JPH0783318B2 - Radio equipment test circuit - Google Patents
Radio equipment test circuitInfo
- Publication number
- JPH0783318B2 JPH0783318B2 JP2091273A JP9127390A JPH0783318B2 JP H0783318 B2 JPH0783318 B2 JP H0783318B2 JP 2091273 A JP2091273 A JP 2091273A JP 9127390 A JP9127390 A JP 9127390A JP H0783318 B2 JPH0783318 B2 JP H0783318B2
- Authority
- JP
- Japan
- Prior art keywords
- test circuit
- antenna
- local oscillator
- mixer
- frequency
- 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.)
- Expired - Lifetime
Links
Landscapes
- Monitoring And Testing Of Transmission In General (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、無線装置を構成する送信部および受信部が正
常に動作しているか否かをチェックするための試験回路
に関するものである。TECHNICAL FIELD The present invention relates to a test circuit for checking whether or not a transmitting unit and a receiving unit that form a wireless device are operating normally.
第３図は従来の試験回路を示すブロック系統図である。
同図において、ANは送受空中線、１は空中線共用器、２
は送信部、３は受信部、４は送信部２および受信部３を
制御し、さらに信号の授受を行なう制御部、５は送信出
力を分配する分配回路、６は受信部３の入力へ信号を結
合する結合器、７は局部発振器、８は混合器、９は局部
発振器７および混合器８の動作を制御するスイッチング
回路である。FIG. 3 is a block system diagram showing a conventional test circuit.
In the figure, AN is a transmission / reception antenna, 1 is an antenna duplexer, 2
Is a transmitting unit, 3 is a receiving unit, 4 is a controlling unit for controlling the transmitting unit 2 and the receiving unit 3, and is further for transmitting and receiving signals, 5 is a distribution circuit for distributing the transmission output, and 6 is a signal to the input of the receiving unit 3. Is a local oscillator, 8 is a mixer, and 9 is a switching circuit for controlling the operations of the local oscillator 7 and the mixer 8.
次に動作について説明する。通常は送信部２からの出力
は空中線共用器１を通り、送受空中線ANから送出され、
また送受空中線ANに受信された信号は空中線共用器１を
通り、受信部３へ入力され、信号が復調される。Next, the operation will be described. Normally, the output from the transmission unit 2 passes through the antenna duplexer 1 and is transmitted from the transmission / reception antenna AN,
Further, the signal received by the transmission / reception antenna AN passes through the antenna duplexer 1 and is input to the reception unit 3, where the signal is demodulated.
次に試験時の動作について説明する。制御部４から試験
モード信号が出力され、スイッチング回路９を通った
後、局部発振器７および混合器８を駆動する。一方、送
信部２の出力は分配器５で分配された後、混合器８にお
いて局部発振器７の出力と混合される。Next, the operation during the test will be described. The test mode signal is output from the control unit 4, passes through the switching circuit 9, and then drives the local oscillator 7 and the mixer 8. On the other hand, the output of the transmitter 2 is distributed by the distributor 5 and then mixed with the output of the local oscillator 7 in the mixer 8.
ここで、局部発振器７の発振周波数は送信周波数fTと受
信周波数fRの差または和の周波数とする。混合器８の出
力は周波数が受信周波数fRとなり、結合器６で結合され
た後、受信部３へ入力される。つまり、送信部２からの
出力が試験回路で折り返され、受信部３で復調されるた
め、送信部２の動作、受信部３の動作が正常に行なわれ
ているか否かをチェックすることができる。Here, the oscillation frequency of the local oscillator 7 is the difference or sum of the transmission frequency f T and the reception frequency f R. The frequency of the output of the mixer 8 becomes the reception frequency f R , and after being combined by the combiner 6, it is input to the receiving unit 3. That is, since the output from the transmitter 2 is returned by the test circuit and demodulated by the receiver 3, it is possible to check whether the operation of the transmitter 2 and the operation of the receiver 3 are normally performed. .
