JPH11122140A - Radio transmitter-receiver - Google Patents
Radio transmitter-receiverInfo
- Publication number
- JPH11122140A JPH11122140A JP9277460A JP27746097A JPH11122140A JP H11122140 A JPH11122140 A JP H11122140A JP 9277460 A JP9277460 A JP 9277460A JP 27746097 A JP27746097 A JP 27746097A JP H11122140 A JPH11122140 A JP H11122140A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- transmission
- reception
- division ratio
- receiver
- 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
Landscapes
- Transceivers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、送受信で同一周波
数を使用する無線送受信機に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio transceiver using the same frequency for transmission and reception.
【０００２】[0002]
【従来の技術】図３は、従来の一般的な無線送受信機の
構成の一例を示す。信号を入力して変調する変調回路１
と、その変調波を発振回路５の局発信号を搬送波として
周波数変換するミキサー２と、帯域ろ波により必要な周
波数を選択するフィルタ３と、選択周波数を増幅して送
信周波数ｆTの出力をする高周波増幅器４とよりなる送
信装置と、受信周波数ｆRを増幅する高周波増幅器８
と、増幅周波数の帯域ろ波をするフィルタ９と、発振回
路５の局発信号で周波数変換するミキサー１０と、周波
数変換された出力を復調して復調信号を出力する復調回
路１１とからなる受信装置とを有し、該送信装置及び受
信装置が送信受信の切り替えをする送受信切替器６及び
フィルタ７を通してＲＦ入出力に接続される。2. Description of the Related Art FIG. 3 shows an example of the configuration of a conventional general radio transceiver. Modulation circuit 1 for inputting and modulating a signal
When, a mixer 2 for frequency-converting the modulated wave local oscillation signal of the oscillation circuit 5 as a carrier wave, a filter 3 for selecting a desired frequency by band-pass filter, the output of the transmission frequency f T amplifies the selected frequency A transmission device comprising a high-frequency amplifier 4 for performing the transmission and a high-frequency amplifier 8 for amplifying the reception frequency f R
And a filter 9 for filtering the band of the amplification frequency, a mixer 10 for converting the frequency with the local oscillation signal of the oscillation circuit 5, and a demodulation circuit 11 for demodulating the frequency-converted output and outputting a demodulated signal. The transmission device and the reception device are connected to an RF input / output through a transmission / reception switch 6 and a filter 7 for switching between transmission and reception.
【０００３】本構成では送信周波数ｆTと受信周波数ｆR
が同一周波数を使用されている。In this configuration, the transmission frequency f T and the reception frequency f R
Are using the same frequency.
【０００４】[0004]
【発明が解決しようとする課題】一般的な送受信切替器
のアイソレーションは２０〜３０ｄＢ程度であるため、
受信装置の受信動作中に送信装置を動作させると送信出
力が２０〜３０ｄＢ程度減衰した状態で受信装置に入力
される。また送信周波数ｆTと受信周波数ｆRが同一周波
数であるため、受信装置に入力した送信波をフィルタ９
で阻止することができず、受信状態時に送信装置を動作
させると受信装置の感度が低下してしまうという問題が
発生する。Since the isolation of a general transmission / reception switch is about 20 to 30 dB,
When the transmitting device is operated during the receiving operation of the receiving device, the transmission output is input to the receiving device in a state of being attenuated by about 20 to 30 dB. Since the transmission frequency f T and the reception frequency f R are the same frequency, the transmission wave input to the reception device is filtered by the filter 9.
However, if the transmitting device is operated in the receiving state, the sensitivity of the receiving device is reduced.
【０００５】また、この問題を防ぐために、受信状態時
には送信装置を停止させなければならないということも
発生する。[0005] In order to prevent this problem, the transmitting apparatus must be stopped in the receiving state.
【０００６】本発明の目的は、前記問題点を解決するも
のであり、受信動作中でも送信装置の影響を低減するこ
とのできる無線送受信機を提供することにある。An object of the present invention is to solve the above-mentioned problem, and to provide a radio transceiver capable of reducing the influence of a transmitting device even during a receiving operation.
【０００７】[0007]
【課題を解決するための手段】前記の目的は、受信装置
の動作時に送信装置内の周波数を可変させる周波数可変
回路を設けたことによって達成される。The above object is achieved by providing a frequency variable circuit for varying the frequency in the transmitting device when the receiving device operates.
【０００８】前記の手段によれば、受信動作時、送信装
置内の周波数を受信装置の周波数と異なるものとするこ
とができ、それにより受信装置に入力する送信波をフィ
ルタで阻止し、受信時に送信装置が動作することによる
影響を低減できる。According to the above-mentioned means, the frequency in the transmitting device can be made different from the frequency of the receiving device during the receiving operation, whereby the transmitting wave input to the receiving device is blocked by the filter, The effect of the operation of the transmission device can be reduced.
