JPH03169127A - Transmitter-receiver with loopback test function in its own station - Google Patents
Transmitter-receiver with loopback test function in its own stationInfo
- Publication number
- JPH03169127A JPH03169127A JP1308766A JP30876689A JPH03169127A JP H03169127 A JPH03169127 A JP H03169127A JP 1308766 A JP1308766 A JP 1308766A JP 30876689 A JP30876689 A JP 30876689A JP H03169127 A JPH03169127 A JP H03169127A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- output
- local oscillator
- transmitting
- receiving device
- 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
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- 238000012360 testing method Methods 0.000 title claims abstract description 25
- 230000005540 biological transmission Effects 0.000 claims abstract description 31
- 230000008878 coupling Effects 0.000 claims abstract description 12
- 238000010168 coupling process Methods 0.000 claims abstract description 12
- 238000005859 coupling reaction Methods 0.000 claims abstract description 12
- 238000010586 diagram Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
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- Monitoring And Testing Of Transmission In General (AREA)
Abstract
Description
【発明の詳細な説明】
〔概要〕
同一局内に設けられた周波数Ｆｔの送信信号を出力する
送信装置と，周波数Ｆ．．の受信信号を入力する受信装
置が、自局内で送信信号を受信信号に折り返して伝送特
性を試験する機能を有する送受信装置に関し、
折り返し試験の為の特別な周波数変換器を必要とせずに
送信装置と受信装置が運用中に適宜に実施可能な自局内
折り返し試験の機能を具えた送受信装置を目的とし、
送信装置の出力の送信信号の一部を受信装置の入力の受
信信号に結合させる結合手段と該送信装置内の局部発振
器の出力の一部を受信装置内の第２の局部発振器の出力
に替って受信装置の周波数変換器に供給する切替手段と
を具え、折返し試験時に、受信装置の受信入力に結合し
た送信装置の出力の周波数Ｆｒの送信信号を，受信の局
部発振器の出力に替って供給された送信の局部発振器の
出力の一部とミクスし周波数変換して，中間周波数の受
信信号を出力するように構或する。DETAILED DESCRIPTION OF THE INVENTION [Summary] A transmitter that outputs a transmission signal of frequency Ft provided in the same station, and a transmitter that outputs a transmission signal of frequency Ft. ．． Regarding a transmitting/receiving device that inputs a received signal of and a coupling means for coupling a part of the transmitted signal output from the transmitting device to the received signal input to the receiving device. and switching means for supplying a part of the output of the local oscillator in the transmitting device to the frequency converter of the receiving device instead of the output of the second local oscillator in the receiving device. The transmission signal of the frequency Fr of the output of the transmitting device coupled to the reception input of is mixed with a part of the output of the transmission local oscillator supplied instead of the output of the reception local oscillator, frequency-converted, and the intermediate frequency is obtained. It is configured to output a received signal.
本発明は同一局内に設けられた送信装置と受信装置が、
自局内で送信信号を受信信号に折り返して伝送特性を試
験できる機能を有する送受信装置に関する。The present invention provides that a transmitting device and a receiving device provided in the same station are
The present invention relates to a transmitting/receiving device having a function of testing transmission characteristics by returning a transmitted signal to a received signal within its own station.
同一局内に設けられた送信装置と受信装置は、定期保守
時あるいは障害時における特性確認のための簡易試験と
して、自局内で送信装置の出力信号を受信装置の入力信
号に折り返して伝送特性を試験する所謂自局内折り返し
試験が行われる。The transmission characteristics of the transmitting device and receiving device installed in the same station are tested by looping back the output signal of the transmitting device into the input signal of the receiving device within the own station as a simple test to confirm the characteristics during regular maintenance or in the event of a failure. A so-called internal return test is conducted.
従来の自局内折り返し試験は、第３図に示す如く、送信
信号の周波数Ｆｔの送信装１１と受信信号の周波数Ｆｒ
の受信装置２とは別に、自局内に？信装置１の送信周波
数Ｆｔを受信装置２の受信周波数Ｆｒに周波数変換する
折り返し試験のための周波数変換器３を用意し、送信装
置１の出力と受信装置２の入力を夫々，スイッチ４■４
■により外部の周波数変換器３に切り替えて試験を実施
していた。As shown in FIG. 3, in the conventional local loopback test, the transmitter 11 has the frequency Ft of the transmitted signal and the frequency Fr of the received signal.
