JPH1198050A - Radio circuit - Google Patents
Radio circuitInfo
- Publication number
- JPH1198050A JPH1198050A JP9259103A JP25910397A JPH1198050A JP H1198050 A JPH1198050 A JP H1198050A JP 9259103 A JP9259103 A JP 9259103A JP 25910397 A JP25910397 A JP 25910397A JP H1198050 A JPH1198050 A JP H1198050A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- signal
- reception
- output
- local oscillator
- 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.)
- Withdrawn
Links
Landscapes
- Transceivers (AREA)
- Superheterodyne Receivers (AREA)
Abstract
Description
【０００１】[0001]
【発明属する技術分野】本発明は、主として複数の周波
数チャネルを有する無線システムに用いる無線回路で、
特に高速に周波数チャネルを切り換える機能を有する無
線回路に関する。The present invention relates to a radio circuit mainly used for a radio system having a plurality of frequency channels,
In particular, the present invention relates to a wireless circuit having a function of switching a frequency channel at high speed.
【０００２】[0002]
【従来の技術】近年、移動体通信ではデジタル方式が主
流となってきている。デジタル方式においては通信を行
っていない空き時間に周波数チャネルを切り換える必要
がある。無線機の使用する周波数は無線回路に含まれる
局部発振回路によって選択される。局部発振回路には通
常ＰＬＬ周波数シンセサイザが用いられる。空き時間が
短い場合は高速な周波数切り換えが要求される。しか
し、周波数切り換え時間を短くすると隣接チャネルにお
ける位相雑音が大きくなり、送信時または受信時の性能
が劣化してしまう。また、ＰＬＬ周波数シンセサイザ自
身の高速化にも限界がある。そこで、２つの局部発振器
を交互に切り換える手法がよく用いられる。以下に図面
を参照しながら、従来の無線回路の一例について説明す
る。2. Description of the Related Art In recent years, digital systems have become mainstream in mobile communications. In the digital system, it is necessary to switch frequency channels during idle time when communication is not being performed. The frequency used by the radio is selected by a local oscillation circuit included in the radio circuit. A PLL frequency synthesizer is usually used for the local oscillation circuit. If the idle time is short, high-speed frequency switching is required. However, if the frequency switching time is shortened, the phase noise in the adjacent channel increases, and the performance at the time of transmission or reception deteriorates. In addition, there is a limit to the speedup of the PLL frequency synthesizer itself. Therefore, a technique of alternately switching between two local oscillators is often used. Hereinafter, an example of a conventional wireless circuit will be described with reference to the drawings.
【０００３】図５は従来の無線回路の構成を示すもので
ある。図５において、５１は第１ＲＦ局部発振器、５２
は第２ＲＦ局部発振器、５３は局部発振器選択スイッ
チ、５４はＩＦ局部発振器、５５は送信周波数変換器、
５６は変調器、５７は第１受信周波数変換器、５８は第
２受信周波数変換器、５９は共用器、６０はアンテナ、
６１は送信増幅器、６２は受信増幅器である。送信周波
数変換器５５と変調器５６と送信増幅器６１が送信回路
６３を構成し、第１受信周波数変換器５７と第２受信周
波数変換器と受信増幅器６２が受信回路６４を構成す
る。FIG. 5 shows a configuration of a conventional radio circuit. In FIG. 5, reference numeral 51 denotes a first RF local oscillator;
Is a second RF local oscillator, 53 is a local oscillator selection switch, 54 is an IF local oscillator, 55 is a transmission frequency converter,
56 is a modulator, 57 is a first reception frequency converter, 58 is a second reception frequency converter, 59 is a duplexer, 60 is an antenna,
61 is a transmitting amplifier, and 62 is a receiving amplifier. The transmission frequency converter 55, the modulator 56, and the transmission amplifier 61 form a transmission circuit 63, and the first reception frequency converter 57, the second reception frequency converter, and the reception amplifier 62 form a reception circuit 64.
