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JP4146712B2 - Multi-frequency radio transmitter and receiver - Google Patents

Multi-frequency radio transmitter and receiver Download PDF

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Publication number
JP4146712B2
JP4146712B2 JP2002346085A JP2002346085A JP4146712B2 JP 4146712 B2 JP4146712 B2 JP 4146712B2 JP 2002346085 A JP2002346085 A JP 2002346085A JP 2002346085 A JP2002346085 A JP 2002346085A JP 4146712 B2 JP4146712 B2 JP 4146712B2
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Prior art keywords
frequency
output
switching
amplifier
local oscillation
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JP2004180135A (en
Inventor
秀人 加納
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Kyocera Corp
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Kyocera Corp
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Description

【０００１】
【発明の属する技術分野】
この発明は無線機、特に２つ以上の周波数で送信が可能な無線送信機または受信が可能な無線受信機または２つ以上の周波数で送受信が可能な無線送受信機に関する。
【０００２】
【従来の技術】
図３は２つ以上の周波数で送受信が可能な従来のマルチバンド無線送受信機のうち２バンドタイプの無線送受信機の構成例を示す。
アンテナ１、第１のバンドと第２のバンドの周波数を分波する分波器２、第１のバンドの送受信周波数を共用するための第１バンド共用器３、第２のバンドの送受信周波数を共用するための第２バンド共用器４、第１のバンドの高周波増幅器５、第２のバンドの高周波増幅器６、第１のバンドの不要波を除去するための受信用第１バンドパスフィルタ７、第２のバンドの不要波を除去するための受信用第２バンドパスフィルタ８、受信周波数を受信中間周波数にダウンコンバージョンするための受信用ミキサ９、中間周波フィルタ１０、中間周波増幅器１１、復調器１２、受信用第２局部発振回路１３、第１局部発振回路１４、緩衝増幅器１５、周波数逓倍回路１６、基本波周波数か逓倍周波数のどちらかを選択するスイッチ１７、送信用第２局部発振回路１８、変調器１９、送信周波数にアップコンバージョンするための送信用ミキサ２０、第１のバンドの前置増幅器２１、第２のバンドの前置増幅器２２、第１のバンドの送信用第１バンドパスフィルタ２３、第２のバンドの送信用第２バンドパスフィルタ２４、第１のバンドの電力増幅器２５、第２のバンドの電力増幅器２６、第１のバンドのアイソレータ２７、第２のバンドのアイソレータ２８、信号処理部２９を具備する。
【０００３】
上記構成のマルチバンド無線機において、アンテナ１で受信された第１のバンドの受信信号は、分波器２で第１のバンドの周波数帯に、共用器３で第１のバンドの受信信号に分離された後、第１のバンドの高周波増幅器５に送られ増幅される。増幅された信号は受信用バンドパスフィルタ７で不要波が除去された後、受信用ミキサー９においてスイッチ１７で選択された第１局部発振周波数の基本周波数でダウンコンバージョンされ中間周波信号となる。さらに、中間周波信号は中間周波フィルタ１０で不要波が除去されたあと中間周波増幅器１１で増幅され、復調器１２で復調される。復調された信号は信号処理部２９へ送られる。
【０００４】