In your own station, separate from receiving device 2? A frequency converter 3 for frequency conversion of the transmission frequency Ft of the transmission device 1 to the reception frequency Fr of the reception device 2 is prepared, and the output of the transmission device 1 and the input of the reception device 2 are connected to switches 4 and 4, respectively.
The test was conducted by switching to the external frequency converter 3 due to (3).
なお、多重無線方式では、送信装置１の送信チャネルの
周波数ＦＬと，受信装置２の受信チャネルの周波数Ｆｒ
の関係は一定であり、例えば、６ＧＨｚ帯では，第４図
の如き周波数配置に定められていて、同一偏波のチャネ
ル間隔は８０ ＭＨｚであり，一対となる送受信チャネ
ル間隔は充分に離れた３４０ ＭＨｚである。Note that in the multiplex radio system, the frequency FL of the transmission channel of the transmitting device 1 and the frequency Fr of the receiving channel of the receiving device 2 are
For example, in the 6 GHz band, the frequency arrangement is determined as shown in Figure 4, the channel spacing of the same polarization is 80 MHz, and the spacing of a pair of transmitting and receiving channels is 340 MHz, which is sufficiently far apart. It is MHz.
従来の自局内折り返し試験は、上述の如く、送信装置１
の送信周波数Ｆｔを，受信装置２の受信周波数Ｆｒに周
波数変換する特別の周波数変換器３を用意せねばならな
いので、保守時あるいは障害時における特性確認のため
の簡易試験としては大袈裟であり、迅速な試験が出来な
いという問題があった。本発明は特別な周波数変換器を
必要とせずに送信装置と受信装置の運用中に適宜に実施
可能な自局内折り返し試験機能を具えた送受信装置の提
供を課題とする。In the conventional local call back test, as mentioned above, the transmitting device 1
A special frequency converter 3 must be prepared to convert the transmission frequency Ft of the receiver 2 to the reception frequency Fr of the receiver 2, so it is too exaggerated to be used as a simple test to confirm characteristics during maintenance or failure. There was a problem that it was not possible to conduct a proper test. An object of the present invention is to provide a transmitting/receiving device having an intra-station loopback test function that can be carried out appropriately during operation of the transmitting device and the receiving device without requiring a special frequency converter.
この課題は、第１図の如く、送信装置１の出力の周波数
Ｆｔの送信信号の一部を受信装置２の入力の周波数Ｆｒ
の受信信号に結合させる結合手段１０（カップラ１４，
サーキュレータ２２）と、送信装置１の出力の送信周波
数Ｆｔに周波数変換する為に送信の変調された中間周波
信号ＩＰ，とミクスする送信の局部発振器１６の出力の
一部を受信の局部発振器２６の出力に替って受信装置２
の周波数変換器２４に供給する切替手段２０（分岐ハイ
ブリッド１７，局発スイッチ２７）を具え、試験時には
、結合手段１０により受信装置２の周波数Ｆｒの受信入
力に結合した送信装置１の出力周波数Ｆｔの送信信号を
、切替手段２０により受信の局部発振器２６の出力に替
って供給される送信の局部発振器１６の出力の一部とミ
クスし周波数変換して中間周波数の受信信号ＩＦｒを出
力する様にした本発明によって解決される。 本発明の
自局内折り返し機能を具えた送受信装置の基本構或を示
す第１図の原理図において、１は、中間周波数の変調さ
れた送信信号を送信の局部発振器１６の出力とミクスし
周波数変換して周波数Ｆｔの送信信号を出力する送信装
置である。As shown in FIG.
