator, and receiving the value of the third harmonic component obtained for each attenuation range by 3 A means for specifying an attenuation range in which the next harmonic component starts to increase and for setting the attenuation range of the input attenuator to the optimum range, and controlling the gain of the intermediate frequency variable gain amplifier in conjunction with the setting of the optimum range. A spectrum analyzer comprising: a means for controlling the gain of the entire measurement system to a predetermined state;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9223474A JPH1164405A (en) | 1997-08-20 | 1997-08-20 | Modulation analysis device and spectrum analyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9223474A JPH1164405A (en) | 1997-08-20 | 1997-08-20 | Modulation analysis device and spectrum analyzer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1164405A true JPH1164405A (en) | 1999-03-05 |
Family
ID=16798713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9223474A Pending JPH1164405A (en) | 1997-08-20 | 1997-08-20 | Modulation analysis device and spectrum analyzer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1164405A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002214259A (en) * | 2001-01-22 | 2002-07-31 | Toyo Commun Equip Co Ltd | Frequency analyzer |
| WO2005073737A1 (en) * | 2004-01-29 | 2005-08-11 | Advantest Corporation | Measurement device, method, program, and recording medium |
| JP2007033197A (en) * | 2005-07-26 | 2007-02-08 | Sony Corp | Method and program for identifying generation source of electromagnetic wave interference signal |
| JP2010278911A (en) * | 2009-05-29 | 2010-12-09 | Sony Corp | Signal processing device, signal processing method and reception system |
| JP2015042960A (en) * | 2013-08-26 | 2015-03-05 | 横河電機株式会社 | Light measuring apparatus |
| CN107994963A (en) * | 2017-12-27 | 2018-05-04 | 京信通信系统（中国）有限公司 | A kind of power detector extended detection range method and apparatus |
| JP2019052906A (en) * | 2017-09-14 | 2019-04-04 | アンリツ株式会社 | Signal analyzer and method for optimizing dynamic range of signal analyzer |
-
1997
- 1997-08-20 JP JP9223474A patent/JPH1164405A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002214259A (en) * | 2001-01-22 | 2002-07-31 | Toyo Commun Equip Co Ltd | Frequency analyzer |
| WO2005073737A1 (en) * | 2004-01-29 | 2005-08-11 | Advantest Corporation | Measurement device, method, program, and recording medium |
| KR100809947B1 (en) * | 2004-01-29 | 2008-03-07 | 가부시키가이샤 아드반테스트 | Measurement device, method and recording medium |
| JP2007033197A (en) * | 2005-07-26 | 2007-02-08 | Sony Corp | Method and program for identifying generation source of electromagnetic wave interference signal |
| JP2010278911A (en) * | 2009-05-29 | 2010-12-09 | Sony Corp | Signal processing device, signal processing method and reception system |
| EP2257006A3 (en) * | 2009-05-29 | 2015-11-11 | Sony Corporation | Signal processing device, method and reception system for adjusting a measured power spectrum |
| JP2015042960A (en) * | 2013-08-26 | 2015-03-05 | 横河電機株式会社 | Light measuring apparatus |
| JP2019052906A (en) * | 2017-09-14 | 2019-04-04 | アンリツ株式会社 | Signal analyzer and method for optimizing dynamic range of signal analyzer |
| CN107994963A (en) * | 2017-12-27 | 2018-05-04 | 京信通信系统（中国）有限公司 | A kind of power detector extended detection range method and apparatus |
| CN107994963B (en) * | 2017-12-27 | 2023-11-24 | 京信网络系统股份有限公司 | Method and device for expanding detection range of power detector |
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