【０００９】[0009]
【発明の実施の形態】以下、本発明の実施の形態を図面
により説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１０】図１は、本発明の一実施形態の構成図であ
る。図において、図３の従来例と同符号は同一部分を示
す。FIG. 1 is a configuration diagram of an embodiment of the present invention. In the figure, the same reference numerals as those in the conventional example of FIG.
【００１１】本発明は、発振回路５の発振する周波数ｆ
LOを分周器１２で分周して送信装置のミキサ２に局発信
号を加え、また分周器１３で分周して受信装置のミキサ
１０に局発信号を加える。分周器１２、１３の分周比は
Ｎ1であり、したがって発振回路５の発振周波数ｆLOは
分周比のＮ1倍された周波数Ｎ1（ｆR−ｆIF）で発振す
る。また、分周器１２は分周比がＮ1の他に分周比Ｎ
2（Ｎ1≠Ｎ2）にも切り替えられ、これは分周器切替信
号を入力して切り替えられる。この切替信号は受信装置
の動作に応動する信号が利用できる。According to the present invention, the frequency f
The LO is divided by a frequency divider 12 to add a local signal to the mixer 2 of the transmitting device, and the frequency is divided by the frequency divider 13 to add a local signal to the mixer 10 of the receiving device. Division ratio of the divider 12, 13 is N 1, thus the oscillation frequency f LO of the oscillation circuit 5 oscillates at the frequency division ratio N 1 times frequency N 1 (f R -f IF) . Further, the frequency divider 12 in addition to the frequency division ratio of the frequency division ratio N 1 N
2 (N 1 ≠ N 2 ), which can be switched by inputting a frequency divider switching signal. As the switching signal, a signal corresponding to the operation of the receiving device can be used.
【００１２】受信装置が動作していない時は、分周器１
２は分周比Ｎ1で動作し、分周器１２からミキサ２に入
力される周波数はｆLO／Ｎ1となり、高周波増幅器４か
ら送受信切替器６を介して送信される送信出力周波数は
ｆTである。これは受信周波数ｆRと同一であるが、受信
装置が動作していなので受信信号に影響はない。When the receiving device is not operating, the frequency divider 1
2 operates at the frequency division ratio N 1 , the frequency input to the mixer 2 from the frequency divider 12 is f LO / N 1 , and the transmission output frequency transmitted from the high-frequency amplifier 4 via the transmission / reception switch 6 is f T. This is the same as the reception frequency f R , but does not affect the reception signal because the reception device is operating.
【００１３】受信装置の動作時は、分周器１２に分周器
切替信号を入力して分周比をＮ1からＮ2に変更する。こ
れにより分周器１２からミキサ２に入力される周波数は
ｆL O／Ｎ2となり、受信装置のミキサ１０に入力される
周波数ｆLO／Ｎ1とは異なるようになる。このときの高
周波増幅器４から出力される送信周波数はｆtとなり結
果として、受信動作時の送信周波数ｆtと受信周波数ｆR
は異なるようになる。During operation of the receiver, a frequency divider switching signal is input to frequency divider 12 to change the frequency division ratio from N 1 to N 2 . Frequency input thereby from the frequency divider 12 to the mixer 2 becomes different from the frequency f LO / N 1 to be input to the mixer 10 of f L O / N 2, and the receiving device. At this time, the transmission frequency output from the high-frequency amplifier 4 is ft , and as a result, the transmission frequency ft and the reception frequency f R during the reception operation
Will be different.
【００１４】ここで分周器１２の分周比Ｎ2を適当に選
択し、受信動作時の送信周波数ｆtをフィルタ３、７、
９の阻止域の周波数になるようにすることにより、送信
周波数ｆtはフィルタ３、７、９で十分に減衰され、受
信動作時に送信装置が動作することによる影響を少なく
することができる。[0014] Select where the frequency division ratio N 2 of the frequency divider 12 suitably, the transmission frequency f t of the time of reception operation filters 3, 7,
By such that the frequency of the stopband of 9, the transmission frequency f t is sufficiently attenuated by the filter 3, 7, 9, the transmitting device during receive operation it is possible to reduce the influence due to work.
【００１５】図２に、受信時の周波数の関係を示す（但
しＮ2＞Ｎ1の場合）。図により分周比Ｎ2を分周比Ｎ1に
比べて大きくとることにより受信周波数ｆRと送信周波
数ｆtとの差が大きくなり、送信装置が受信時に与える
影響をより低減させることができる。FIG. 2 shows the relationship between frequencies at the time of reception (provided that N 2 > N 1 ). The difference between the reception frequency f R and the transmission frequency f t by taking larger than the frequency division ratio N 2 frequency division ratio N 1 by Fig increases, it is possible to further reduce the influence of the transmission device has on the time of reception .
【００１６】また送信動作時は、分周器１２の分周比を
切替信号によりＮ2からＮ1に変更することにより希望の
周波数ｆTで送信させることができる。In the transmission operation, the frequency can be transmitted at a desired frequency f T by changing the frequency division ratio of the frequency divider 12 from N 2 to N 1 by a switching signal.
