JPH08107315A - Frequency converter - Google Patents
Frequency converterInfo
- Publication number
- JPH08107315A JPH08107315A JP24267494A JP24267494A JPH08107315A JP H08107315 A JPH08107315 A JP H08107315A JP 24267494 A JP24267494 A JP 24267494A JP 24267494 A JP24267494 A JP 24267494A JP H08107315 A JPH08107315 A JP H08107315A
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- Japan
- Prior art keywords
- signal
- mixer
- output
- frequency
- phase
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、通信システムにおけ
る送信機または受信機に用いられる二重混合器を用いた
周波数変換装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency converter using a double mixer used as a transmitter or a receiver in a communication system.
【０００２】[0002]
【従来の技術】通信システムの送信機または受信機にお
いて２つの混合機を用いるいわゆるダブルコンバージョ
ンシステムは、同調周波数の選択を容易にするためまた
は、ビート周波数を避ける等の目的のためによく用いら
れる。図７は従来のこうした２つの混合器を用いた周波
数変換装置の構成を示す図である。図は、送信機として
信号をダブルコンバージョンシステムを用いて高周波信
号に変換し出力をする例である。図において、１は入力
の低周波信号である。２は第１の混合器、３は第１の混
合器出力の中間周波数信号、４はろ波フィルタ、５は第
２の混合器、６は第２の混合器出力であり、また周波数
変換装置の出力である高周波信号である。７は第１の位
相同期局部発振器、８は第２の位相同期局部発振器、９
は位相同期局部発振器の基準信号である。１０は第１の
局部信号発振器７の出力信号、１１は第２の局部発振器
８の出力である局部信号である。BACKGROUND OF THE INVENTION So-called double conversion systems, which use two mixers in the transmitter or receiver of a communication system, are often used for the purpose of facilitating the selection of tuning frequencies or for avoiding beat frequencies. . FIG. 7 is a diagram showing the configuration of a conventional frequency converter using such two mixers. The figure shows an example in which a signal is converted into a high-frequency signal and output using a double conversion system as a transmitter. In the figure, 1 is an input low frequency signal. 2 is a first mixer, 3 is an intermediate frequency signal of the first mixer output, 4 is a filtering filter, 5 is a second mixer, 6 is a second mixer output, and It is a high frequency signal that is an output. 7 is a first phase-locked local oscillator, 8 is a second phase-locked local oscillator, 9
Is the reference signal of the phase-locked local oscillator. Reference numeral 10 is an output signal of the first local signal oscillator 7, and 11 is a local signal which is an output of the second local oscillator 8.
【０００３】次に図に示す周波数変換装置の動作を説明
する。第１の混合器２への入力の低周波信号１は、第１
の位相同期局部発振器７の出力である局部信号１０ ｆ
L1と混合し、中間周波数信号３ ｆI2に変換される。そ
の後、ろ波器４を経て第２の変換器５で第２の位相同期
局部発振器８からの局部信号１１ ｆL2と混合し、高周
波信号６ ｆRFに変換されて出力される。高周波信号６
ｆRFは、例えば中間周波信号ｆI2とｆL2との和とな
る。即ち、高周波信号は、入力の低周波信号ｆI1とｆL1
とｆL2の和で表される。Next, the operation of the frequency converter shown in the figure will be described. The low frequency signal 1 at the input to the first mixer 2 is
Of the local signal 10 f which is the output of the phase-locked local oscillator 7 of
It is mixed with L1 and converted into an intermediate frequency signal 3 f I2 . After that, the signal is mixed with the local signal 11 f L2 from the second phase-locked local oscillator 8 by the second converter 5 via the filter 4, converted into the high frequency signal 6 f RF , and output. High frequency signal 6
f RF is, for example, the sum of the intermediate frequency signals f I2 and f L2 . That is, the high frequency signals are the input low frequency signals f I1 and f L1.
And f L2 .
【０００４】図８は、送信機ではなく受信機としてであ
るが、位相同期局部発振器の数を減らして構成を簡単に
した他の従来の周波数変換装置の構成を示す図である。
図において、１８は位相同期局部発振器７の出力をＮ＋
１倍するＮ＋１倍器である。図８の構成の周波数変換装
置の動作は、以下の通りとなる。この場合は、受信機で
あり入力の高周波信号１のｆd が第１の混合器と第２の
混合器３によって、ダウンコンバートされｆI1の中間周
波信号となる。出力の第２の中間周波信号ｆI2は結局ｆ
d −Ｎｆ0 となる。FIG. 8 is a diagram showing the structure of another conventional frequency conversion device which is not a transmitter but a receiver, but has a simplified structure by reducing the number of phase-locked local oscillators.