【０００４】局部発振器選択スイッチ５３は第１ＲＦ局
部発振器５１と第２ＲＦ局部発振器２のいずれか一方の
出力信号を選択して出力する。送信時は、変調器５６は
変調信号でＩＦ局部発振器５４の出力信号を変調し、送
信中間周波数信号を出力する。送信中間周波数信号は送
信周波数変換器５５で局部発振器選択スイッチ５３の出
力信号によって送信周波数に変換され、送信増幅器６１
で増幅され、共用器５９を通ってアンテナ６０から送信
される。受信時は、アンテナ６０で受信された受信信号
は共用器５９を通って受信増幅器６２で増幅される。増
幅された受信信号は第１受信周波数変換器５７に入力さ
れ、局部発振器選択スイッチ５３の出力によって第１受
信中間周波数信号に周波数変換される。第１受信中間周
波数信号は第２受信周波数変換器で第３局部発振器の出
力によって第２受信中間周波数信号に変換される。The local oscillator selection switch 53 selects and outputs one of the output signals of the first RF local oscillator 51 and the second RF local oscillator 2. At the time of transmission, the modulator 56 modulates the output signal of the IF local oscillator 54 with the modulation signal and outputs a transmission intermediate frequency signal. The transmission intermediate frequency signal is converted to a transmission frequency by the output signal of the local oscillator selection switch 53 by the transmission frequency converter 55, and the transmission amplifier 61
, And transmitted from the antenna 60 through the duplexer 59. At the time of reception, the reception signal received by the antenna 60 passes through the duplexer 59 and is amplified by the reception amplifier 62. The amplified reception signal is input to the first reception frequency converter 57 and frequency-converted to the first reception intermediate frequency signal by the output of the local oscillator selection switch 53. The first received intermediate frequency signal is converted into a second received intermediate frequency signal by an output of a third local oscillator in a second received frequency converter.
【０００５】第１ＲＦ局部発振器５１、第２ＲＦ局部発
振器５２はＰＬＬ周波数シンセサイザで構成される。通
常、ＰＬＬ周波数シンセサイザでは周波数切り換え時間
を短くすると位相雑音が大きくなって送信または受信の
性能が劣化するため、周波数切り換え時間を十分に短く
することができない。そこで、周波数チャネルを切り換
える場合、局部発振器選択スイッチ５３で第１ＲＦ局部
発振器５１の出力周波数を選択している間に、第２ＲＦ
局部発振器５２の出力周波数を次に使用する予定の周波
数に切り換えておく。そして、周波数チャネルを切り換
えるときに局部発振器選択スイッチ５３で第２ＲＦ局部
発振器５２を選択することで、無線機として高速に周波
数を切り換える。[0005] The first RF local oscillator 51 and the second RF local oscillator 52 are constituted by PLL frequency synthesizers. Normally, in a PLL frequency synthesizer, if the frequency switching time is shortened, phase noise increases and transmission or reception performance deteriorates, so that the frequency switching time cannot be shortened sufficiently. Therefore, when switching the frequency channel, while the output frequency of the first RF local oscillator 51 is selected by the local oscillator selection switch 53, the second RF
The output frequency of the local oscillator 52 is switched to the frequency to be used next. Then, when switching the frequency channel, the local oscillator selection switch 53 selects the second RF local oscillator 52, thereby switching the frequency as a wireless device at high speed.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら上記のよ
うな構成では、第１ＲＦ局部発振器５１と第２ＲＦ局部
発振器５２が近接した周波数で動作する。局部発振器選
択スイッチ５３が選択していない方の出力信号は選択し
ている信号に対する妨害となるため、送信信号にスプリ
アスが発生しやすく、受信信号に対しても妨害を与えや
すいという問題点を有していた。However, in the above configuration, the first RF local oscillator 51 and the second RF local oscillator 52 operate at close frequencies. Since the output signal that is not selected by the local oscillator selection switch 53 interferes with the selected signal, there is a problem that spurious signals are liable to occur in the transmission signal and interference is likely to occur in the reception signal. Was.