Coupling means 10 (coupler 14,
A part of the output of the transmitting local oscillator 16 is mixed with the transmitting modulated intermediate frequency signal IP to convert the frequency to the transmitting frequency Ft of the output of the transmitting device 1. Receiving device 2 instead of output
The output frequency Ft of the transmitting device 1 is connected to the receiving input of the frequency Fr of the receiving device 2 by the coupling means 10 during the test. The transmitting signal is mixed with a part of the output of the transmitting local oscillator 16 supplied instead of the output of the receiving local oscillator 26 by the switching means 20, and the frequency is converted to output the intermediate frequency received signal IFr. This problem is solved by the present invention. In the principle diagram of FIG. 1 showing the basic structure of a transmitting/receiving device equipped with an intra-station loopback function of the present invention, 1 mixes the intermediate frequency modulated transmission signal with the output of the local oscillator 16 for frequency conversion. This is a transmitting device that outputs a transmission signal of frequency Ft.
２は、送信装置１と同一局内に設けられ、周波数Ｆｒの
受信信号を入力し、受信の局部発振器２６の出力と泉ク
スし周波数変換して中間周波数の受信信号を出力する受
信装置である。Reference numeral 2 denotes a receiving device that is provided in the same station as the transmitting device 1, receives a received signal of frequency Fr, converts the frequency with the output of the receiving local oscillator 26, and outputs a received signal of an intermediate frequency.
１０は、送信装置１の出力の周波数Ｆ２の送信信号の一
部を受信装置２の周波数Ｆｒの受信入力に結合させる結
合手段である．
２０は、送信装置１の出力周波数Ｆｔの送信信号に周波
数変換する為に送信の変調された中間周波信号と泉クス
する送信の局部発振器１６の出力の一部を、受信の局部
発振器２６の出力に替って、受信装置２の周波数変換器
２４に供給する切替手段である。Reference numeral 10 denotes a coupling means for coupling a part of the transmission signal of the frequency F2 output from the transmitter 1 to the receiving input of the receiver 2 of the frequency Fr. 20 is a part of the output of the transmitting local oscillator 16, which is mixed with the modulated intermediate frequency signal of the transmitter in order to convert the frequency into a transmitting signal of the output frequency Ft of the transmitter 1, and the output of the receiving local oscillator 26. Instead, it is a switching means that supplies the frequency converter 24 of the receiving device 2.
そして試験時に、結合手段ＩＯにより受信装置２の周波
数Ｆｒの受信入力に結合した送信装置１の出力周波数Ｆ
ｔの送信信号を、切替手段２０により受信の局部発振器
２６の出力に替って供給された送信の局部発振器ｌ６の
出力の一部とミクスし周波数変換して中間周波数の受信
信号を出力するように構或する。During the test, the output frequency F of the transmitting device 1 is coupled to the reception input of the frequency Fr of the receiving device 2 by the coupling means IO.
The switching means 20 mixes the transmission signal of t with a part of the output of the transmission local oscillator l6 supplied instead of the output of the reception local oscillator 26, converts the frequency, and outputs a reception signal of an intermediate frequency. It will be considered.
本発明の結合手段ＩＯは、送信装置１の出力の周波数Ｆ
ｔの送信信号の一部を、受信装置２０周波数Ｆｔの受信
人力に結合させ、切替手段２０は、送信装置ｌの出力周
波数Ｆｒの送信信号に周波数変換する為に、送一信の変
調された中間周波信号とミクスする送信の局部発振器１
６の出力の一部を、受信の局部発振器２６の出力に替っ
て、受信装置２の周波数変換器２４に供給する。そして
試験時は、結合手段１０により受信装置２の周波数Ｆｒ
の受信入力に結合した送信装置１の出力周波数Ｆｒの送
信信号を、切替手段２０により受信の局部発振器２６の
出力に替って供給された送信の局部発振器１６の出力の
一部とミクスし周波数変換し、中間周波数の受信信号を
出力する。従って本発明の送受信装置は特別な周波数変
換器を必要とせずに送信装置と受信装置の運用中に適宜
に自局内折り返し試験を実施することが可能となり問題
は解決される。The coupling means IO of the present invention has a frequency F of the output of the transmitting device 1.