一方、信号処理部２９からの送信信号は、変調器１９において送信用第２局部発振回路１８の出力周波数で変調される。変調された送信信号は、送信用ミキサー２０において、スイッチ１７で選択された第１局部発振周波数の基本周波数で送信周波数にアップコンバージョンされた後、第１のバンドの前置増幅器２１で増幅される。増幅された送信信号は、第１のバンドの送信用バンドパスフィルタ２３で不要波が除去され、第１のバンドの電力増幅器２５で規定電力まで増幅される。規定電力まで増幅された送信信号は、第１のバンドのアイソレータ２７、共用器３、分波器２を介してアンテナ１に供給される。
【０００５】
第２のバンドも第１のバンドと同様な構成であるが、スイッチ１７を第２のバンド側に切替えることで局部発振周波数のＮ逓倍の周波数でアップコンバージョンまたはダウンコンバージョンされるので、第１のバンドの周波数とは異なる周波数に対応している。図４に一般的な緩衝増幅器の回路例を示す。図４からわかるように、増幅できる周波数帯は１種類であり、マルチバンドに対応するためには、別途、周波数逓倍回路と周波数選択用のスイッチを設ける必要がある。
【０００６】
先行技術文献として特許文献１には、第１および第２の周波数変換手段を有するスーパーヘテロダイン方式の無線送受信機において、受信系および送信系の第２の周波数変換手段の第２局部発振器を１つの発振器で共用させ、発振器の出力周波数をＮ分周した周波数を受信系の第２の周波数変換手段に供給し、Ｍ分周した周波数を送信系の第２の周波数変換手段に供給する分周手段を設けたものが記載されている。
【０００７】
また、特許文献２には、１つの局部発振回路から出力された所定周波数の信号を周波数逓倍回路によってｍ倍して第１ミキサ回路に入力するとともに、周波数逓倍回路によってｎ倍して第２ミキサ回路に入力するダブルスーパーヘテロダイン回路が記載されている。
【０００８】
【特許文献１】
特開平１０−３２２２３８ 公報 （第１−第７頁）
【特許文献２】
特開平７−２３５８８９ 公報 （第１−第５頁）
【０００９】
【発明が解決しようとする課題】
このように上記従来構成のマルチバンド無線送信機またはマルチバンド無線受信機またはマルチバンド無線送受信機は周波数逓倍回路と、送信または受信用ミキサーに入力する周波数を選択するためのスイッチを有しており、回路の実装面積、消費電力が増大し、これらマルチバンド無線機を利用した携帯電話機の小型化、低消費電力化を図るにあたって大きな障害になっていた。さらに、局部発振周波数の基本波を使用する周波数帯以外の使用周波数帯の数だけ逓倍回路が必要になるという問題があった。
【００１０】
【課題を解決するための手段】
これらの課題を解決するため請求項１に記載の発明は、２つ以上の異なる周波数で送信動作が可能なマルチ周波数無線送信機において、送信周波数へのアップコンバージョン用またはベースバンドの変調用の局部発振回路と、前記局部発振回路の出力を増幅する増幅器と、前記増幅器からの出力とグランドとの間に接続されて、当該出力の整合状態を、切替信号により高周波的にオープンな状態にするか否か切り替えて整合させる周波数を切り替えることにより、前記局部発振回路の出力周波数の所定の逓倍周波数を選択的に出力する切替整合回路とを有することを特徴とした。
【００１１】
請求項２の発明は、２つ以上の異なる周波数で受信動作が可能なマルチ周波数無線受信機において、受信周波数からのダウンコンバージョン用または復調用局部発振回路と、前記局部発振回路の出力を増幅する増幅器と、前記増幅器からの出力とグランドとの間に接続されて、当該出力の整合状態を、切替信号により高周波的にオープンな状態にするか否か切り替えて整合させる周波数を切り替えることにより、前記局部発振回路の出力周波数の所定の逓倍周波数を選択的に出力する切替整合回路を有することを特徴とした。
【００１２】
請求項３の発明は、２つ以上の異なる周波数で送受信動作が可能なマルチ周波数無線送受信機において、送信周波数へのアップコンバージョン用またはベースバンドの変調用であって且つ受信周波数からのダウンコンバージョン用または復調用の送信受信共用の局部発振回路と、前記局部発振回路の出力を増幅する増幅器と、前記増幅器からの出力とグランドとの間に接続されて、当該出力の整合状態を、切替信号により高周波的にオープンな状態にするか否か切り替えて整合させる周波数を切り替えることにより、前記局部発振回路の出力周波数の所定の逓倍周波数を選択的に出力する切替整合回路を有することを特徴とした。
【００１３】
請求項４の発明は、前記切替整合回路は、前記増幅器出力とグランド間に直列接続されるコイルおよびコンデンサと、当該コイルおよびコンデンサをグランドに対してオン状態とするか否かを前記切り替え信号により切り替えるダイオードとを備え、前記オン状態では前記増幅器出力に対するフィルタを構成することを特徴とした。
【００１４】
請求項５の発明は、前記増幅器に前記切替整合回路を複数段備え、それぞれの切替整合回路に入力する切り替え信号を切り替えることにより、複数種の逓倍周波数を選択可能としたことを特徴とした。