【０００７】本発明は上記従来の無線回路の課題に鑑
み、小型化に適し、余分なスプリアスが発生しない無線
回路を提供することを目的とする。The present invention has been made in view of the above-mentioned problems of the conventional radio circuit, and has as its object to provide a radio circuit which is suitable for miniaturization and does not generate extra spurious.
【０００８】[0008]
【課題を解決するための手段】上記課題を解決するため
に、本発明の無線回路は、たとえば、高速な周波数切り
換えが可能だが位相雑音の大きなＰＬＬ周波数シンセサ
イザである第１局部発振器の出力信号を分周し、出力周
波数が固定で位相雑音の小さな第２局部発振器と周波数
混合して両者の和または差の周波数の信号を局部信号に
用いるという構成を備えたものである。In order to solve the above problems, a radio circuit according to the present invention uses, for example, an output signal of a first local oscillator which is a PLL frequency synthesizer capable of high-speed frequency switching but having large phase noise. The frequency divider is frequency-mixed with a second local oscillator having a fixed output frequency and a small phase noise, and a signal having a sum or difference frequency is used as a local signal.
【０００９】[0009]
【発明の実施の形態】以下本発明の一実施の形態の無線
回路について、図面を参照しながら説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A radio circuit according to an embodiment of the present invention will be described below with reference to the drawings.
【００１０】図１は本発明の実施の形態における無線回
路の構成を示すものである。図１において、１は第１局
部発振器、２は第１分周器、３は第２局部発振器、４は
局部周波数変換器、５は第２分周器、６は送信周波数変
換器、７は変調器、８は第１受信周波数変換器、９は第
２受信周波数変換器、１０は共用器、１１はアンテナ、
１２は送信増幅器、１３は受信増幅器である。変調器
７、送信周波数変換器６、送信増幅器１２は送信回路２
０を構成し、受信増幅器１３、第１受信周波数変換器
８、第２受信周波数変換器９は受信回路２１を構成す
る。FIG. 1 shows a configuration of a radio circuit according to an embodiment of the present invention. In FIG. 1, 1 is a first local oscillator, 2 is a first frequency divider, 3 is a second local oscillator, 4 is a local frequency converter, 5 is a second frequency divider, 6 is a transmission frequency converter, 7 is A modulator, 8 is a first reception frequency converter, 9 is a second reception frequency converter, 10 is a duplexer, 11 is an antenna,
Reference numeral 12 denotes a transmission amplifier, and 13 denotes a reception amplifier. The modulator 7, the transmission frequency converter 6, and the transmission amplifier 12 are connected to the transmission circuit 2
0, the receiving amplifier 13, the first receiving frequency converter 8, and the second receiving frequency converter 9 form a receiving circuit 21.
【００１１】第１局部発振器１の出力は第１分周器２で
分周され、局部周波数変換器４に入力する。第１局部発
振器１の出力周波数を変化させることにより、無線回路
で使用する周波数チャネルを変更する。第２局部発振器
３の出力は局部周波数変換器４と第２分周器５に入力す
る。局部周波数変換器４は分周器２の出力周波数と第２
局部発振器３の出力周波数の和の周波数の信号を、送信
周波数変換器と第１受信周波数変換器８に出力する。第
２分周器５は第２局部発振器３の出力信号を分周して変
調器７と第２受信周波数変換器９に出力する。The output of the first local oscillator 1 is divided by the first frequency divider 2 and input to the local frequency converter 4. By changing the output frequency of the first local oscillator 1, the frequency channel used in the radio circuit is changed. The output of the second local oscillator 3 is input to a local frequency converter 4 and a second frequency divider 5. The local frequency converter 4 determines the output frequency of the frequency divider 2 and the second
A signal having the sum of the output frequencies of the local oscillators 3 is output to the transmission frequency converter and the first reception frequency converter 8. The second frequency divider 5 divides the frequency of the output signal of the second local oscillator 3 and outputs it to the modulator 7 and the second reception frequency converter 9.