The switching means 20 couples a part of the transmitted signal of t to the receiving power of the receiving device 20 with a frequency Ft, and the switching means 20 converts a part of the transmitted signal of the transmitting device 1 into a transmitted signal of the output frequency Fr of the transmitting device 1. Transmission local oscillator 1 mixed with intermediate frequency signal
6 is supplied to the frequency converter 24 of the receiving device 2 in place of the output of the receiving local oscillator 26. During the test, the frequency Fr of the receiving device 2 is
The transmission signal of the output frequency Fr of the transmitter 1 coupled to the reception input of the transmitter 1 is mixed by the switching means 20 with a part of the output of the transmission local oscillator 16 supplied instead of the output of the reception local oscillator 26. converts and outputs a received signal at an intermediate frequency. Therefore, the transmitting/receiving device of the present invention can appropriately perform an intra-station loopback test during operation of the transmitting device and receiving device without requiring a special frequency converter, and the problem is solved.
第２図は本発明の実施例の自局内折り返し試験機能を具
えた送受信装置の構或を示すブロック図であって、同じ
回路構戒の２組の送受信装置＃１奮２を同時に動作させ
る所謂Ｔｗｉｎ−ｐａｔｈシステムの片方の送受信装置
！Ｉ１に適用した実施例である。FIG. 2 is a block diagram showing the configuration of a transmitting/receiving device equipped with an internal loopback test function according to an embodiment of the present invention, and is a so-called system in which two sets of transmitting/receiving devices #1 and #2 with the same circuit configuration operate simultaneously. One transmitter/receiver of the Twin-path system! This is an example applied to I1.
第２図の実施例において、結合手段１０は、送受信装置
＃１の送信装置１内のカップラ１４と受信装置２内のサ
ーキュレータ２２で構威され、送信装置１のカップラ１
４が送信装置１の出力の周波数Ｆｔの送信出力、例えば
＋３０ｄＢｍ（７）一部Ｏ ｄＢｍを、受信装置２内の
減衰量が３０ｄＢの減衰器ＡＴＴを介して，入力の周波
数Ｆｒの受信信号に，サーキュレータ２２で結合させ，
−３０ｄＢｍの周波数Ｆ２の送信信号を入力する。また
、切替千段２０は、送信装置１内の分岐ハイブリッド■
７と受信装置２内の局発スイッチ２７で構威され、送信
装置１の分岐ハイブリッド１７が、送信の変調器ＭＯＤ
からの変調された中間周波信号ＩＦを，送信装置１の出
力の周波数Ｆｔの送信信号に周波数変換する為に，その
中間周波信号ＩＰとミクサ１１のＴ ＭＩＸでミクスす
る送信の局部発振器工６のＴ ＬＯの出力の一部を分岐
し、受信装１Ｆ２内の局発スイッチ２７のＬＯ Ｓｌ＋
が、受信の局部発振器２６のＲ ＬＯの出力に替って、
受信装置２の周波数変換器２４のＲ ＭＩＸに供給する
．通常動作時は、切替手段２０の受信装置２内の局発ス
イッチ２７は受信局発ＲＬＯ ２６を選択している。そ
して試験時は、切替手段２０の受信装置２内の局発スイ
ッチ２７を制御器ＣＯＮＴから切替え、結合手段１０の
カップラ１４とサーキュレータ２２により、受信装置２
の入力の周波数Ｆｒの受信信号に結合した送信装置１の
出力周波数Ｆｔの送信信号を、送信装置ｌ内の分岐ハイ
ブリッド１７で分岐し，受信装置２内の局発スイッチ２
７により受信の局部発振器２６の出力に替って供給され
た送信の局部発振器ｌ６の出力の一部とミクスし周波数
変換して、中間周波数の受信信号を復調器ＯＥＭへ出力
する。従って第２図の実施例のＴｉ＋ｉｎ− ｐａ ｔ
ｈシステムの送受信装置１１Ｌ＃２の片方の送受信装置
＃ｌは、従来の特別な外部周波数変換装置を必要と廿ず
に、送受信装置ｌｌ２が運用中に、送受信装置Ｉ１１の
受信装置２内の局発スイッチ２７を適宜に切り替え、自
局内折り返し試験を実施することが可能なので問題は無
い。In the embodiment shown in FIG.
4 is the transmission output of the output frequency Ft of the transmitter 1, for example +30 dBm (7) A part of O dBm is converted into the received signal of the input frequency Fr through an attenuator ATT with an attenuation amount of 30 dB in the receiver 2. , coupled by a circulator 22,
Input a transmission signal of frequency F2 of -30 dBm. In addition, the switching stage 20 is a branch hybrid in the transmitting device 1.