【００１５】
【発明の実施の形態】
以下、図面により本発明の一実施形態を説明する。図１は本発明の一実施形態を示すマルチバンド無線送受信機のブロック図である。この図１において図３と同一符号を付した部分は同一内容を示すので説明を省略する。なお、他の図面においても同様とする。
図１に示すように本発明のマルチバンド無線送受信機は、緩衝増幅器１５の出力に、切替信号により整合させる周波数を切り替えることができる切替整合器３０を設け、局部発振回路１４の出力周波数の任意の逓倍周波数を受信ミキサ９および送信ミキサ２０に供給することを特徴とする。
【００１６】
次に図２により切替整合回路の一例の詳細について説明する。切替信号ＳＷ１がＬレベルのとき、ダイオードＤ１はオフ状態にあるため、切替整合回路３０は高周波的にオープン状態で、緩衝増幅器１５の出力は切替整合回路３０が付加されないときと同様の状態になる。一方切替信号ＳＷ１がＨレベルのときダイオードＤ１はオン状態になり、コンデンサＣ１１およびＣ１２は高周波的にグランドに接続され、緩衝増幅器１５の出力の整合状態が変化する。上記作用を利用すれば、切替整合回路３０の各部品の定数選定で局部発振回路１４の出力周波数の所定の逓倍周波数に切替ることができる。また、選択したい逓倍周波数をｎ個としたいときは図５にあるようにｎ組の整合回路３１を構成し、異なる所望の所定逓倍周波数が得られるよう構成した回路の切替信号ＳＷｘをＨレベルにすればよい。このように整合回路３０と切替信号数を増やすことで、簡単に任意の数の周波数郡に対応することができる。さらに、切替整合回路３０の各部品の組み合わせによりフィルタが構成されるため、不要波を抑圧する作用もある。図２の例では、コイルＬ１とコンデンサＣ１２でバンドエリミネーションフィルタを構成している。
【００１７】
上述したように、本実施例によれば切替整合回路を設けることにより、従来必要であった周波数逓倍回路およびスイッチを削除でき消費電力、回路部品を大幅に削減することができるうえ、切替整合回路の各部品の組み合わせによりフィルタを構成することができるので、不要波を抑圧する効果もある。
【００１８】
【発明の効果】
以上説明したように、本発明によれば、下記のような優れた効果が得られる。
１．切替整合回路を設けたことで、従来必要であった周波数逓倍回路およびスイッチを削減でき、消費電力、回路部品を大幅に削減することができる。
２．切替整合回路の各部品の組み合わせによりフィルタを構成することができるため、不要波を抑圧する効果がある。
３．切替整合回路の切替信号を増やすだけで簡単に任意の数の周波数郡に対応することができる。
【図面の簡単な説明】
【図１】本発明の一実施形態を示すマルチバンド無線送受信機の構成を示すブロック図。
【図２】本発明の切替整合回路付き増幅器の回路図。
【図３】従来のマルチバンド無線送受信機の構成を示すブロック図。
【図４】従来の増幅器の回路図。
【図５】本発明の切替整合回路付き増幅器のうち、２種類以上の逓倍周波数を出力できるものの回路図。
【符号の説明】
１：アンテナ
２：分波器
３：第１バンド共用器
４：第２バンド共用器
５：第１のバンドの高周波増幅器
６：第２のバンドの高周波増幅器
７：第１バンドパスフィルタ
８：第２バンドパスフィルタ
９：受信用ミキサ
１０：中間周波フィルタ
１１：中間周波増幅器
１２：復調器
１３：受信用第２局部発振器
１４：第１局部発振器
１５：緩衝増幅器
１６：周波数逓倍回路
１７：スイッチ
１８：送信用第２局部発振器
１９：変調器
２０：送信用ミキサ
２１：第１のバンドの前置増幅器
２２：第２のバンドの前置増幅器
２３：第１バンドパスフィルタ
２４：第２バンドパスフィルタ
２５：第１のバンドの電力増幅器
２６：第２のバンドの電力増幅器
２７：第１のバンドのアイソレータ
２８：第２のバンドのアイソレータ
２９：信号処理部
３０：切替整合回路
３１：切替整合回路
３２：切替整合回路１
３３：切替整合回路２
３４：切替整合回路ｘ
３５：切替整合回路ｎ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a radio, particularly a radio transmitter capable of transmitting at two or more frequencies, a radio receiver capable of receiving, or a radio transceiver capable of transmitting / receiving at two or more frequencies.