In the figure, 18 indicates the output of the phase-locked local oscillator 7 as N +
It is an N + 1 multiplier that multiplies by one. The operation of the frequency conversion device configured as shown in FIG. 8 is as follows. In this case, f d of the high frequency signal 1 which is the receiver and is input is down-converted by the first mixer and the second mixer 3 to be an intermediate frequency signal of f I1 . The output second intermediate frequency signal f I2 is eventually f
d- Nf 0 .
【０００５】[0005]
【発明が解決しようとする課題】従来の周波数変換装置
は以上のように構成されているので、例えば送信機のよ
うに高周波信号を出力する場合、その位相雑音は、第１
の位相同期局部発振器の位相雑音と第２の位相同期局部
発振器の位相雑音の和となり、送信機全体の位相雑音を
減らすには、第１の位相同期局部発振器と第２の位相同
期局部発振器の両方の位相雑音を共に低減しなければな
らず、高価で複雑な構成としなければならないという課
題があった。Since the conventional frequency converter is constructed as described above, when a high frequency signal is output as in a transmitter, the phase noise is
The sum of the phase noise of the phase-locked local oscillator and the phase noise of the second phase-locked local oscillator becomes, and in order to reduce the phase noise of the entire transmitter, the first phase-locked local oscillator and the second phase-locked local oscillator are There was a problem that both phase noises had to be reduced, and an expensive and complicated structure had to be made.
【０００６】この発明は上記の課題を解決するためにな
されたもので、比較的簡単な構成で位相雑音の少ない周
波数変換装置を得ることを目的とする。The present invention has been made to solve the above problems, and an object of the present invention is to obtain a frequency conversion device having a relatively simple structure and less phase noise.
【０００７】[0007]
【課題を解決するための手段】この発明に係る周波数変
換装置は、位相同期局部発振器の基準信号を与える基準
信号発生回路と、この基準信号で発振する位相同期局部
発振器と、この位相同期局部発振器出力と入力の低周波
信号を混合し、中間周波信号を得る第１の混合器と、位
相同期局部発振器の出力信号と逓倍した基準信号を混合
して第２の混合器用の局部信号を生成する第３の混合器
と、この第３の混合器出力の局部信号と上記中間周波信
号とを混合して出力の高周波信号を得る第２の混合器と
を備えた。SUMMARY OF THE INVENTION A frequency converter according to the present invention is a reference signal generating circuit for providing a reference signal of a phase-locked local oscillator, a phase-locked local oscillator oscillating with this reference signal, and this phase-locked local oscillator. A first mixer for mixing an output and an input low frequency signal to obtain an intermediate frequency signal is mixed with an output signal of a phase locked local oscillator and a multiplied reference signal to generate a local signal for a second mixer. A third mixer and a second mixer for mixing the local signal output from the third mixer and the intermediate frequency signal to obtain a high frequency signal output are provided.
【０００８】この発明に係る他の周波数変換装置は、基
準信号を与える基準信号発生回路と、この基準信号の周
波数を逓倍する周波数逓倍器と、この基準信号で発振す
る位相同期局部発振器と、位相同期局部発振器の出力信
号と逓倍した基準信号を混合して第２の混合器用の局部
信号を生成する第３の混合器と、入力の高周波信号を上
記第３の混合器の出力の局部信号で混合し、中間周波信
号を得る第２の混合器と、この上記中間周波信号と上記
位相同期局部発振器の出力とを混合して出力の低波信号
を得る第１の混合器とを備えた。Another frequency converter according to the present invention is a reference signal generating circuit for giving a reference signal, a frequency multiplier for multiplying the frequency of the reference signal, a phase-locked local oscillator for oscillating with the reference signal, and a phase A third mixer for mixing the output signal of the synchronous local oscillator and the multiplied reference signal to generate a local signal for the second mixer, and a high frequency signal at the input for the local signal at the output of the third mixer. A second mixer for mixing and obtaining an intermediate frequency signal was provided, and a first mixer for mixing the intermediate frequency signal and the output of the phase locked local oscillator to obtain a low-wave signal of the output.