従来の試験回路は以上のように構成されているので、試
験回路をロジック雑音が発生する制御部４と同じ基板に
実装することができず、また、高周波部（送信部出力側
および受信部入力側）において分配・結合を行なうた
め、高周波の回り込み等により試験回路が不安定になる
などの問題があった。Since the conventional test circuit is configured as described above, the test circuit cannot be mounted on the same substrate as the control unit 4 in which logic noise is generated, and the high frequency unit (transmitter output side and receiver input side) cannot be mounted. However, there is a problem in that the test circuit becomes unstable due to high-frequency wraparound, etc.
本発明はこのような点に鑑みてなされたものであり、そ
の目的とするところは、試験回路を制御部と同一基板に
実装することが可能となり、このため装置の小型化・低
価格化を実現でき、さらに高周波部で分配・結合をしな
いために回路が安定となり、信頼性が高くなる試験回路
を得ることにある。The present invention has been made in view of the above points, and it is an object of the present invention to allow a test circuit to be mounted on the same substrate as a control unit, which reduces the size and cost of the device. It is to obtain a test circuit that can be realized, and the circuit is stable because the distribution / coupling is not performed in the high frequency part, and the reliability is high.
このような目的を達成するために本発明は、試験回路空
中線と、混合器と、局部発振器と、スイッチング回路と
を備え、試験回路空中線は無線装置の送受空中線と或る
結合量で結合し、混合器は試験回路空中線からの信号と
局部発振器からの信号とを混合して試験回路空中線へ再
送出し、局部発振器は混合器から試験回路空中線へ再送
出される信号の周波数が受信周波数となる周波数で発振
し、スイッチング回路は混合器と局部発振器とを制御す
るようにしたものである。In order to achieve such an object, the present invention comprises a test circuit antenna, a mixer, a local oscillator, and a switching circuit, the test circuit antenna is coupled to the transmitting and receiving antenna of the wireless device with a certain coupling amount, The mixer mixes the signal from the test circuit antenna with the signal from the local oscillator and retransmits it to the test circuit antenna, and the local oscillator has a frequency at which the frequency of the signal retransmitted from the mixer to the test circuit antenna becomes the reception frequency. The switching circuit oscillates and controls the mixer and the local oscillator.
本発明による無線装置の試験回路は、試験モード時、局
部発振器を動作させ、試験回路空中線に受信される送信
波と局部発振器出力とを混合器にて混合し、受信周波数
に変換した後、試験回路空中線から再送出し、無線装置
の送受空中線で受信し、受信部へ入力させ、送信信号を
そのまま復調することにより、試験を行なう。The test circuit of the wireless device according to the present invention operates the local oscillator in the test mode, mixes the transmission wave received by the test circuit antenna with the output of the local oscillator by the mixer, and after converting to the reception frequency, performs the test. The test is performed by retransmitting from the circuit antenna, receiving by the transmitting and receiving antenna of the wireless device, inputting to the receiving unit, and demodulating the transmission signal as it is.
以下、本発明の実施例を図について説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第１図は本発明による無線装置の試験回路の一実施例を
示すブロック系統図である。同図において、10は試験回
路空中線、11は局部発振器、12は試験回路空中線10に受
信された信号と局部発振器11の出力信号とを混合する混
合器、13は局部発振器11および混合器12の動作を制御す
るスイッチング回路である。第１図において第３図と同
一部分又は相当部分には同一符号が付してある。FIG. 1 is a block system diagram showing an embodiment of a test circuit for a wireless device according to the present invention. In the figure, 10 is a test circuit antenna, 11 is a local oscillator, 12 is a mixer for mixing the signal received by the test circuit antenna 10 and the output signal of the local oscillator 11, 13 is the local oscillator 11 and the mixer 12 It is a switching circuit that controls the operation. In FIG. 1, the same or corresponding parts as those in FIG. 3 are designated by the same reference numerals.
通常の動作は従来技術の動作と同様である。Normal operation is similar to that of the prior art.
