JPH03139022A - Transmission and reception circuit for mobile radio equipment - Google Patents
Transmission and reception circuit for mobile radio equipmentInfo
- Publication number
- JPH03139022A JPH03139022A JP1278077A JP27807789A JPH03139022A JP H03139022 A JPH03139022 A JP H03139022A JP 1278077 A JP1278077 A JP 1278077A JP 27807789 A JP27807789 A JP 27807789A JP H03139022 A JPH03139022 A JP H03139022A
- Authority
- JP
- Japan
- Prior art keywords
- band
- frequency
- transmission
- transmitting
- output
- 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
- 230000005540 biological transmission Effects 0.000 title abstract description 18
- 238000001914 filtration Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 9
- 230000001413 cellular effect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/02—Details
- H03J3/06—Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges
- H03J3/08—Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges by varying a second parameter simultaneously with the tuning, e.g. coupling bandpass filter
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/09—Filters comprising mutual inductance
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/17—Structural details of sub-circuits of frequency selective networks
- H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
- H03H7/1775—Parallel LC in shunt or branch path
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
- H04B1/405—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with multiple discrete channels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/725—Cordless telephones
- H04M1/72502—Cordless telephones with one base station connected to a single line
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Circuits Of Receivers In General (AREA)
- Mobile Radio Communication Systems (AREA)
- Superheterodyne Receivers (AREA)
- Noise Elimination (AREA)
- Transceivers (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、自動車電話とかコードレス電話とか、その他
の移動無線機などに組み込まれて無ｍ電波の送受信の人
力段に使用される移動無線用送受信回路に関する。[Detailed Description of the Invention] (Field of Industrial Application) The present invention is applicable to mobile radios that are incorporated into car phones, cordless telephones, and other mobile radios and are used for manual transmission and reception of wireless radio waves. Related to transmitting/receiving circuits.
（従来の技術）
第４図および第５図はそれぞれマルチチャンネルアクセ
ス方式の移動無線機の一例としてＵＳセルラー、つまり
、無線電波の受信周波数帯域が８６９ＭＨｚ 〜８９４
ＭＨｚ 、無ｍ電波の送信周波数帯域が８２４ＭＨｚ
〜８４９ＭＨｚとなる周波数レンジのものを採用した自
動車電話に組み込まれる各従来例の送受信回路のブロッ
ク図である。(Prior Art) FIGS. 4 and 5 each show an example of a mobile radio device using a multi-channel access method using US cellular, that is, the receiving frequency band of radio waves is 869 MHz to 894 MHz.
MHz, the transmission frequency band of wireless radio waves is 824MHz
1 is a block diagram of each conventional transmitting/receiving circuit incorporated in a car telephone employing a frequency range of 849 MHz.
第４図に示される従来例の送受信回路にあっては、無線
電波の送受信兼用アンテナ２で受信された上記受信周波
数帯域内にある受信信号が受信側バンドパスフィルタ４
でフィルタされてのち、ミキサ６に与えられるとともに
、そのミキサ６において周波数選択制御部としての受信
側ＰＬＬシンセサイザ８で周波数制御されるＶＣＯ（電
圧制御型発振器）１０の出力と共に４５ＭＨｚの中間周
波数に変換されたうえで、中間周波数フィルタ１２でフ
ィルタされてのち図示していない後段の音声検波回路で
音声検波される。In the conventional transmitting/receiving circuit shown in FIG.
After being filtered by the filter, it is applied to the mixer 6, and in the mixer 6, it is converted to an intermediate frequency of 45 MHz together with the output of a VCO (voltage controlled oscillator) 10 whose frequency is controlled by a receiving side PLL synthesizer 8 as a frequency selection control section. The signal is then filtered by an intermediate frequency filter 12, and then detected by a subsequent stage audio detection circuit (not shown).
一方、当該自動車電話固有のダイヤル番号に対応した音
声変調信号は、送信側ＰＬＬシンセサイザ１４で周波数
制御されるＶＣＯ１６でそれに対応した送信周波数の送
信信号に変換されたのち、アンプ１８で増幅されてから
送信側バンドパスフィルタ２０を介してアンテナ２を介
して送信される。On the other hand, the voice modulation signal corresponding to the dial number specific to the car phone is converted into a transmission signal of the corresponding transmission frequency by the VCO 16 whose frequency is controlled by the transmission side PLL synthesizer 14, and then amplified by the amplifier 18. The signal is transmitted via the antenna 2 via the transmitting side bandpass filter 20.