【０００９】また更に、逓倍器を第１の逓倍器とし、第
１の逓倍器の他に第１の混合器に与える位相同期局部発
振器の出力を逓倍する第２の逓倍器と、第２の混合器に
与える第３の混合器出力を逓倍してその逓倍数を第２の
逓倍器と同一とする第３の逓倍器を備え、第１の混合器
は位相同期局部発振器の出力に代えて第２の逓倍器出力
を局部信号とし、第２の混合器は第３の混合器出力に代
えて第３の逓倍器出力を局部信号として混合するように
した。Furthermore, the multiplier is a first multiplier, and in addition to the first multiplier, a second multiplier for multiplying the output of the phase-locked local oscillator applied to the first mixer, and a second multiplier. A third multiplier for multiplying the output of the third mixer given to the mixer and making the multiplication number the same as that of the second multiplier is provided, and the first mixer replaces the output of the phase-locked local oscillator. The output of the second multiplier is used as a local signal, and the second mixer mixes the output of the third multiplier as a local signal instead of the output of the third mixer.
【００１０】また更に、逓倍器を第１の逓倍器とし、第
１の逓倍器の他に基準信号を第１の逓倍器よりは少ない
数で逓倍する第２の逓倍器と、第２の逓倍器出力と位相
同期局部発振器の出力とを混合して第１の混合器用の局
部信号を得る第４の混合器を備え、第１の混合器は、位
相同期局部発振器の出力に代えて第４の混合器出力の変
調信号で混合するようにした。Further, the multiplier is a first multiplier, and in addition to the first multiplier, a second multiplier for multiplying the reference signal by a smaller number than the first multiplier, and a second multiplier. A fourth mixer for obtaining a local signal for the first mixer by mixing the output of the phase-locked local oscillator with the output of the phase-locked local oscillator, the first mixer having a fourth mixer instead of the output of the phase-locked local oscillator. The modulation signal output from the mixer is used for mixing.
【００１１】[0011]
【作用】この発明による周波数変換装置は、入力の低周
波信号が第１の混合器と第２の混合器で出力の高周波信
号に変換されるが、第１の混合器に入力する位相同期局
部発振器出力との和または差出力と、第２の混合器に入
力する第３の混合器出力の局部信号が含む位相同期局部
発振器出力との差または和出力で位相同期局部発振器の
信号が相殺され、基準信号の逓倍信号でのみ混合した周
波数で出力される。In the frequency converter according to the present invention, the input low-frequency signal is converted into the output high-frequency signal by the first mixer and the second mixer, and the phase-locked local signal is input to the first mixer. The signal of the phase-locked local oscillator is canceled by the difference or the sum output of the sum or difference output of the oscillator output and the phase-locked local oscillator output included in the local signal of the third mixer output input to the second mixer. , Is output at a frequency mixed only with the multiplied signal of the reference signal.
【００１２】この発明による周波数変換装置は、入力の
高周波信号が第２の混合器と第１の混合器で出力の低周
波信号に変換されるが、第１の混合器に入力する位相同
期局部発振器出力との和または差出力と、第２の混合器
に入力する第３の混合器出力の局部信号が含む位相同期
局部発振器出力との差または和出力で位相同期局部発振
器の信号が相殺され、基準信号の逓倍信号でのみ混合し
た周波数で出力される。In the frequency converter according to the present invention, the high frequency signal of the input is converted into the low frequency signal of the output by the second mixer and the first mixer. The signal of the phase-locked local oscillator is canceled by the difference or the sum output of the sum or difference output of the oscillator output and the phase-locked local oscillator output included in the local signal of the third mixer output input to the second mixer. , Is output at a frequency mixed only with the multiplied signal of the reference signal.
【００１３】また更に、第１の混合器と第２の混合器に
は、それぞれ基本構成の逓倍の変調波で変調されるの
で、出力の高周波信号または出力の低周波信号は、位相
同期局部発振器の出力が相殺され、出力は基準信号の逓
倍信号でのみ混合した周波数で出力される。Furthermore, since the first mixer and the second mixer are each modulated by the multiplying modulated wave of the basic configuration, the output high frequency signal or the output low frequency signal is a phase-locked local oscillator. Are canceled out, and the output is output at a frequency mixed only with the multiplied signal of the reference signal.
【００１４】また更に、第１の混合器と第２の混合器に
は、それぞれ位相同期局部発振器の出力周波数を含む変
調波で変調されるので、出力の高周波信号または出力の
低周波信号は、位相同期局部発振器の出力が相殺され、
出力は基準信号の逓倍信号でのみ混合した周波数で出力
される。Furthermore, since the first mixer and the second mixer are each modulated by a modulation wave including the output frequency of the phase-locked local oscillator, the output high frequency signal or the output low frequency signal is The output of the phase-locked local oscillator is canceled,
The output is output at a frequency mixed only with the multiplied signal of the reference signal.