次に試験時の動作について述べる。制御部４から試験モ
ード信号が出力され、スイッチング回路13を通った後、
この信号により局部発振器11および混合器12が駆動され
る。Next, the operation during the test will be described. After the test mode signal is output from the control unit 4 and passes through the switching circuit 13,
This signal drives the local oscillator 11 and the mixer 12.
送信部２の出力は空中線共用器１を通った後、空中線AN
から送出されるが、送信出力の一部が空間結合され、試
験回路空中線10にて受信される。The output of the transmitter 2 passes through the antenna duplexer 1 and then the antenna AN
However, a part of the transmission output is spatially coupled and received by the test circuit antenna 10.
混合器12では上記試験回路空中線10で受信された送信出
力の一部と局部発振器11の出力とが混合され、その混合
出力は再び試験回路空中線10から再送出される。局部発
振器11の発振周波数は従来技術と同様、送信周波数fTと
受信周波数fRとの差または和の周波数とする。In the mixer 12, a part of the transmission output received by the test circuit antenna 10 is mixed with the output of the local oscillator 11, and the mixed output is retransmitted from the test circuit antenna 10 again. The oscillation frequency of the local oscillator 11 is the difference or the sum of the transmission frequency f T and the reception frequency f R , as in the prior art.
試験回路空中線10から再送出される波の周波数は受信周
波数fRとなり、この波は空中線ANで受信された後、空中
線共用器１を通り受信部３に入力され、ここで復調され
る。つまり、試験モード時は制御部４から試験用信号を
送信部２へ送出し、高周波信号に変換された後、空間に
て折り返され、さらに受信部３にて信号を復調され、制
御部４にて照合するため、送信部２、受信部３、空中線
共用器１、送受空中線AN等すべての回路素子の動作が正
常に行なわれているか否かをチェックすることができ
る。The frequency of the wave retransmitted from the test circuit antenna 10 becomes the reception frequency f R , and this wave is received by the antenna AN, then input to the receiving unit 3 through the antenna duplexer 1 and demodulated there. That is, in the test mode, the control unit 4 sends a test signal to the transmission unit 2, is converted into a high-frequency signal, is then folded back in space, and the reception unit 3 demodulates the signal, and the control unit 4 receives the demodulated signal. Therefore, it is possible to check whether or not all the circuit elements such as the transmitting unit 2, the receiving unit 3, the antenna duplexer 1, the transmitting and receiving antenna AN are operating normally.
ただし、送受空中線ANと試験回路空中線10の結合量は適
当な値とする。However, the coupling amount between the transmission / reception antenna AN and the test circuit antenna 10 is an appropriate value.
なお、上記実施例では、送受空中線ANの近傍に試験回路
空中線10を設け、両空中線を空間にて結合される例につ
いて説明したが、空中線共用器１と送受空中線ANとの間
に微少ループによる結合器（カップラ）を挿入しても同
様の効果を奏する。In the above embodiment, the example in which the test circuit antenna 10 is provided in the vicinity of the transmission / reception antenna AN and both antennas are connected in space has been described. However, a small loop is formed between the antenna duplexer 1 and the transmission / reception antenna AN. The same effect can be obtained by inserting a coupler.
第２図において、14は微少ループによる結合器であり、
送信部２の出力は空中線共用器１を通った後、結合器
（カップラ）14で結合され、送信出力の一部は混合器12
へ接続される。一方、局部発振器11と混合された受信周
波数fRの出力は結合器14を通り、さらに空中線共用器１
を通った後、受信部３へ入力され、復調される。なお、
第２図において第１図と同一部分又は相当部分には同一
符号が付してある。In FIG. 2, 14 is a coupler with a minute loop,
The output of the transmission unit 2 passes through the antenna duplexer 1 and is then combined by a coupler (coupler) 14, and a part of the transmission output is mixed by the mixer 12.
Connected to. On the other hand, the output of the reception frequency f R mixed with the local oscillator 11 passes through the coupler 14, and the antenna duplexer 1
After passing through, it is input to the receiving unit 3 and demodulated. In addition,
In FIG. 2, the same or corresponding parts as those in FIG. 1 are designated by the same reference numerals.