【００１２】変調器７は第２分周器５から入力された信
号を変調信号で変調し、送信中間周波数信号を出力す
る。送信中間周波数信号は送信周波数変換器６に入力
し、局部周波数変換器４の出力信号によって送信周波数
の信号に周波数変換され、送信増幅器１２によって増幅
され、共用器１０を通ってアンテナ１１より送信され
る。The modulator 7 modulates the signal input from the second frequency divider 5 with a modulation signal and outputs a transmission intermediate frequency signal. The transmission intermediate frequency signal is input to the transmission frequency converter 6, frequency-converted to a signal of the transmission frequency by the output signal of the local frequency converter 4, amplified by the transmission amplifier 12, transmitted through the duplexer 10, and transmitted from the antenna 11. You.
【００１３】他方、アンテナ１１で受信された受信信号
は共用器１０を通って受信増幅器１３で増幅され、第１
受信周波数変換器８で局部周波数変換器４の出力信号に
よって第１受信中間周波数の信号に変換される。第１受
信中間周波数に変換された信号は第２受信周波数変換器
９に入力し、第２分周器５の出力信号によって第２受信
中間周波数の信号に復調される。On the other hand, the received signal received by the antenna 11 passes through the duplexer 10 and is amplified by the
The reception frequency converter 8 converts the output signal of the local frequency converter 4 into a signal of the first reception intermediate frequency. The signal converted to the first reception intermediate frequency is input to the second reception frequency converter 9 and demodulated by the output signal of the second frequency divider 5 into a signal of the second reception intermediate frequency.
【００１４】ところで、第１局部発振器１はＰＬＬ周波
数シンセサイザであり、送信および受信を行っていない
短い時間で周波数切り換えを行う。所望する高速に周波
数を切り換えるために、ループ帯域幅を広くし、隣接す
る周波数チャネルにおける位相雑音が、送信回路２０ま
たは受信回路２１で必要な位相雑音よりも大きい。これ
を第１分周器２で分周することで、位相雑音を小さくす
る。Incidentally, the first local oscillator 1 is a PLL frequency synthesizer, and performs frequency switching in a short time during which transmission and reception are not performed. In order to switch the frequency at a desired high speed, the loop bandwidth is widened, and the phase noise in the adjacent frequency channel is larger than the phase noise required in the transmission circuit 20 or the reception circuit 21. By dividing the frequency by the first frequency divider 2, the phase noise is reduced.
【００１５】図２は第１局部発振器１の位相雑音、第１
分周器２の出力信号の位相雑音、および送信または受信
回路で所望される隣接チャネルにおける位相雑音を示
す。図２は第１分周器２の分周数が４の場合の例を示
す。分周により約１２ｄＢ位相雑音が小さくなり、送信
回路２０または受信回路２１で所望される位相雑音より
小さい。一方、第２局部発振器３は出力周波数が固定で
あるため、ＰＬＬ周波数シンセサイザで構成してもルー
プ帯域幅が小さく、位相雑音は十分に小さい。よって、
第１分周器２の出力と第２局部発振器の出力を局部周波
数変換器４で周波数混合した出力の位相雑音を小さくで
きる。FIG. 2 shows the phase noise of the first local oscillator 1,
3 shows the phase noise of the output signal of the frequency divider 2 and the phase noise in an adjacent channel desired by the transmission or reception circuit. FIG. 2 shows an example in which the frequency division number of the first frequency divider 2 is four. The division reduces the phase noise by about 12 dB, which is smaller than the phase noise desired by the transmission circuit 20 or the reception circuit 21. On the other hand, since the second local oscillator 3 has a fixed output frequency, the loop bandwidth is small and the phase noise is sufficiently small even if it is configured with a PLL frequency synthesizer. Therefore,
The phase noise of the output obtained by frequency-mixing the output of the first frequency divider 2 and the output of the second local oscillator by the local frequency converter 4 can be reduced.