【００１５】[0015]
実施例１．この発明のダブルコンバータ式の周波数変換
装置を送信機側に応用した例を説明する。図１は、従来
の送信機用の周波数変換装置と対応させて示したこの発
明の一実施例の構成図である。図において、新規な構成
要素は９の基準信号発生回路、１２のその基準信号の周
波数をＮ倍する周波数Ｎ倍器、１３の第３の混合器であ
る。その他の第１の混合器２、第２の混合器５、及びそ
れらのための位相同期局部発振器７は、従来と同等の構
成要素である。Example 1. An example in which the frequency converter of the double converter type of the present invention is applied to the transmitter will be described. FIG. 1 is a block diagram of an embodiment of the present invention shown in association with a conventional frequency conversion device for a transmitter. In the figure, the new components are a reference signal generating circuit 9 and a frequency N multiplier 12 that multiplies the frequency of the reference signal by N, and a third mixer 13. The other first mixer 2, the second mixer 5, and the phase-locked local oscillator 7 for them are components equivalent to the conventional ones.
【００１６】次に周波数変換装置の動作を説明する。説
明の都合上図において、第２の混合器は加算信号を出力
し、第２の混合器は減算信号を出力し、第３の混合器は
加算出力を出力するものとする。基準信号発生回路９の
出力信号ｆS は、位相同期局部発振器７へはそのまま、
第３の混合器１３へは周波数逓倍器１２を経てＮ倍の周
波数が与えられる。第１の混合器２の出力は、入力であ
る低周波信号ｆI1と位相同期局部発振器７の出力である
ｆL1とを混合し、加算出力ｆI2を得る。中間周波数信号
３の位相雑音は、入力の低周波信号１の位相雑音と、位
相同期局部発振器７の位相雑音の和になるが、通常の場
合、入力の低周波数信号１の位相雑音は低いので、中間
周波数信号の位相雑音は位相同期局部発振器７の位相雑
音で決る。Next, the operation of the frequency converter will be described. For convenience of explanation, it is assumed that the second mixer outputs an addition signal, the second mixer outputs a subtraction signal, and the third mixer outputs an addition output. The output signal f S of the reference signal generation circuit 9 is directly applied to the phase-locked local oscillator 7.
The frequency of N times is given to the third mixer 13 through the frequency multiplier 12. The output of the first mixer 2 mixes the input low frequency signal f I1 and the output of the phase-locked local oscillator 7 f L1 to obtain a summed output f I2 . The phase noise of the intermediate frequency signal 3 is the sum of the phase noise of the input low frequency signal 1 and the phase noise of the phase locked local oscillator 7, but in the normal case the phase noise of the input low frequency signal 1 is low. The phase noise of the intermediate frequency signal is determined by the phase noise of the phase locked local oscillator 7.
【００１７】中間周波数信号３は、フィルタ４を経て第
２の混合器５に入力される。一方、第３の混合器の出力
は位相同期局部発振器７の出力であるｆL1と周波数逓倍
機１２の出力であるＮｆS との和信号がｆL2として出力
される。第２の混合器５の出力、つまり周波数変換装置
の出力である高周波信号は、先に述べたように第３の混
合器出力の変調信号ｆL2と第２の中間周波信号ｆI2との
差で得られる。ここで、第１の局部発振周波数ｆL1より
も、第２の中間周波数ｆI2の周波数の方が小さい値で高
周波信号の周波数が第２の局部発振周波数よりも小さい
関係にするか、または第１の局部発振周波数の方が第２
の中間周波数よりも大きな値として高周波信号の周波数
が第２の局部発振周波数よりも大きいの関係に設定す
る。こうすると下記関係式（１）により出力の高周波信
号は、ＮｆS −ｆI1の関係で与えられ、位相同期局部発
振器の位相雑音は、相殺される。即ち、高周波信号の位
相雑音は、基準信号の位相雑音で決る値となる。 ｆRF＝ｆL2−ｆI2 ＝（ｆL1＋ＮｆS ）−（ｆI1＋ｆL1） ＝ＮｆS −ｆI1 （１）The intermediate frequency signal 3 is input to the second mixer 5 through the filter 4. On the other hand, as the output of the third mixer, the sum signal of f L1 which is the output of the phase locked local oscillator 7 and Nf S which is the output of the frequency multiplier 12 is output as f L2 . The output of the second mixer 5, that is, the high frequency signal which is the output of the frequency conversion device, is the difference between the modulation signal f L2 of the third mixer output and the second intermediate frequency signal f I2 as described above. Can be obtained at. Here, the frequency of the second intermediate frequency f I2 is smaller than the first local oscillation frequency f L1 and the frequency of the high frequency signal is smaller than the second local oscillation frequency, or The local oscillation frequency of 1 is the second