[0002]
[Prior art]
FIG. 3 shows a configuration example of a two-band type radio transceiver among conventional multiband radio transceivers capable of transmitting and receiving at two or more frequencies.
The antenna 1, the duplexer 2 that demultiplexes the frequencies of the first band and the second band, the first band duplexer 3 for sharing the transmission / reception frequency of the first band, and the transmission / reception frequency of the second band. A second-band duplexer 4 for sharing, a first-band high-frequency amplifier 5, a second-band high-frequency amplifier 6, a first band-pass filter for reception 7 for removing unnecessary waves in the first band, Second band-pass filter for reception 8 for removing unwanted waves in the second band, reception mixer 9 for down-converting the reception frequency to a reception intermediate frequency, intermediate frequency filter 10, intermediate frequency amplifier 11, demodulator 12, second local oscillation circuit 13 for reception, first local oscillation circuit 14, buffer amplifier 15, frequency multiplication circuit 16, switch 17 for selecting either the fundamental frequency or the multiplication frequency, transmission first Local oscillation circuit 18, modulator 19, transmission mixer 20 for up-conversion to transmission frequency, first band preamplifier 21, second band preamplifier 22, first band transmission first 1 band pass filter 23, second band transmission second band pass filter 24, first band power amplifier 25, second band power amplifier 26, first band isolator 27, second band The isolator 28 and the signal processing unit 29 are provided.
[0003]
In the multiband radio having the above configuration, the received signal of the first band received by the antenna 1 is converted into the first band frequency band by the duplexer 2 and the received signal of the first band by the duplexer 3. After being separated, it is sent to the high frequency amplifier 5 of the first band and amplified. After the unnecessary signal is removed from the amplified signal by the reception band-pass filter 7, the amplified signal is down-converted at the fundamental frequency of the first local oscillation frequency selected by the switch 17 in the reception mixer 9 to be an intermediate frequency signal. Further, after the unnecessary wave is removed by the intermediate frequency filter 10, the intermediate frequency signal is amplified by the intermediate frequency amplifier 11 and demodulated by the demodulator 12. The demodulated signal is sent to the signal processing unit 29.
[0004]
On the other hand, the transmission signal from the signal processing unit 29 is modulated by the modulator 19 at the output frequency of the transmission second local oscillation circuit 18. The modulated transmission signal is up-converted to the transmission frequency at the fundamental frequency of the first local oscillation frequency selected by the switch 17 in the transmission mixer 20, and then amplified by the preamplifier 21 of the first band. . Unnecessary waves are removed from the amplified transmission signal by the first band transmission band-pass filter 23, and the first band power amplifier 25 amplifies the signal to the specified power. The transmission signal amplified to the specified power is supplied to the antenna 1 via the first band isolator 27, duplexer 3, and duplexer 2.
[0005]
The second band has the same configuration as the first band. However, by switching the switch 17 to the second band side, up-conversion or down-conversion is performed at a frequency N times the local oscillation frequency. It corresponds to a frequency different from the frequency of the band. FIG. 4 shows a circuit example of a general buffer amplifier. As can be seen from FIG. 4, there is only one type of frequency band that can be amplified, and in order to support multiband, it is necessary to provide a frequency multiplier and a frequency selection switch separately.
[0006]
As a prior art document, Patent Document 1 discloses a superheterodyne radio transmitter / receiver having first and second frequency conversion means, and includes one second local oscillator of the second frequency conversion means of the reception system and the transmission system. Frequency dividing means for sharing the frequency of the output frequency of the oscillator divided by N to the second frequency converting means of the receiving system and supplying the frequency divided by M to the second frequency converting means of the transmitting system Is provided.