【００１６】以上のように本実施の形態によれば、高速
に周波数切り換え可能だが位相雑音の大きな第１局部発
振器の出力を分周し、位相雑音の小さな出力周波数固定
の第２局部発振器と周波数混合した信号を送信回路また
は受信回路の局部信号に用いることにより、所望の位相
雑音を満たしながら高速な周波数切り換えが可能とな
る。さらに、第２局部発振器３の出力を分周した信号を
変調器７と第２受信周波数変換器９に入力することによ
り、発振周波数が近接しない２つの局部発振器１，３で
無線回路を実現することができる。これにより、スプリ
アスが少なく、高速に周波数切り換えが可能で小型の無
線回路を実現できる。As described above, according to the present embodiment, the frequency of the output of the first local oscillator whose frequency can be switched at high speed but whose phase noise is large is divided, and the output of the second local oscillator whose output frequency is fixed and whose phase noise is small is fixed. By using the mixed signal as a local signal of the transmission circuit or the reception circuit, high-speed frequency switching can be performed while satisfying desired phase noise. Further, by inputting a signal obtained by dividing the output of the second local oscillator 3 to the modulator 7 and the second reception frequency converter 9, a radio circuit is realized by the two local oscillators 1, 3 whose oscillation frequencies are not close to each other. be able to. As a result, a small wireless circuit with less spurious, capable of high-speed frequency switching, can be realized.
【００１７】なお、本実施の形態では第２受信中間周波
数を用いる構成としたが、図３に示すように、第１受信
中間周波数で復調する構成に適用してもよいことはいう
までもない。この場合、第２分周器５の出力は第２受信
周波数変換器９のかわりに復調器１４に入力され、第１
受信中間周波数の信号をベースバンド信号に復調する。Although the present embodiment employs the configuration using the second reception intermediate frequency, it goes without saying that the present invention may be applied to a configuration in which demodulation is performed at the first reception intermediate frequency as shown in FIG. . In this case, the output of the second frequency divider 5 is input to the demodulator 14 instead of the second reception frequency converter 9, and
The signal of the reception intermediate frequency is demodulated into a baseband signal.
【００１８】また、送信時と受信時で第１局部発振器の
出力周波数が異なる構成とすれば、送信中間周波数、第
１受信中間周波数、第２受信中間周波数の組み合わせの
自由度が高くなり、無線回路の周波数設計が容易とな
る。If the output frequency of the first local oscillator is different between transmission and reception, the degree of freedom of the combination of the transmission intermediate frequency, the first reception intermediate frequency, and the second reception intermediate frequency is increased, and The frequency design of the circuit becomes easy.
【００１９】さらにまた、第２局部発振器３を図４に示
す構成とすることができる。図４において、水晶発振器
１５の出力はてい倍器１６によっててい倍され、帯域通
過フィルタ１７によって所望の周波数成分のみ選択され
て出力される。これにより、無線回路の小型化が容易と
なる。Furthermore, the second local oscillator 3 can be configured as shown in FIG. In FIG. 4, the output of the crystal oscillator 15 is multiplied by a multiplier 16 and only a desired frequency component is selected and output by a bandpass filter 17. This facilitates miniaturization of the wireless circuit.
【００２０】さらにまた、第２分周器５が送信回路２０
および受信回路２１に対してそれぞれ異なる分周数で分
周した信号を出力する構成としてもよいことはいうまで
もない。Further, the second frequency divider 5 includes a transmitting circuit 20
Needless to say, the configuration may be such that signals divided by different division numbers are output to the reception circuit 21.
【００２１】[0021]
【発明の効果】以上説明したように本発明は、小型化に
適し、余分なスプリアスが発生しない無線回路を実現す
ることができる。As described above, the present invention can realize a radio circuit which is suitable for miniaturization and does not generate extra spurious.
【図１】本発明の第１の実施の形態における無線回路の
構成図である。FIG. 1 is a configuration diagram of a wireless circuit according to a first embodiment of the present invention.
【図２】本発明の第１の実施の形態における無線回路の
第１局部発振器の出力信号の位相雑音、第１分周器の出
力信号の位相雑音、受信回路で所望される位相雑音の関
係を示す特性図である。FIG. 2 shows a relationship between a phase noise of an output signal of a first local oscillator, a phase noise of an output signal of a first frequency divider, and a desired phase noise of a receiving circuit in the wireless circuit according to the first embodiment of the present invention. FIG.