The frequency of the high-frequency signal is set to be larger than the intermediate frequency of the second local oscillation frequency. Then, the output high frequency signal is given by the relation of Nf S -f I1 by the following relational expression (1), and the phase noise of the phase locked local oscillator is canceled. That is, the phase noise of the high frequency signal has a value determined by the phase noise of the reference signal. f RF = f L2 -f I2 = (f L1 + Nf S) - (f I1 + f L1) = Nf S -f I1 (1)
【００１８】実施例２．実施例１では信号を高周波信号
に変換し出力をする送信機について説明した。本実施例
では受信機を想定し、高周波信号を入力して所定の第１
の中間周波数信号を出力する周波数変換装置を説明す
る。図２は、本実施例における周波数変換装置の構成を
示す図である。図の構成要素は、実施例１で述べたと同
様のものである。本実施例においては、信号は高周波信
号６ｆRFが入力となり、第２の混合器を経て第２の中間
周波数信号ｆI2に変換されるさらにこれが、第１の混合
器を経て出力である低周波信号１ｆI1として出力され
る。本実施例において、第２の局部発振周波数を高周波
信号の周波数よりも大きい値で第１の混合器の第１の局
部発振周波数を第２の中間周波数よりも小さな値とする
か、または、第２の局部発振周波数を入力の高周波信号
周波数よりも小さくし、第１の混合器の第１の局部発振
周波数を第２の中間周波数よりも大きな値に設定する。
即ち、上記の関係は第１の混合器を加算の関係にすると
第２の混合器５を減算の関係にするか、もしくは第１の
混合器の関係を減算の関係にすると、第２の混合器の関
係を加算の関係にすることを表しており、このことは第
１と第２の混合器により位相同期局部発振器の周波数が
相殺されることを意味する。Example 2. In the first embodiment, the transmitter that converts a signal into a high frequency signal and outputs the high frequency signal has been described. In the present embodiment, a receiver is assumed, and a high frequency signal is input and a predetermined first signal is input.
A frequency conversion device that outputs the intermediate frequency signal will be described. FIG. 2 is a diagram showing the configuration of the frequency conversion device in this embodiment. The components in the figure are the same as those described in the first embodiment. In the present embodiment, the high frequency signal 6f RF is input to the signal and is converted into a second intermediate frequency signal f I2 through a second mixer, and this is further converted into a low frequency signal which is an output through the first mixer. It is output as the signal 1f I1 . In the present embodiment, the second local oscillation frequency is set to a value higher than the frequency of the high frequency signal and the first local oscillation frequency of the first mixer is set to a value lower than the second intermediate frequency, or The second local oscillation frequency is set lower than the input high frequency signal frequency, and the first local oscillation frequency of the first mixer is set to a value higher than the second intermediate frequency.
That is, the above relationship is such that when the first mixer is in the addition relationship, the second mixer 5 is in the subtraction relationship, or when the first mixer is in the subtraction relationship, the second mixing is performed. It means that the relationship of the phase-locked local oscillator is canceled by the first and second mixers.
【００１９】実施例３．本発明の周波数変換装置におい
ては、位相同期局部発振器を１つとして第１の混合器と
第２の混合器に与えた変調信号を相殺させることが主旨
であるから、基本思想に基づく変化が種々考えられる。
本実施例においては、位相同期局部発振器の出力周波数
を第２、第３の周波数逓倍器を用いて逓倍し、局部信号
とするものである。図３は、本実施例における周波数変
換装置の構成を示す図である。図において実施例１から
さらに付加する要素としては、１４の第２の周波数逓倍
器と１５の第３の周波数逓倍器がある。第３の周波数逓
倍機１５の逓倍の割合と、第２の周波数逓倍器１４の逓
倍の割合は、等しくする。上記構成の動作は、第１図で
説明したものと同様であり、実施例１との主要な違い
は、第１の混合器３と第２の混合器５への局部信号がそ
れぞれＮ倍されていることなので動作の詳細な説明は省
略する。上記構成によっても位相同期局部発振器の位相
雑音は、相殺されることは明らかである。Embodiment 3 FIG. In the frequency converter of the present invention, since it is intended to cancel the modulation signals given to the first mixer and the second mixer by using one phase-locked local oscillator, there are various changes based on the basic idea. Conceivable.