以上説明したように本発明は、無線装置の空中線と試験
回路空中線とを空間的に結合させ、試験回路空中線に接
続の回路で高周波の折り返し機能を持たせたことによ
り、制御部のロジックの影響を受けることが無くなり、
試験回路を制御部と同一基板に実装することが可能とな
り、装置の小型化・低価格化を実現できる効果がある。As described above, according to the present invention, the antenna of the wireless device and the test circuit antenna are spatially coupled to each other, and the circuit connected to the test circuit antenna has a high-frequency folding function, so that the influence of the logic of the control unit is exerted. Is no longer receiving
It is possible to mount the test circuit on the same substrate as the control unit, and it is possible to realize the downsizing and cost reduction of the device.
また、高周波部で分配・結合をしないので、高周波の回
り込み等も無く試験回路が安定となり、信頼性の高い装
置を得ることができる。Moreover, since the distribution / coupling is not performed in the high frequency section, the test circuit is stable without the high frequency wraparound, and a highly reliable device can be obtained.
第１図は本発明による無線装置の試験回路の一実施例を
示すブロック系統図、第２図は本発明の他の実施例を示
すブロック系統図、第３図は従来の無線装置の試験回路
を示すブロック系統図である。 AN……送受空中線、１……空中線共用器、２……送信
部、３……受信部、４……制御部、10……試験回路空中
線、11……局部発振器、12……混合器、13……スイッチ
ング回路。FIG. 1 is a block system diagram showing an embodiment of a test circuit for a wireless device according to the present invention, FIG. 2 is a block system diagram showing another embodiment of the present invention, and FIG. 3 is a test circuit for a conventional wireless device. It is a block system diagram showing. AN: Transmitting / receiving antenna, 1 ... Antenna duplexer, 2 ... Transmitting section, 3 ... Receiving section, 4 ... Control section, 10 ... Test circuit antenna, 11 ... Local oscillator, 12 ... Mixer, 13 ... Switching circuit.
Claims (1)
いて、試験回路空中線と、混合器と、局部発振器と、ス
イッチング回路とを備え、試験回路空中線は無線装置の
送受空中線と或る結合量で結合し、混合器は試験回路空
中線からの信号と局部発振器からの信号とを混合して試
験回路空中線へ再送出し、局部発振器は混合器から試験
回路空中線へ再送出される信号の周波数が受信周波数と
なる周波数で発振し、スイッチング回路は混合器と局部
発振器とを制御することを特徴とする無線装置の試験回
路。1. A test circuit for a simultaneous transmission / reception wireless device, comprising a test circuit antenna, a mixer, a local oscillator, and a switching circuit, the test circuit antenna having a certain amount of coupling with a transmission / reception antenna of the wireless device. In combination, the mixer mixes the signal from the test circuit antenna with the signal from the local oscillator and retransmits it to the test circuit antenna, and the local oscillator determines the frequency of the signal retransmitted from the mixer to the test circuit antenna as the received frequency. A test circuit for a wireless device, wherein the test circuit oscillates at a frequency and a switching circuit controls a mixer and a local oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2091273A JPH0783318B2 (en) | 1990-04-04 | 1990-04-04 | Radio equipment test circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2091273A JPH0783318B2 (en) | 1990-04-04 | 1990-04-04 | Radio equipment test circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03289729A JPH03289729A (en) | 1991-12-19 |
| JPH0783318B2 true JPH0783318B2 (en) | 1995-09-06 |
Family
ID=14021846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2091273A Expired - Lifetime JPH0783318B2 (en) | 1990-04-04 | 1990-04-04 | Radio equipment test circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0783318B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2841998B2 (en) * | 1992-01-23 | 1998-12-24 | 日本電気株式会社 | Transceiver inspection equipment |
-
1990
- 1990-04-04 JP JP2091273A patent/JPH0783318B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03289729A (en) | 1991-12-19 |
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