第５図に示される他の従来例の送受信回路にあっても、
第４図と対応する部品、部分に同一の符号で示すように
、送受信兼用のＰＬＬシンセサイザ２２およびＶＣＯ２
４が設けられているとともに、送信側にミキサ２６が付
加されている点を除いては第４図のそれと同様に無ｆｓ
電波の送受信を行うようになっている。Even in the other conventional transmitting/receiving circuit shown in FIG.
As shown by the same reference numerals for parts and parts corresponding to those in FIG. 4, a PLL synthesizer 22 and a VCO 2 for both transmission and reception
4 is provided, and a mixer 26 is added to the transmitting side.
It is designed to send and receive radio waves.
（発明が解決しようとする課題）
上記各従来例の送受信回路にあっては、相対する送信と
受信のバンドパスフィルタのフィルタ特性がそれぞれ周
波数帯域外において相互のクロストークを防止するため
に充分な減衰特性を持つこと、それぞれの周波数帯域内
においては明瞭な送受信を行うために送受信信号のレベ
ルの減衰ロスがないこと、および、それぞれの周波数帯
域の離間差が２０ＭＨｚと狭いために周波数帯域内外で
の減衰カーブが急峻であることといった送受信周波数処
理上の要求を満足する必要があることから、高Ｑの高価
な誘電体フィルタが採用されている現状にあった。(Problems to be Solved by the Invention) In each of the conventional transmitting and receiving circuits described above, the filter characteristics of the opposing transmitting and receiving bandpass filters are sufficient to prevent mutual crosstalk outside the frequency band. It has attenuation characteristics, there is no attenuation loss in the level of the transmitted and received signals to ensure clear transmission and reception within each frequency band, and the difference between the two frequency bands is as narrow as 20 MHz, so it is possible to transmit and receive clearly within each frequency band. Because it is necessary to satisfy requirements for transmitting/receiving frequency processing, such as having a steep attenuation curve, expensive dielectric filters with a high Q are currently being used.
しかしながら、上記従来例ではこのような高価な誘電体
フィルタが送受信側それぞれ１個、つまり合計で少なく
とも２個必要であったから部品コストが高くつくことに
なるうえ、高Ｑ特性になるほどその物理的サイズが大き
くなることから、安価でかつ小型の自動車電話を提供す
る場合の大きな問題となっていた。However, in the conventional example described above, such expensive dielectric filters were required, one each on the transmitting and receiving sides, that is, at least two in total, which resulted in high component costs.In addition, the higher the Q characteristic, the larger the physical size of the dielectric filter. This has been a major problem in providing inexpensive and compact car telephones.
したがって、本発明においては、前述の送受信周波数処
理上の要求を誘電体フィルタのような高Ｑのものではな
く通常の低Ｑのバンドパスフィルタでもって満足させる
ことができろようにして自動車電話のような移動無線機
に組み込まれて場合に安価でかつ小型の移動無線機の提
供を可能にすることを目的としている。Therefore, in the present invention, the above-mentioned transmitting/receiving frequency processing requirements can be satisfied with an ordinary low-Q band-pass filter rather than a high-Q filter such as a dielectric filter, so that the mobile phone The purpose of the present invention is to provide an inexpensive and compact mobile radio when incorporated into a mobile radio such as the above.
（課題を解決するための手段）
このような目的を達成するために、本発明の移動無線用
送受信回路においては、送信側と受信側のそれぞれに対
応して帯域可変型バンドパスフィルタを設け、各帯域可
変型バンドパスフィルタの帯域レンジを送信と受信の周
波数選択制＠部の出力に基づいて制御することを特徴と
している。(Means for Solving the Problem) In order to achieve such an object, in the mobile radio transmitter/receiver circuit of the present invention, variable band bandpass filters are provided for each of the transmitting side and the receiving side, It is characterized in that the band range of each band variable band pass filter is controlled based on the output of the transmitting and receiving frequency selection control unit.