【００１７】なお、送信装置内の周波数可変回路は分周
器の分周比を切替える以外に、発振回路、周波数シンセ
サイザ等の切替制御を行なう回路でもよい。The frequency variable circuit in the transmission device may be a circuit for controlling the switching of an oscillation circuit, a frequency synthesizer, etc. in addition to switching the frequency division ratio of the frequency divider.
【００１８】[0018]
【発明の効果】以上のように本発明を実施することによ
り、受信動作中に送信装置が動作することによる受信感
度の低下を少なくすることができる。また送信装置の動
作を停止させる必要がないため、送信装置を起動動作さ
せるまでの時間が長い無線送受信機の場合でも受信状態
から送信状態への切替時間が短縮できる。By implementing the present invention as described above, it is possible to reduce the decrease in the receiving sensitivity caused by the operation of the transmitting device during the receiving operation. Further, since there is no need to stop the operation of the transmission device, the time for switching from the reception state to the transmission state can be shortened even in the case of a wireless transceiver that takes a long time to activate the transmission device.
【図１】本発明の一実施形態の構成図。FIG. 1 is a configuration diagram of an embodiment of the present invention.
【図２】本発明の受信時の周波数関係説明図。FIG. 2 is an explanatory diagram of a frequency relationship at the time of reception according to the present invention.
【図３】従来の実施形態の構成図。FIG. 3 is a configuration diagram of a conventional embodiment.
１…変調回路、２…ミキサ、３…フィルタ、４…高周波
増幅器、５…発振回路、６…送受信切替器、７…フィル
タ、８…高周波増幅器、９…フィルタ、１０…ミキサ、
１１…復調回路、１２…分周器、１３…分周器。DESCRIPTION OF SYMBOLS 1 ... Modulation circuit, 2 ... Mixer, 3 ... Filter, 4 ... High frequency amplifier, 5 ... Oscillation circuit, 6 ... Transceiver switch, 7 ... Filter, 8 ... High frequency amplifier, 9 ... Filter, 10 ... Mixer,
11: demodulation circuit, 12: frequency divider, 13: frequency divider.
Claims (1)
同一周波数を使用する無線送受信機において、受信装置
の動作時に送信装置内の周波数を可変させる周波数可変
回路を設けたことを特徴とする無線送受信機。1. A wireless transceiver having a transmitting device and a receiving device and using the same frequency for transmission and reception, characterized in that a frequency variable circuit for varying the frequency in the transmitting device when the receiving device operates is provided. Wireless transceiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9277460A JPH11122140A (en) | 1997-10-09 | 1997-10-09 | Radio transmitter-receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9277460A JPH11122140A (en) | 1997-10-09 | 1997-10-09 | Radio transmitter-receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11122140A true JPH11122140A (en) | 1999-04-30 |
Family
ID=17583906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9277460A Pending JPH11122140A (en) | 1997-10-09 | 1997-10-09 | Radio transmitter-receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11122140A (en) |
-
1997
- 1997-10-09 JP JP9277460A patent/JPH11122140A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5444865A (en) | Generating transmit injection from receiver first and second injections | |
| US6201952B1 (en) | Radio communication apparatus | |
| WO2008050940A2 (en) | Wireless transceiver system for supporting dual mode | |
| JPH06152467A (en) | Radio communication equipment | |
| JP5345858B2 (en) | Device for receiving and / or transmitting radio frequency signals with noise reduction | |
| US6104745A (en) | Transceiver for performing time division full duplex spread spectrum communication | |
| KR20100111616A (en) | Fsk modulation signal receiver with high sensitivity in low rate mode | |
| JP3309904B2 (en) | Wireless transceiver | |
| JP3132491B2 (en) | Tuned preselection filter | |
| JP3828077B2 (en) | Frequency conversion circuit and communication device | |
| JPH11122140A (en) | Radio transmitter-receiver | |
| US6026114A (en) | Transmitting and receiving apparatus of time division full-duplex spread spectrum communication system | |
| JP4087031B2 (en) | Radio equipment for high frequency | |
| JP3464147B2 (en) | Transceiver | |
| JP3084545B2 (en) | Intermediate frequency generation method | |
| JPH06132847A (en) | Trasmitting/receiving frequency band switching radio communication equipment | |
| KR100357858B1 (en) | A advanced frequency shift keying(fsk) rf signal tx/rx apparatus | |
| KR100212054B1 (en) | Transceiver circuits with common used inter frequency | |
| JP3284666B2 (en) | Time division multiplex digital wireless communication device | |
| JPH06260961A (en) | Digital mobile telephone set | |
| JPH06164555A (en) | Frequency diversity communication device | |
| JP3884923B2 (en) | Transceiver | |
| JP4385521B2 (en) | Transceiver | |
| JPH0742284U (en) | RF data transceiver | |
| JP2001069027A (en) | Receiver and transmitting adopting heterodyne system |