[0007]
Patent Document 2 discloses that a signal having a predetermined frequency output from one local oscillation circuit is multiplied by m by a frequency multiplication circuit and input to a first mixer circuit, and is multiplied by n by a frequency multiplication circuit to be second mixer. A double superheterodyne circuit is described for input to the circuit.
[0008]
[Patent Document 1]
JP 10-322238 A (page 1-7)
[Patent Document 2]
JP-A-7-235889 (Pages 1-5)
[0009]
[Problems to be solved by the invention]
As described above, the multiband radio transmitter, multiband radio receiver or multiband radio transmitter / receiver having the above-described conventional configuration has a frequency multiplying circuit and a switch for selecting a frequency to be input to the mixer for transmission or reception. The mounting area of the circuit and the power consumption have increased, which has been a major obstacle in reducing the size and power consumption of mobile phones using these multiband radios. Furthermore, there has been a problem that the number of frequency multipliers is required for the number of frequency bands used other than the frequency band using the fundamental wave of the local oscillation frequency.
[0010]
[Means for Solving the Problems]
In order to solve these problems, a first aspect of the present invention provides a multi-frequency radio transmitter capable of transmitting operation at two or more different frequencies in a local area for up-conversion to a transmission frequency or baseband modulation. An oscillation circuit, an amplifier that amplifies the output of the local oscillation circuit, and an output from the amplifier that is connected between the output and the ground, and whether the matching state of the output is made open by a switching signal at a high frequency. And a switching matching circuit that selectively outputs a predetermined frequency multiplied by the output frequency of the local oscillation circuit by switching the frequency to be matched.
[0011]
The invention of claim 2 is a multi-frequency radio receiver capable of receiving operation at two or more different frequencies, and amplifies the local oscillation circuit for down-conversion or demodulation from the reception frequency and the output of the local oscillation circuit The amplifier is connected between the output from the amplifier and the ground, and the matching state of the output is switched by switching the frequency to be matched by switching whether or not the switching signal is opened in a high frequency state, It has a switching matching circuit that selectively outputs a predetermined multiplication frequency of the output frequency of the local oscillation circuit.
[0012]
The invention of claim 3 is a multi-frequency radio transceiver capable of transmitting and receiving at two or more different frequencies, for up-conversion to a transmission frequency or for baseband modulation and for down-conversion from a reception frequency. or a local oscillation circuit for transmission and reception shared for demodulation, an amplifier for amplifying the output of the local oscillator circuit, is connected between the output and ground from the amplifier, the matching state of the output by the switching signal It has a switching matching circuit that selectively outputs a predetermined frequency multiplied by the output frequency of the local oscillation circuit by switching the frequency to be matched by switching whether or not to make it open at high frequencies .
[0013]
According to a fourth aspect of the present invention, the switching matching circuit includes a coil and a capacitor connected in series between the amplifier output and the ground, and whether the coil and the capacitor are turned on with respect to the ground based on the switching signal. And a diode for switching, and in the ON state, a filter for the amplifier output is configured .
[0014]
The invention of claim 5 is characterized in that the amplifier includes a plurality of stages of the switching matching circuits, and a plurality of types of multiplication frequencies can be selected by switching switching signals input to the switching matching circuits.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a multiband radio transceiver according to an embodiment of the present invention. In FIG. 1, the same reference numerals as those in FIG. The same applies to other drawings.
As shown in FIG. 1, the multiband radio transceiver of the present invention is provided with a switching matching unit 30 that can switch the frequency to be matched by a switching signal at the output of the buffer amplifier 15, and the output frequency of the local oscillation circuit 14 can be arbitrarily set. Is supplied to the reception mixer 9 and the transmission mixer 20.