（作用）
送信と受信それぞれの使用周波数帯域の中で空き周波数
が周波数選択制御部で選択されるとともに、その周波数
選択制御部からはその選択に対応した出力か帯域可変型
バンドパスフィルタに与えられる。帯域可変型バンドパ
スフィルタはその出力に応答して周波数通過帯域を可変
される。上記のようにして周波数通過帯域を可変された
帯域可変型バンドパスフィルタにより、上記空き周波数
に対応した送信信号と受信信号とがそれぞれ送受信され
る。(Function) An empty frequency is selected by the frequency selection control section in the frequency bands used for transmission and reception, and an output corresponding to the selection is given from the frequency selection control section to the band-variable bandpass filter. . The frequency pass band of the variable band band pass filter is varied in response to its output. The variable band bandpass filter whose frequency passband is varied as described above transmits and receives transmission signals and reception signals corresponding to the vacant frequencies, respectively.
したがって、本発明では帯域可変型バンドパスフィルタ
は周波数選択制御部でその周波数帯域か可変されること
から、それ自体は狭帯域型で構成可能となって、誘電体
フィルタのような高Ｑのものではなく通常の低Ｑのもの
で構成されることができる。Therefore, in the present invention, since the frequency band of the variable band band pass filter is varied by the frequency selection control section, it can be configured as a narrow band type, and can be configured as a high Q filter such as a dielectric filter. Instead, it can be constructed from ordinary low-Q materials.
（実施例）
以下、本発明の実施例を図面を参照して詳細に説明する
。(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
第１図は本発明の実施例に係る移動無線用送受信回路の
回路図であって、従来例に係る第４図のそれと対応する
部品、部分には同一の符号を付し、その同一の符号に係
る部品、部分についての説明はここでは省略する。FIG. 1 is a circuit diagram of a mobile radio transmitter/receiver circuit according to an embodiment of the present invention, in which parts and portions corresponding to those in FIG. 4 according to a conventional example are denoted by the same reference numerals. A description of the parts and portions related to this will be omitted here.
上記実施例において従来例と異なる構成は次の通りであ
る。すなわち、本実施例の送受信回路においては、マル
チチャンネルアクセス方式を用いた自動車電話における
従来例の受信側バンドパスフィルタと送信側バンドパス
フィルタとにそれぞれ代えて、狭帯域な、っまり低Ｑ型
の帯域可変型バンドパスフィルタ３０．３２を送受信そ
れぞれに設けている。そして、送信周波数と受信周波数
それぞれの周波数帯域での空き周波数を図示しない手段
で選択するとともに、その選択データに応答して受信側
ＰＬＬシンセサイザ８ではその空き受信周波数に対応し
た選択制御出力をＶＣＯ１０と受信側帯域可変型バンド
パスフィルタ３０とにそれぞれ出力し、同様にその選択
データに応答して送信側ＰＬＬシンセサイザＩ４ではそ
の空き送信周波数に対応した選択制御出力をＶＣＯ１６
と送信側帯域可変型バンドパスフィルタ３２とにそれぞ
れ出力するように構成されている。これにより、例えば
その空き受信周波数が８９０ＭＨｚ （図中の実線）あ
るいは８７０ＭＨｚ（図中の破線）であるとすれば、受
信側ＰＬＬシンセサイザ８はアンテナ２で受信された８
９０ＭＨｚあるいは８７０ＭＨｚの受信信号が受信側
帯域可変型バンドパスフィルタ３０でフィルタされるよ
うにするとともに、ミキサ６出力が４５ＭＨｚの中間周
波数となるようにＶ’Ｃ０ＩＯに選択制御出力を与える
。The configurations of the above embodiment that differ from the conventional example are as follows. That is, in the transmitting/receiving circuit of this embodiment, narrow-band, low-Q type filters are used in place of the conventional receiving-side bandpass filter and transmitting-side bandpass filter in a car phone using a multi-channel access system. Variable band bandpass filters 30 and 32 are provided for each transmission and reception. Then, an empty frequency in each of the frequency bands of the transmitting frequency and the receiving frequency is selected by a means not shown, and in response to the selection data, the receiving side PLL synthesizer 8 outputs a selection control output corresponding to the empty receiving frequency to the VCO 10. Similarly, in response to the selection data, the transmission side PLL synthesizer I4 outputs a selection control output corresponding to the vacant transmission frequency to the VCO 16.
and the transmitting side variable band bandpass filter 32, respectively. As a result, if the free reception frequency is, for example, 890 MHz (solid line in the figure) or 870 MHz (broken line in the figure), the receiving side PLL synthesizer 8
A receiving signal of 90 MHz or 870 MHz is filtered by the variable band pass filter 30 on the receiving side, and a selection control output is given to V'C0IO so that the output of the mixer 6 has an intermediate frequency of 45 MHz.