【図３】本発明の第１の実施の形態における無線回路の
受信回路の別の構成例を示す構成図である。FIG. 3 is a configuration diagram illustrating another configuration example of the reception circuit of the wireless circuit according to the first embodiment of the present invention.
【図４】本発明の第１の実施の形態における無線回路の
で、第２局部発振器の別の構成例を示す構成図である。FIG. 4 is a configuration diagram showing another configuration example of the second local oscillator in the radio circuit according to the first embodiment of the present invention.
【図５】従来の無線回路の構成図である。FIG. 5 is a configuration diagram of a conventional wireless circuit.
１ 第１局部発振器 ２ 第１分周器 ３ 第２局部発振器 ４ 局部周波数変換器 ５ 第２分周器 ６、５５ 送信周波数変換器 ７、５６ 変調器 ８、５７ 第１受信周波数変換器 ９、５８ 第２受信周波数変換器 １０、５９ 共用器 １１、６０ アンテナ １２、６１ 送信増幅器 １３、６２ 受信増幅器 １４ 復調器 １５ 水晶発振器 １６ てい倍器 １７ 帯域通過フィルタ ２０、６３ 送信回路 ２１、６４ 受信回路 ５１ 第１ＲＦ局部発振器 ５２ 第２ＲＦ局部発振器 ５３ 局部発振器選択スイッチ ５４ ＩＦ局部発振器 Reference Signs List 1 first local oscillator 2 first frequency divider 3 second local oscillator 4 local frequency converter 5 second frequency divider 6, 55 transmission frequency converter 7, 56 modulator 8, 57 first reception frequency converter 9, 58 second reception frequency converter 10, 59 duplexer 11, 60 antenna 12, 61 transmission amplifier 13, 62 reception amplifier 14 demodulator 15 crystal oscillator 16 multiplier 17 band-pass filter 20, 63 transmission circuit 21, 64 reception circuit 51 first RF local oscillator 52 second RF local oscillator 53 local oscillator selection switch 54 IF local oscillator
フロントページの続き (72)発明者 平野 俊介 神奈川県横浜市港北区綱島東四丁目３番１ 号 松下通信工業株式会社内 (72)発明者 春木 宏志 神奈川県横浜市港北区綱島東四丁目３番１ 号 松下通信工業株式会社内Continuation of the front page (72) Inventor Shunsuke Hirano 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Inside Matsushita Communication Industrial Co., Ltd. (72) Inventor Hiroshi Haruki 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama, Kanagawa Prefecture No. 1 Matsushita Communication Industrial Co., Ltd.
Claims (8)
する第１分周器と、第２局部発振器と、前記第１分周器
の出力信号と前記第２局部発振器の出力信号を入力し、
その入力された２つの信号周波数の和または差のいずれ
かの周波数の信号を出力する局部周波数変換器と、その
局部周波数変換器に接続された送信回路及び／又は受信
回路とを備え、前記第１局部発振器の出力周波数を変化
させることにより無線の周波数チャネルを選択すること
を特徴とする無線回路。1. A first local oscillator, a first frequency divider for dividing an output signal thereof, a second local oscillator, and an output signal of the first frequency divider and an output signal of the second local oscillator. Input,
A local frequency converter that outputs a signal having a frequency of either the sum or difference of the two input signal frequencies; and a transmitting circuit and / or a receiving circuit connected to the local frequency converter, 1. A radio circuit, wherein a radio frequency channel is selected by changing an output frequency of a local oscillator.
セサイザであり、その出力の位相雑音は前記送信回路ま
たは前記受信回路で所望される位相雑音よりも大きく、
前記第１分周器の出力の位相雑音は前記送信回路または
前記受信回路で所望される位相雑音よりも小さいことを
特徴とする請求項１記載の無線回路。2. The first local oscillator is a PLL frequency synthesizer, the output phase noise of which is greater than the phase noise desired by the transmitting circuit or the receiving circuit,
2. The radio circuit according to claim 1, wherein a phase noise of an output of the first frequency divider is smaller than a phase noise desired by the transmission circuit or the reception circuit.