[0016]
Next, details of an example of the switching matching circuit will be described with reference to FIG. When the switching signal SW1 is at the L level, the diode D1 is in the off state, so that the switching matching circuit 30 is open at high frequencies, and the output of the buffer amplifier 15 is in the same state as when the switching matching circuit 30 is not added. . On the other hand, when the switching signal SW1 is at the H level, the diode D1 is turned on, the capacitors C11 and C12 are connected to the ground at a high frequency, and the matching state of the output of the buffer amplifier 15 changes. If the above action is used, it is possible to switch to a predetermined multiplied frequency of the output frequency of the local oscillation circuit 14 by selecting constants for each component of the switching matching circuit 30. When it is desired to select n multiplication frequencies to be selected, n sets of matching circuits 31 are configured as shown in FIG. 5, and the switching signal SWx of the circuit configured to obtain a different desired predetermined multiplication frequency is set to H level. do it. Thus, by increasing the number of matching circuits 30 and the number of switching signals, it is possible to easily cope with an arbitrary number of frequency groups. Further, since the filter is configured by a combination of components of the switching matching circuit 30, there is also an effect of suppressing unnecessary waves. In the example of FIG. 2, the coil L1 and the capacitor C12 constitute a band elimination filter.
[0017]
As described above, according to the present embodiment, by providing the switching matching circuit, it is possible to eliminate the frequency multiplying circuit and the switch, which have been conventionally required, and to greatly reduce the power consumption and circuit components, and also to the switching matching circuit. Since a filter can be configured by combining these parts, there is also an effect of suppressing unnecessary waves.
[0018]
【The invention's effect】
As described above, according to the present invention, the following excellent effects can be obtained.
1. By providing the switching matching circuit, it is possible to reduce the frequency multiplying circuit and the switch, which have been conventionally required, and to greatly reduce power consumption and circuit components.
2. Since the filter can be configured by combining each component of the switching matching circuit, there is an effect of suppressing unnecessary waves.
3. Any number of frequency groups can be easily handled simply by increasing the switching signal of the switching matching circuit.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a multiband radio transceiver according to an embodiment of the present invention.
FIG. 2 is a circuit diagram of an amplifier with a switching matching circuit according to the present invention.
FIG. 3 is a block diagram showing a configuration of a conventional multiband wireless transceiver.
FIG. 4 is a circuit diagram of a conventional amplifier.
FIG. 5 is a circuit diagram of an amplifier with a switching matching circuit of the present invention that can output two or more types of multiplication frequencies.
[Explanation of symbols]
1: antenna 2: duplexer 3: first band duplexer 2: second band duplexer 5: first band high frequency amplifier 6: second band high frequency amplifier 7: first band pass filter 8: first 2-band pass filter 9: reception mixer 10: intermediate frequency filter 11: intermediate frequency amplifier 12: demodulator 13: reception second local oscillator 14: first local oscillator 15: buffer amplifier 16: frequency multiplication circuit 17: switch 18 : Second local oscillator for transmission 19: modulator 20: mixer for transmission 21: preamplifier for first band 22: preamplifier for second band 23: first bandpass filter 24: second bandpass filter 25: first band power amplifier 26: second band power amplifier 27: first band isolator 28: second band isolator 29: signal processing unit 30: switching matching Road 31: switching the matching circuit 32: switching the matching circuit 1
33: switching matching circuit 2
34: switching matching circuit x
35: switching matching circuit n

Claims (5)

２つ以上の異なる周波数で送信動作が可能なマルチ周波数無線送信機において、