これにより、受信側帯域可変型バンドパスフィルタ３０
からは８９０ＭＨｚあるいは８７０ＭＨｚの受信信号が
フィルタされてミキサ６に与えられる。同様に、空き送
信周波数が８４５ＭＨｚあるいは８２５ＭＨｚであると
すれば、送信側ＰＬＬシンセサイザ１４は音声変調出力
がＶＣＯ１６で８４５ＭＨｚあるいは８２５ＭＨｚに変
換されるようにするとともに、送信側帯域可変型バンド
パスフィルタ３２のフィルタ帯域特性が８４５ Ｍ Ｈ
２あるいは８２５ＭＨｚとなるようにする選択制御出力
をそれぞれＶＣＯＩ ６と送信側帯域可変型バンドパス
フィルタ３２に与える。As a result, the receiving side variable band bandpass filter 30
The received signal of 890 MHz or 870 MHz is filtered and given to the mixer 6. Similarly, if the available transmission frequency is 845 MHz or 825 MHz, the transmitting side PLL synthesizer 14 converts the audio modulation output to 845 MHz or 825 MHz by the VCO 16, and converts the transmitting side variable bandpass filter 32. Filter band characteristic is 845 MH
2 or 825 MHz is provided to the VCOI 6 and the variable bandpass filter 32 on the transmitting side, respectively.
したがって、各帯域可変型バンドパスフィルタ３０．３
２は上記周波数をそれぞれフィルタすることができると
よいことになるから、ＵＳセルラーを用いた従来例では
各バンドパスフィルタ間は２０ＭＨｚ離間した箇所で信
号をフィルタさせることが必要であったのが、本実施例
での各帯域可変型バンドパスフィルタ３０．３２相互間
においては、同じくＵＳセルラーにおいて４５ＭＨｚ弱
離間した箇所で信号をフィルタすることができればよい
ことになって、帯域可変型バンドパスフィルタ３０．３
２を低Ｑのもので構成することができる。Therefore, each band variable band pass filter 30.3
2, it would be good to be able to filter each of the above frequencies, so in the conventional example using US cellular, it was necessary to filter the signal at a point separated by 20 MHz between each bandpass filter, but, In this embodiment, between the variable band band pass filters 30 and 32, it is sufficient that signals can be filtered at locations separated by a little less than 45 MHz in US cellular, so the variable band band pass filters 30 and 32 .3
2 can be composed of a low Q material.
第２図は上記各帯域可変型バンドパスフィルタの電気的
回路図であって、端子３４はアンテナ２に接続される端
子であるとともに、端子３６は受信側帯域可変型バンド
パスフィルタ３０であればミキサ６に、送信側帯域可変
型バンドパスフィルタ３２であればアンプ１８にそれぞ
れ接続される端子である。また、可変容量ダイオード３
８，４０は、受信側帯域可変型バンドパスフィルタ３０
であれば受信側ＰＬＬシンセサイザ８の出力により容量
制御され、送信側帯域可変型バンドパスフィルタ３２で
あれば送信側ＰＬＬシンセサイザ！４の出力により容量
制御されるようになっている。FIG. 2 is an electrical circuit diagram of each of the variable band band pass filters described above, in which the terminal 34 is a terminal connected to the antenna 2, and the terminal 36 is a terminal connected to the variable band band pass filter 30 on the receiving side. If the mixer 6 and the transmitting side variable band bandpass filter 32 are used, these terminals are connected to the amplifier 18, respectively. In addition, variable capacitance diode 3
8 and 40 are variable bandpass filters 30 on the receiving side;
If so, the capacity is controlled by the output of the PLL synthesizer 8 on the receiving side, and if it is the variable bandpass filter 32 on the transmitting side, the PLL synthesizer on the transmitting side! The capacity is controlled by the output of 4.