り、送信時と受信時で前記第１局部発振器の出力周波数
が変化することにより送信周波数および受信周波数を選
択することを特徴とする請求項１又は２記載の無線回
路。3. The output frequency of the second local oscillator is fixed, and the transmission frequency and the reception frequency are selected by changing the output frequency of the first local oscillator between transmission and reception. Item 3. The wireless circuit according to item 1 or 2.
備え、前記第２局部発振器の出力信号は前記局部周波数
変換器に入力されるとともに第２分周器に入力され分周
された後に前記変調器に入力され、前記変調器は送信中
間周波数の信号を前記送信周波数変換器に出力し、前記
送信周波数変換器は前記送信中間周波数の信号を前記局
部周波数変換器の出力信号によって送信周波数に変換す
ることを特徴とする請求項１から３のいずれかに記載の
無線回路。4. A transmitting circuit includes a transmitting frequency converter and a modulator, and an output signal of the second local oscillator is input to the local frequency converter and is input to a second frequency divider and frequency-divided. Input to the modulator, the modulator outputs a signal of a transmission intermediate frequency to the transmission frequency converter, and the transmission frequency converter converts the signal of the transmission intermediate frequency to a transmission frequency by an output signal of the local frequency converter. The wireless circuit according to claim 1, wherein the conversion is performed to:
器を備え、受信信号は前記第１受信周波数変換器に入力
され、前記局部周波数変換器の出力信号によって第１受
信中間周波数の信号に変換された後に前記復調器に入力
され、前記第２局部発振器の出力信号は前記局部周波数
変換器に入力されるとともに第２分周器に入力され分周
された後に前記復調器に入力され、第１受信中間周波数
の信号を復調することを特徴とする請求項１から４のい
ずれかに記載の無線回路。5. A receiving circuit comprising a first receiving frequency converter and a demodulator, wherein a receiving signal is input to the first receiving frequency converter, and a signal of a first receiving intermediate frequency is output from the local frequency converter. Is input to the demodulator, and the output signal of the second local oscillator is input to the local frequency converter and input to the second frequency divider and frequency-divided, and then input to the demodulator. 5. The radio circuit according to claim 1, wherein a signal of the first reception intermediate frequency is demodulated.
受信周波数変換器を備え、受信信号は前記第１受信周波
数変換器に入力され、前記局部周波数変換器の出力信号
によって第１受信中間周波数の信号に変換された後に前
記第２受信周波数変換器に入力され、前記第２局部発振
器の出力信号は前記局部周波数変換器に入力されるとと
もに前記第２受信周波数変換器に入力されて第１受信中
間周波数の信号を第２受信中間周波数の信号に変換する
ことを特徴とする請求項１から４のいずれかに記載の無
線回路。6. A receiving circuit comprising a first receiving frequency converter and a second receiving frequency converter.
A reception frequency converter, wherein a reception signal is input to the first reception frequency converter and is converted to a signal of a first reception intermediate frequency by an output signal of the local frequency converter, and then is converted to a signal of the second reception frequency converter. The output signal of the second local oscillator is input to the local frequency converter and is also input to the second reception frequency converter to convert the signal of the first reception intermediate frequency into a signal of the second reception intermediate frequency. The wireless circuit according to any one of claims 1 to 4, wherein:
第２分周器は前記送信回路と受信回路に異なる分周数で
分周した信号を出力することを特徴とする請求項５又は
６記載の無線回路。7. The semiconductor device according to claim 5, further comprising a transmitting circuit and a receiving circuit, wherein the second frequency divider outputs signals divided by different frequency to the transmitting circuit and the receiving circuit. 6. The wireless circuit according to 6.
い倍して出力する構成であることを特徴とする請求項１
から７のいずれかに記載の無線回路。8. The apparatus according to claim 1, wherein the second local oscillator is configured to multiply and output the output of the crystal oscillator.