In this embodiment, the output frequency of the phase-locked local oscillator is multiplied by using the second and third frequency multipliers to obtain a local signal. FIG. 3 is a diagram showing the configuration of the frequency conversion device in this embodiment. In the figure, as additional elements from the first embodiment, there are 14 second frequency multipliers and 15 third frequency multipliers. The multiplication rate of the third frequency multiplier 15 and the multiplication rate of the second frequency multiplier 14 are made equal. The operation of the above configuration is the same as that described in FIG. 1, and the main difference from the first embodiment is that the local signals to the first mixer 3 and the second mixer 5 are multiplied by N respectively. Therefore, detailed description of the operation is omitted. It is apparent that the phase noise of the phase locked local oscillator is canceled by the above configuration as well.
【００２０】実施例４．実施例２の受信機に実施例３の
思想を適用したものが図４に示す周波数変換装置であ
る。図４に示す入力の高周波信号６から出力の低周波数
信号１へ変換される動作および、その位相雑音の影響は
実施例２と実施例３より明らかであるので詳細説明を省
略する。Example 4. The frequency conversion device shown in FIG. 4 is obtained by applying the concept of the third embodiment to the receiver of the second embodiment. The operation of converting the input high-frequency signal 6 to the output low-frequency signal 1 shown in FIG. 4 and the influence of the phase noise thereof are apparent from the second and third embodiments, and therefore detailed description thereof will be omitted.
【００２１】実施例５．図５は更に他の送信機用の周波
数変換装置の構成を示す図である。図において、実施例
１の周波数変換装置に付加される要素は、１６のＬ倍の
周波数逓倍器と１７の第４の混合器である。本実施例に
おいては、第１の混合器２の局部信号１０ ｆL1は、例
えば、位相同期局部発振器７の出力信号ｆL3と第４の周
波数逓倍器１６の出力であるＬｆS との和で与えられ
る。第４の混合器の出力の局部信号１０ ｆL1は、ｆL3
＋ＬｆSである。最終出力の高周波信号６の周波数ｆRF
は（Ｎ−Ｌ）ｆS −ｆI1となる。即ち同様に位相同期局
部発振器７の位相雑音は、相殺されることがわかる。Example 5. FIG. 5 is a diagram showing the configuration of a frequency conversion device for another transmitter. In the figure, the elements added to the frequency converter of the first embodiment are 16 L-times frequency multipliers and 17 fourth mixers. In this embodiment, the local signal 10 f L1 of the first mixer 2 is, for example, the sum of the output signal f L3 of the phase-locked local oscillator 7 and the output Lf S of the fourth frequency multiplier 16. Given. The local signal 10 f L1 at the output of the fourth mixer is f L3
+ Lf S. The frequency f RF of the high-frequency signal 6 of the final output
Becomes (N−L) f S −f I1 . That is, similarly, it can be seen that the phase noise of the phase locked local oscillator 7 is canceled.
【００２２】実施例６．図６は、実施例２の受信機に実
施例５の構成を適用した周波数変換装置の構成図であ
る。図において、入力の高周波信号６が第２の混合器５
と第１の混合器２を経て出力の低周波信号１に変換され
る。図の構成の動作は、図５の説明と実施例２の動作説
明から明らかであるので詳細動作の説明は省略する。図
６の構成による周波数変換装置においても位相同期局部
発振器の位相雑音が相殺されることは明らかである。Embodiment 6. FIG. 6 is a configuration diagram of a frequency conversion device in which the configuration of the fifth embodiment is applied to the receiver of the second embodiment. In the figure, the input high-frequency signal 6 is the second mixer 5
And the low frequency signal 1 of the output through the first mixer 2. The operation of the configuration shown in the figure is clear from the description of FIG. 5 and the operation description of the second embodiment, and thus the detailed description of the operation is omitted. It is clear that the phase noise of the phase locked local oscillator is canceled in the frequency converter having the configuration of FIG.
【００２３】[0023]
【発明の効果】以上述べたように本発明の周波数変換装
置は、基準信号発生回路とその周波数を逓倍する周波数
逓倍器と位相同期局部発振器に対しては和と差の関係を
もつ第１と第２の混合器を用いたので、位相同期局部発
振器の位相雑音が相殺される効果がある。As described above, the frequency conversion device of the present invention has the first and second relations with respect to the reference signal generating circuit, the frequency multiplier for multiplying the frequency thereof, and the phase-locked local oscillator. Since the second mixer is used, there is an effect of canceling the phase noise of the phase locked local oscillator.