7 and a local switch 27 in the receiving device 2, and the branch hybrid 17 of the transmitting device 1 is connected to the transmitting modulator MOD.
In order to frequency-convert the modulated intermediate frequency signal IF from the transmitter 1 into a transmission signal with a frequency Ft output from the transmitter 1, the transmitting local oscillator 6 mixes the intermediate frequency signal IP with the mixer 11 T MIX. A part of the T LO output is branched to the LO Sl+ of the local oscillator switch 27 in the receiver 1F2.
However, instead of the RLO output of the receiving local oscillator 26,
The signal is supplied to the R MIX of the frequency converter 24 of the receiving device 2. During normal operation, the local switch 27 in the receiving device 2 of the switching means 20 selects the receiving station RLO 26. During testing, the local switch 27 in the receiving device 2 of the switching means 20 is switched from the controller CONT, and the coupler 14 and circulator 22 of the coupling means 10 cause the receiving device 2 to
The transmission signal of the output frequency Ft of the transmitting device 1 coupled to the received signal of the input frequency Fr is branched by the branching hybrid 17 in the transmitting device
7, it is mixed with a part of the output of the transmitting local oscillator 16 supplied in place of the output of the receiving local oscillator 26, frequency-converted, and the intermediate frequency received signal is output to the demodulator OEM. Therefore, Ti+in-pat of the embodiment of FIG.
One of the transmitting/receiving devices 11L#2 of the h system, the transmitting/receiving device #l, can convert the station in the receiving device 2 of the transmitting/receiving device I11 while the transmitting/receiving device 112 is in operation, without requiring a conventional special external frequency conversion device. There is no problem because it is possible to carry out a return test within the local station by appropriately switching the originating switch 27.
以上説明した如く、本発明によれば、従来の特別な周波
数変換器を必要とせずに、自局内折り返し試験を実施す
ることが可能となるので、定期保守時や障害発生時に送
受信装置の特性の点検作業を迅速に実施できる効果が得
られる。As explained above, according to the present invention, it is possible to conduct loopback tests within the local station without the need for a conventional special frequency converter, so that the characteristics of the transmitting/receiving device can be checked during regular maintenance or when a failure occurs. This has the effect of allowing inspection work to be carried out quickly.
第１図は本発明の自局内折り返し試験機能を具えた送受
信装置の基本構戒を示す原理図・第２図は本発明の実施
例の自局内折り返し試験機能を具えた送受信装置の構戒
を示すブロック図、第３図は従来の送受信装置の自局内
折り返し試験のブロック図、
第４図は本発明の動作を説明するための多重無線方式の
チャネルの周波数配置図である。
図において、１は送信装置、２は受信装置、ｌＯは結合
手段、１４はカフプラ、ｌ６は送信の局部発振器、ｌ７
は分岐ハイブリッド、２０は切替手段、２２はサーキュ
レータ、２６は受信の局部発振器、２７は局発スイッチ
である。
１
送信装置
２
受信装置
本発明の自局内折ｌ）返しε式ｊｉｌ！模能乙鼻え７１
壺信装置の基本構成左ホす涼裡図
第 １ 図
「ｔ ： 送イ言周Ｊ支，｛ろ〔
Ｆｒ ： ｅ儒周シ＆程
Ｆ３ ： シフト周５皮者又
Ｆｓ＝Ｆｔ Ｆｒ
従来の公ビテ椙装置の自局内相−１）返Ｌ％式験のフ゛
゜ロック図ＥｊＡｚ（ｕ３０ 〜クＩＩＯＭＨｚ）ＣＣ
１１２ Ｒｅｃ，３Ｆ！４−Ａ本発明の動作を説明す
るＴηの多重無縁方式の屯，ネ）レの罰波駅配盟図Fig. 1 is a principle diagram showing the basic configuration of a transmitting/receiving device equipped with an internal loopback test function according to the present invention. Fig. 2 is a principle diagram showing the configuration of a transmitting/receiving device equipped with an internal loopback test function according to an embodiment of the present invention. FIG. 3 is a block diagram of an intra-station loopback test of a conventional transmitting/receiving device, and FIG. 4 is a frequency allocation diagram of channels in a multiplex radio system for explaining the operation of the present invention. In the figure, 1 is a transmitting device, 2 is a receiving device, lO is a coupling means, 14 is a coupler, l6 is a local oscillator for transmission, and l7
20 is a branch hybrid, 20 is a switching means, 22 is a circulator, 26 is a receiving local oscillator, and 27 is a local oscillator switch. 1 Transmitting device 2 Receiving device Return within the local station of the present invention l) Return ε type jil! Mono Otohanae 71
The basic configuration of the vase device is shown in Figure 1. Local station internal phase of public equipment - 1) Block diagram of return L% formula EjAz (u30 ~ II MHz) CC
112 Rec, 3F! 4-A A configuration diagram of Tη's multiple unconnected system for explaining the operation of the present invention.