8. The wireless circuit according to any one of claims 1 to 7.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9259103A JPH1198050A (en) | 1997-09-24 | 1997-09-24 | Radio circuit |
| EP98117394A EP0903860A1 (en) | 1997-09-17 | 1998-09-14 | PLL frequency synthesizer |
| CNB981195075A CN1134109C (en) | 1997-09-17 | 1998-09-16 | Phase-locked loop frequency synthesizer |
| US09/154,740 US6441692B1 (en) | 1997-09-17 | 1998-09-17 | PLL frequency synthesizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9259103A JPH1198050A (en) | 1997-09-24 | 1997-09-24 | Radio circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1198050A true JPH1198050A (en) | 1999-04-09 |
Family
ID=17329374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9259103A Withdrawn JPH1198050A (en) | 1997-09-17 | 1997-09-24 | Radio circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1198050A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002069512A1 (en) * | 2001-02-26 | 2002-09-06 | Mitsubishi Denki Kabushiki Kaisha | Frequency converter and communication device |
| JP2007259211A (en) * | 2006-03-24 | 2007-10-04 | Nec Corp | Local oscillator and radio transceiver using it |
-
1997
- 1997-09-24 JP JP9259103A patent/JPH1198050A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002069512A1 (en) * | 2001-02-26 | 2002-09-06 | Mitsubishi Denki Kabushiki Kaisha | Frequency converter and communication device |
| US6968159B2 (en) | 2001-02-26 | 2005-11-22 | Mitsubishi Denki Kabushiki Kaisha | Frequency converter and communication device |
| JP2007259211A (en) * | 2006-03-24 | 2007-10-04 | Nec Corp | Local oscillator and radio transceiver using it |
| JP2011139545A (en) * | 2006-03-24 | 2011-07-14 | Nec Corp | Local oscillation apparatus and radio transceiver employing the same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5734970A (en) | Single oscillator transceiver with multiple frequency converters | |
| US5983081A (en) | Method for generating frequencies in a direct conversion transceiver of a dual band radio communication system, a direct conversion transceiver of a dual band radio communication system and the use of this method and apparatus in a mobile station | |
| US6201952B1 (en) | Radio communication apparatus | |
| US5825813A (en) | Transceiver signal processor for digital cordless communication apparatus | |
| JPH1032520A (en) | Transmitter-receiver sending/receiving radio frequency signal for two frequency bands | |
| US6816021B2 (en) | Multiple band local oscillator frequency generation circuit | |
| JPH09219664A (en) | Radio transmitter-receiver | |
| KR19990078108A (en) | Dual band mobile phone handset | |
| US5307378A (en) | Digital radio communication apparatus | |
| JPH1098409A (en) | Radio circuit | |
| JP3309904B2 (en) | Wireless transceiver | |
| US5924021A (en) | Frequency conversion circuit and method for millimeter wave radio | |
| JP3369480B2 (en) | Wireless circuit device | |
| JPH1022852A (en) | Radio communication equipment | |
| US6021164A (en) | Digital radio communication system having reduced phase-locked loop, and its synchronization | |
| JP3828077B2 (en) | Frequency conversion circuit and communication device | |
| JPH1093475A (en) | Composite system shared terminal equipment | |
| JPH1198050A (en) | Radio circuit | |
| JP3464147B2 (en) | Transceiver | |
| JP3282682B2 (en) | Mobile phone | |
| JP2001086024A (en) | Radio circuit and radio communications equipment | |
| US6741865B1 (en) | Digital multi-subscriber radio telecommunication system working with frequency jumping | |
| JP3284666B2 (en) | Time division multiplex digital wireless communication device | |
| JPH05259934A (en) | Transmitting/receiving device | |
| JP3387112B2 (en) | Transmission device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20040726 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20060331 |
|
| A761 | Written withdrawal of application |
Free format text: JAPANESE INTERMEDIATE CODE: A761 Effective date: 20060424 |