【００２４】本発明の周波数変換装置は、入力の高周波
信号から出力の低周波信号を得るに際して基準信号発生
回路とその逓倍周波数を得る周波数逓倍器と位相同期局
部発振器に対しては和と差の信号を得る第１と第２の混
合器を備えたので、位相同期局部発振器の位相雑音が相
殺できる効果がある。The frequency converter according to the present invention, when obtaining an output low frequency signal from an input high frequency signal, a reference signal generating circuit, a frequency multiplier for obtaining a frequency multiplied by the reference signal generating circuit, and a sum and difference for a phase locked local oscillator. Since the first and second mixers for obtaining signals are provided, there is an effect that the phase noise of the phase locked local oscillator can be canceled.
【００２５】さらに、また第１と第２の混合器の変調信
号としてそれぞれ同一逓倍率の周波数逓倍器を付加した
構成としたので、同様に位相雑音を相殺する効果があ
る。Further, since the frequency multipliers having the same multiplication rate are added as the modulation signals of the first and second mixers, the phase noise is similarly canceled.
【００２６】また、さらに第１の混合器に対して基準信
号の逓倍周波数と位相同期局部発振器の和信号を変調信
号として与える構成としたので、位相同期局部発振器の
位相雑音を相殺する効果がある。Further, since the first mixer is configured to give the multiplication frequency of the reference signal and the sum signal of the phase-locked local oscillator as the modulation signal, there is an effect of canceling the phase noise of the phase-locked local oscillator. .
【図１】 この発明の一実施例である送信用の周波数変
換装置の構成図である。FIG. 1 is a configuration diagram of a frequency converter for transmission that is an embodiment of the present invention.
【図２】 実施例２の受信用の周波数変換装置の構成図
である。FIG. 2 is a configuration diagram of a frequency conversion device for reception according to a second embodiment.
【図３】 実施例３の送信用の周波数変換装置の構成図
である。FIG. 3 is a configuration diagram of a frequency converter for transmission according to a third embodiment.
【図４】 実施例４の受信用の周波数変換装置の構成図
である。FIG. 4 is a configuration diagram of a frequency converter for reception according to a fourth embodiment.
【図５】 実施例５の送信用の周波数変換装置の構成図
である。FIG. 5 is a configuration diagram of a frequency converter for transmission according to a fifth embodiment.
【図６】 実施例６の受信用の周波数変換装置の構成図
である。FIG. 6 is a configuration diagram of a frequency conversion device for reception according to a sixth embodiment.
【図７】 従来の送信用の周波数変換装置の構成図であ
る。FIG. 7 is a block diagram of a conventional frequency converter for transmission.
【図８】 従来の受信用の周波数変換装置の構成図であ
る。FIG. 8 is a block diagram of a conventional frequency converter for reception.
１ 中間周波数信号、２ 第１の混合器、３ 第２の中
間周波数信号、４ ろ波器、５ 第２の混合器、６ 高
周波信号、７ 第１の位相同期局部発振器、８第２の位
相同期局部発振器、９ 位相同期局部発振器の基準信
号、１０ 第１の局部信号、１１ 第２の局部信号、１
２ 基準信号の逓倍器、１３ 混合器、１４ 第１の局
部信号の逓倍器、１５ 第２の局部信号の逓倍器、１６
基準信号の逓倍器、１７ 混合器。1 intermediate frequency signal, 2 1st mixer, 3 2nd intermediate frequency signal, 4 filter, 5 2nd mixer, 6 high frequency signal, 7 1st phase-locked local oscillator, 8 2nd phase Synchronous local oscillator, 9 Phase-locked local oscillator reference signal, 10 First local signal, 11 Second local signal, 1
2 Reference Signal Multiplier, 13 Mixer, 14 First Local Signal Multiplier, 15 Second Local Signal Multiplier, 16
Reference signal multiplier, 17 mixer.
Claims (4)
準信号発生回路と、該基準信号の周波数を逓倍する周波
数逓倍器と、 上記基準信号で発振する位相同期局部発振器と、 入力の低周波信号を上記位相同期局部発振器の出力と混
合し、中間周波信号を得る第１の混合器と、 上記位相同期局部発振器の出力信号と上記逓倍した基準
信号を混合して第２の混合器用の局部信号を生成する第
３の混合器と、 上記第３の混合器出力の局部信号と上記中間周波信号と
を混合して出力の高周波信号を得る第２の混合器とを備
えた周波数変換装置。1. A reference signal generation circuit for giving a reference signal for frequency conversion, a frequency multiplier for multiplying the frequency of the reference signal, a phase-locked local oscillator oscillating with the reference signal, and an input low-frequency signal. Is mixed with the output of the phase-locked local oscillator to obtain an intermediate frequency signal, and the output signal of the phase-locked local oscillator is mixed with the multiplied reference signal to obtain a local signal for the second mixer. And a second mixer for generating a high frequency signal by mixing the local signal of the third mixer output and the intermediate frequency signal.