第３図は本発明の他の実施例に係る移動無線用送受信回
路の回路図であって、従来例に係る第５図と対応する部
品、部分には同一の符号を付すとともに、その同一の符
号に係る部品、部分についての説明はここでは省略する
。FIG. 3 is a circuit diagram of a mobile radio transmitter/receiver circuit according to another embodiment of the present invention, in which parts and portions corresponding to those in FIG. 5 according to the conventional example are given the same reference numerals, and the same Descriptions of parts and portions associated with reference numerals will be omitted here.
この実施例においては第１図のそれと同様にして空き周
波数を用いているとともに、送受信兼用ＰＬＬシンセサ
イザ２２の出力により送信側と受信側それぞれの帯域可
変型バンドパスフィルタ３０．３２のフィルタ特性を制
御している。また、その帯域可変型バンドパスフィルタ
３０．３２の電気的回路構成は第１図と同様に第２図の
回路構成のものが用いられている。In this embodiment, an empty frequency is used in the same manner as in FIG. are doing. Further, the electrical circuit configuration of the band-variable bandpass filters 30 and 32 is the same as that shown in FIG. 2 as in FIG. 1.
なお、本実施例ではＵＳセルラー以外の自動車電話等の
移動無線用の送受信回路にも同様に適用することができ
ることは勿論である。It goes without saying that this embodiment can be similarly applied to transmitting/receiving circuits for mobile radios such as car phones other than US cellular phones.
（発明の効果）
以上説明したことから明らかなように本発明によれば、
送信側と受信側のそれぞれに対応して帯域可変型バンド
パスフィルタを設け、各帯域可変型バンドパスフィルタ
の帯域レンジを送信と受信の周波数選択制御部の出力に
基づいて制御するように構成したから、周波数選択制御
部からの選択制御出力が各帯域可変型バンドパスフィル
タに与えられると、各帯域可変型バンドパスフィルタは
その出力に応答して周波数通過帯域を可変される。(Effects of the Invention) As is clear from the above explanation, according to the present invention,
Variable band bandpass filters are provided for each of the transmitting and receiving sides, and the band range of each variable bandpass filter is controlled based on the outputs of the transmitting and receiving frequency selection controllers. When the selection control output from the frequency selection control section is given to each band-variable band-pass filter, each band-variable band-pass filter has its frequency pass band varied in response to the output.
この周波数通過帯域が可変された帯域可変型バンドパス
フィルタにより、それに対応した送信信号と受信信号と
がそれぞれ送受信されるから、帯域可変型バンドパスフ
ィルタそれ自体は狭帯域型で構成可能となって、透電体
フィルタのような高Ｑのものではなく通常の低Ｑの乙の
で構成することができる。したがって、本発明において
は、送受信の各信号のフィルタを従来例の誘電体フィル
タのような高Ｑのものではなく通常の低Ｑのバンドパス
フィルタでもって行わせることができることになるため
、自動車電話のような移動無線機に組み込まれて使用さ
れた場合にはその移動無線機を安価でかつ小型のものに
することができる。This variable band band pass filter with a variable frequency pass band transmits and receives the corresponding transmit and receive signals, so the variable band band pass filter itself can be configured as a narrow band type. , instead of a high-Q filter like a conductive filter, it can be constructed of a normal low-Q filter. Therefore, in the present invention, each signal to be transmitted and received can be filtered by an ordinary low-Q band-pass filter instead of a high-Q filter like the conventional dielectric filter. When used in a mobile radio device such as a mobile radio device, the mobile radio device can be made inexpensive and compact.