Claims (1)
る送信装置（１）と、周波数Ｆ＿ｒの受信信号を入力す
る受信装置（２）が、自局内で送信信号を受信信号に折
り返して伝送特性を試験する機能を有する送受信装置で
あって、該送信装置（１）の出力の送信信号の一部を受
信装置（２）の入力の受信信号に結合させる結合手段（
１０）と、該送信装置（１）内の局部発振器（１６）の
出力の一部を受信装置内の第２の局部発振器（２６）の
出力に替えて受信装置（２）の周波数変換器（２４）に
供給する切替手段（２０）とを具え、折返し試験時に、
受信装置（２）の受信入力に結合した送信装置（１）の
出力周波数Ｆ＿ｔの送信信号を、受信の局部発振器（２
６）の出力に替って供給された送信の局部発振器（１６
）の出力の一部とミクスし周波数変換して、中間周波数
の受信信号を出力するようにしたことを特徴とする自局
内折り返し試験機能を具えた送受信装置。A transmitting device (1) that outputs a transmitted signal with a frequency F_t and a receiving device (2) that inputs a received signal with a frequency F_r, which are installed in the same station, return the transmitted signal to a received signal within their own station to determine the transmission characteristics. A transmitter/receiver having a function to be tested, the coupling means (
10) and a frequency converter (2) of the receiving device (2) by replacing part of the output of the local oscillator (16) in the transmitting device (1) with the output of the second local oscillator (26) in the receiving device. 24) and a switching means (20) for supplying the
The transmission signal of the output frequency F_t of the transmitting device (1) coupled to the receiving input of the receiving device (2) is transmitted to the receiving local oscillator (2).
Transmission local oscillator (16) supplied in place of the output of
1.) A transmitting/receiving device equipped with an in-station loopback test function, characterized in that the signal is mixed with a part of the output of the device (2), frequency-converted, and outputted as a received signal at an intermediate frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1308766A JPH03169127A (en) | 1989-11-28 | 1989-11-28 | Transmitter-receiver with loopback test function in its own station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1308766A JPH03169127A (en) | 1989-11-28 | 1989-11-28 | Transmitter-receiver with loopback test function in its own station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03169127A true JPH03169127A (en) | 1991-07-22 |
Family
ID=17985042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1308766A Pending JPH03169127A (en) | 1989-11-28 | 1989-11-28 | Transmitter-receiver with loopback test function in its own station |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03169127A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05218986A (en) * | 1992-01-23 | 1993-08-27 | Nec Corp | Check device for transmitter-receiver |
| US7471220B2 (en) | 2004-07-16 | 2008-12-30 | Infineon Technologies Ag | Electronic test circuit for an integrated circuit and methods for testing the driver strength and for testing the input sensitivity of a receiver of the integrated circuit |
-
1989
- 1989-11-28 JP JP1308766A patent/JPH03169127A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05218986A (en) * | 1992-01-23 | 1993-08-27 | Nec Corp | Check device for transmitter-receiver |
| US7471220B2 (en) | 2004-07-16 | 2008-12-30 | Infineon Technologies Ag | Electronic test circuit for an integrated circuit and methods for testing the driver strength and for testing the input sensitivity of a receiver of the integrated circuit |
| DE102004034606B4 (en) * | 2004-07-16 | 2012-03-29 | Infineon Technologies Ag | Circuit arrangement comprising an electronic test circuit for a transceiver to be tested and from the transceiver to be tested, and also a method for testing a transceiver |
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