準信号発生回路と、該基準信号の周波数を逓倍する周波
数逓倍器と、 上記基準信号で発振する位相同期局部発振器と、 上記位相同期局部発振器の出力信号と上記逓倍した基準
信号を混合して第２の混合器用の局部信号を生成する第
３の混合器と、 入力の高周波信号を上記第３の混合器の出力の局部信号
で混合し、中間周波信号を得る第２の混合器と、 上記中間周波信号と上記位相同期局部発振器の出力とを
混合して出力の低周波信号を得る第１の混合器とを備え
た周波数変換装置。2. A reference signal generating circuit for giving a reference signal for frequency conversion, a frequency multiplier for multiplying the frequency of the reference signal, a phase-locked local oscillator oscillating with the reference signal, and the phase-locked local oscillator. And a third mixer for mixing the output signal of 1) and the multiplied reference signal to generate a local signal for the second mixer, and a high frequency signal at the input for mixing at the local signal at the output of the third mixer. A frequency converter comprising: a second mixer for obtaining an intermediate frequency signal; and a first mixer for mixing the intermediate frequency signal and the output of the phase locked local oscillator to obtain an output low frequency signal.
第１の逓倍器の他に第１の混合器に与える位相同期局部
発振器の出力を逓倍する第２の逓倍器と、第２の混合器
に与える第３の混合器出力を逓倍し、その逓倍数を第２
の逓倍器と同一とする第３の逓倍器を備え、 上記第１の混合器は位相同期局部発振器の出力に代えて
第２の逓倍器出力を局部信号として入力し、上記第２の
混合器は第３の混合器出力に代えて第３の逓倍器出力を
局部信号として混合するようにしたことを特徴とする請
求項１または請求項２記載の周波数変換装置。3. Further, the multiplier is a first multiplier,
In addition to the first multiplier, a second multiplier for multiplying the output of the phase-locked local oscillator that is given to the first mixer, and a third mixer output that is given to the second mixer are multiplied, and the multiplication is performed. Number two
A third multiplier identical to the second multiplier, wherein the first mixer inputs the second multiplier output as a local signal instead of the output of the phase-locked local oscillator, and outputs the second mixer. 3. The frequency conversion device according to claim 1, wherein the third mixer output is mixed as a local signal instead of the third mixer output.
第１の逓倍器の他に基準信号を第１の逓倍器よりは少な
い数で逓倍する第２の逓倍器と、該第２の逓倍器出力と
位相同期局部発振器の出力とを混合し、第１の混合器用
の局部信号を得る第４の混合器を備え、 上記第１の混合器は、位相同期局部発振器の出力に代え
て第４の混合器出力の局部信号で混合することを特徴と
する請求項１または請求項２記載の周波数変換装置。4. Further, the multiplier is a first multiplier,
In addition to the first multiplier, a second multiplier that multiplies the reference signal by a smaller number than the first multiplier, a second multiplier output and a phase-locked local oscillator output are mixed, A fourth mixer for obtaining a local signal for the first mixer, wherein the first mixer mixes with the local signal of the fourth mixer output instead of the output of the phase-locked local oscillator. The frequency conversion device according to claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06242674A JP3077528B2 (en) | 1994-10-06 | 1994-10-06 | Frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06242674A JP3077528B2 (en) | 1994-10-06 | 1994-10-06 | Frequency converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08107315A true JPH08107315A (en) | 1996-04-23 |
| JP3077528B2 JP3077528B2 (en) | 2000-08-14 |
Family
ID=17092558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06242674A Expired - Fee Related JP3077528B2 (en) | 1994-10-06 | 1994-10-06 | Frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3077528B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006229404A (en) * | 2005-02-16 | 2006-08-31 | Nec Corp | Double frequency converter |
| US8093943B2 (en) | 2007-02-14 | 2012-01-10 | Nec Corporation | Phase noise correction device and its method |
-
1994
- 1994-10-06 JP JP06242674A patent/JP3077528B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006229404A (en) * | 2005-02-16 | 2006-08-31 | Nec Corp | Double frequency converter |
| US8093943B2 (en) | 2007-02-14 | 2012-01-10 | Nec Corporation | Phase noise correction device and its method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3077528B2 (en) | 2000-08-14 |
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