第１図ないし第３図は本発明に係り、第１図は本発明の
実施例に係る移動無線用送受信回路の回路図、第２図は
第１図の帯域可変型バンドパスフィルタの電気的回路図
、第３図は本発明の他の実施例に係る移動無線用送受信
回路の回路図である。
第４図および第５図はそれぞれ各従来例に係る移動無線
用送受信回路の回路図である。
２・・・アンテナ、６，２６・・・ミキサ、８・・・受
信側ＰＬＬシンセサイザ、１０，１６．２４・ＶＣＯ。
１４・・・送信側ＰＬＬシンセサイザ、２２・・・送受
信兼用ＰＬＬシンセサイザ、３０・・・受信側帯域可変
型バンドパスフィルタ、３２・・・送信側帯域可変型バ
ンドパスフィルタ。1 to 3 relate to the present invention, FIG. 1 is a circuit diagram of a mobile radio transmitting/receiving circuit according to an embodiment of the present invention, and FIG. 2 is an electrical diagram of the variable band bandpass filter of FIG. Circuit Diagram FIG. 3 is a circuit diagram of a mobile radio transmitting/receiving circuit according to another embodiment of the present invention. FIGS. 4 and 5 are circuit diagrams of mobile radio transmitter/receiver circuits according to conventional examples, respectively. 2... Antenna, 6, 26... Mixer, 8... Receiving side PLL synthesizer, 10, 16. 24. VCO. 14... Transmission side PLL synthesizer, 22... PLL synthesizer for both transmitting and receiving purposes, 30... Receiving side band variable band pass filter, 32... Transmitting side band variable band pass filter.
Claims (1)
バンドパスフィルタを設け、各帯域可変型バンドパスフ
ィルタの帯域レンジを送信と受信の周波数選択制御部の
出力に基づいて制御することを特徴とする移動無線用送
受信回路。(1) A variable band band pass filter is provided for each of the transmitting side and the receiving side, and the band range of each variable band band pass filter is controlled based on the output of the transmitting and receiving frequency selection control units. A mobile radio transmitter/receiver circuit featuring:
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1278077A JPH03139022A (en) | 1989-10-24 | 1989-10-24 | Transmission and reception circuit for mobile radio equipment |
| GB9023156A GB2238193B (en) | 1989-10-24 | 1990-10-24 | Transmitting/receiving circuit for mobile radio communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1278077A JPH03139022A (en) | 1989-10-24 | 1989-10-24 | Transmission and reception circuit for mobile radio equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03139022A true JPH03139022A (en) | 1991-06-13 |
Family
ID=17592324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1278077A Pending JPH03139022A (en) | 1989-10-24 | 1989-10-24 | Transmission and reception circuit for mobile radio equipment |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH03139022A (en) |
| GB (1) | GB2238193B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996042134A1 (en) * | 1995-06-09 | 1996-12-27 | Matsushita Electric Industrial Co., Ltd. | Amplifier |
| JP2016046548A (en) * | 2014-08-19 | 2016-04-04 | シャープ株式会社 | Communication device |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0722971A (en) * | 1993-07-06 | 1995-01-24 | Mitsubishi Electric Corp | Radio communication equipment |
| EP0680673B1 (en) * | 1993-11-22 | 2001-10-04 | Koninklijke Philips Electronics N.V. | A telecommunication system, and a first station, a second station, and a transceiver for use in such a system |
| JPH11205172A (en) * | 1998-01-12 | 1999-07-30 | Alps Electric Co Ltd | Tuner for satellite broadcasting receiver |
| FR2793619B1 (en) * | 1999-05-10 | 2001-08-10 | Cit Alcatel | DEVICE AND METHOD FOR PRODUCING A FILTER SIGNAL HAVING A GIVEN FREQUENCY AND A HERTZIAN TRANSMITTER TRANSMITTING AT A FREQUENCY ESTABLISHED BY A FREQUENCY ADJUSTABLE OSCILLATOR |
| KR100703366B1 (en) * | 2004-12-21 | 2007-04-03 | 삼성전자주식회사 | Apparatus for eliminating noise of wireless transceiver |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57502030A (en) * | 1980-12-29 | 1982-11-11 |
-
1989
- 1989-10-24 JP JP1278077A patent/JPH03139022A/en active Pending
-
1990
- 1990-10-24 GB GB9023156A patent/GB2238193B/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57502030A (en) * | 1980-12-29 | 1982-11-11 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996042134A1 (en) * | 1995-06-09 | 1996-12-27 | Matsushita Electric Industrial Co., Ltd. | Amplifier |
| JP2016046548A (en) * | 2014-08-19 | 2016-04-04 | シャープ株式会社 | Communication device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2238193B (en) | 1993-12-15 |
| GB2238193A (en) | 1991-05-22 |
| GB9023156D0 (en) | 1990-12-05 |
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