送信周波数へのアップコンバージョン用またはベースバンドの変調用の局部発振回路と、
前記局部発振回路の出力を増幅する増幅器と、
前記増幅器からの出力とグランドとの間に接続されて、当該出力の整合状態を、切替信号により高周波的にオープンな状態にするか否か切り替えて整合させる周波数を切り替えることにより、前記局部発振回路の出力周波数の所定の逓倍周波数を選択的に出力する切替整合回路とを有する
ことを特徴とするマルチ周波数無線送信機。In a multi-frequency radio transmitter capable of transmitting at two or more different frequencies,
A local oscillation circuit for up-conversion to the transmission frequency or baseband modulation;
An amplifier for amplifying the output of the local oscillation circuit;
The local oscillation circuit is connected between the output from the amplifier and the ground, and the matching state of the output is switched by switching whether or not to make the matching state of the output high-frequency by a switching signal. And a switching matching circuit that selectively outputs a predetermined frequency multiplied by the output frequency of the multi-frequency radio transmitter. ２つ以上の異なる周波数で受信動作が可能なマルチ周波数無線受信機において、
受信周波数からのダウンコンバージョン用または復調用局部発振回路と、
前記局部発振回路の出力を増幅する増幅器と、
前記増幅器からの出力とグランドとの間に接続されて、当該出力の整合状態を、切替信号により高周波的にオープンな状態にするか否か切り替えて整合させる周波数を切り替えることにより、前記局部発振回路の出力周波数の所定の逓倍周波数を選択的に出力する切替整合回路を有する
ことを特徴とするマルチ周波数無線受信機。In a multi-frequency radio receiver capable of receiving operation at two or more different frequencies,
A local oscillation circuit for down-conversion or demodulation from the reception frequency, and
An amplifier for amplifying the output of the local oscillation circuit;
The local oscillation circuit is connected between the output from the amplifier and the ground, and the matching state of the output is switched by switching whether or not to make the matching state of the output high-frequency by a switching signal. A multi-frequency radio receiver comprising a switching matching circuit that selectively outputs a predetermined frequency multiplied by a predetermined frequency of the output. ２つ以上の異なる周波数で送受信動作が可能なマルチ周波数無線送受信機において、
送信周波数へのアップコンバージョン用またはベースバンドの変調用であって且つ受信周波数からのダウンコンバージョン用または復調用の送信受信共用の局部発振回路と、
前記局部発振回路の出力を増幅する増幅器と、
前記増幅器からの出力とグランドとの間に接続されて、当該出力の整合状態を、切替信号により高周波的にオープンな状態にするか否か切り替えて整合させる周波数を切り替えることにより、前記局部発振回路の出力周波数の所定の逓倍周波数を選択的に出力する切替整合回路を有する
ことを特徴とするマルチ周波数無線送受信機。In a multi-frequency radio transceiver capable of transmitting and receiving at two or more different frequencies,
A local oscillation circuit for use in transmission / reception for up-conversion to a transmission frequency or baseband modulation and for down-conversion or demodulation from a reception frequency;
An amplifier for amplifying the output of the local oscillation circuit;
The local oscillation circuit is connected between the output from the amplifier and the ground, and the matching state of the output is switched by switching whether or not to make the matching state of the output high-frequency by a switching signal. A multi-frequency radio transceiver comprising a switching matching circuit that selectively outputs a predetermined frequency multiplied by an output frequency of the first frequency. 前記切替整合回路は、前記増幅器出力とグランド間に直列接続されるコイルおよびコンデンサと、当該コイルおよびコンデンサをグランドに対してオン状態とするか否かを前記切り替え信号により切り替えるダイオードとを備え、前記オン状態では前記増幅器出力に対するフィルタを構成する
ことを特徴とする請求項１から３のいずれか一項に記載のマルチ周波数無線送信機。The switching matching circuit includes a coil and a capacitor connected in series between the amplifier output and the ground, and a diode that switches whether the coil and the capacitor are turned on with respect to the ground by the switching signal, The multi-frequency radio transmitter according to any one of claims 1 to 3, wherein a filter for the amplifier output is configured in an on state. 前記増幅器に前記切替整合回路を複数段備え、それぞれの切替整合回路に入力する切り替え信号を切り替えることにより、複数種の逓倍周波数を選択可能とした
ことを特徴とする請求項１から４のいずれか一項に記載のマルチ周波数無線送信機。5. The amplifier according to any one of claims 1 to 4, wherein the amplifier includes a plurality of stages of the switching matching circuits, and a plurality of types of multiplication frequencies can be selected by switching a switching signal input to each switching matching circuit. The multi-frequency radio transmitter according to one item.
JP2002346085A 2002-11-28 2002-11-28 Multi-frequency radio transmitter and receiver Expired - Fee Related JP4146712B2 (en)

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US20060063494A1 (en) * 2004-10-04 2006-03-23 Xiangdon Zhang Remote front-end for a multi-antenna station
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