WO2014030350A1 - Harmonic mixer circuit and method for controlling same - Google Patents

Harmonic mixer circuit and method for controlling same Download PDF

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WO2014030350A1
WO2014030350A1 PCT/JP2013/004948 JP2013004948W WO2014030350A1 WO 2014030350 A1 WO2014030350 A1 WO 2014030350A1 JP 2013004948 W JP2013004948 W JP 2013004948W WO 2014030350 A1 WO2014030350 A1 WO 2014030350A1
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signal
mixer
harmonic
mixer circuit
bias voltage
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Japanese (ja)
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遼一 鈴木
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日本電気株式会社
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/02—Transference of modulation from one carrier to another, e.g. frequency-changing by means of diodes

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  • the present invention relates to a harmonic mixer circuit and a control method thereof, and more particularly, to a harmonic mixer circuit used in a transmitter and a control method thereof.
  • a baseband signal is converted into an intermediate frequency (IF) signal, and then mixed with a local oscillation (Local Oscillator: LO) signal to obtain a desired high frequency.
  • IF intermediate frequency
  • LO local oscillation
  • RF Radio Frequency
  • a mixer circuit is used for this frequency conversion, and in particular in the microwave band, a harmonic mixer circuit using an anti-parallel diode is often used.
  • the reason is that in the harmonic mixer circuit, the LO signal can be made low, and spurious components in the vicinity of the RF signal are suppressed in principle. The principle is described below.
  • fRF m ⁇ fLO + n ⁇ fIF
  • fRF is the frequency of the output RF signal
  • fLO is the frequency of the input LO signal
  • fIF is the frequency of the input IF signal.
  • M and n are arbitrary integers.
  • the LO frequency can be lowered.
  • the 2fLO signal which is a nearby spurious component, is suppressed because
  • 2 and
  • the two diode characteristics constituting the anti-parallel diode are not necessarily the same DC characteristics in manufacturing. For this reason, the odd function of the IV characteristic of the anti-parallel diode may be lost due to manufacturing variation or the like (characteristic B in FIG. 3). In this case, there is a problem that an unnecessary wave component having an even frequency is generated in addition to the frequency component in which
  • Patent Document 2 An example of a harmonic mixer circuit that solves such a problem is described in Patent Document 2.
  • the harmonic mixer circuit described in Patent Document 2 mixes a reception signal input to a reception signal input terminal and a local oscillation signal input to a local oscillation signal input terminal with an anti-parallel diode, and outputs the mixed signal to an output terminal It is set as the structure which outputs from. Then, a detection circuit that detects a signal component in an even-order conversion mode from a signal on the side where the local oscillation signal of the antiparallel diode is input, and an anti-control signal that reduces the signal component detected by the detection circuit. And a control circuit for inputting to the parallel diode.
  • the detection circuit includes a high-pass filter that passes a signal component twice the frequency of the local oscillation signal, a detection circuit that detects a signal that has passed through the high-pass filter, and outputs a voltage value indicating the level of the signal; including.
  • the control circuit inputs a control voltage that minimizes the voltage value output from the detection circuit to the anti-parallel diode as a control signal.
  • the operating point of the anti-parallel diode is determined at a position where the difference in characteristics between the two diodes constituting the anti-parallel diode is canceled, so that the even-order conversion mode can be eliminated.
  • the noise component fLO ⁇ fIF included in the LO signal disappears because
  • 2 and the even-order conversion mode.
  • the noise component fLO ⁇ fIF included in the LO signal input to the reception harmonic mixer circuit is not converted to the IF band, and the deterioration of the NF (Noise Figure) characteristic of the reception harmonic mixer circuit is suppressed. I can do it.
  • the IV characteristic of the anti-parallel diode varies depending on the impedance viewed from the input / output port of the mixer (characteristic C in FIG. 3).
  • a matching circuit is formed in the input / output portion of the mixer in order to improve the injection efficiency of the LO signal and optimize the conversion efficiency from the IF signal to the RF signal (not shown).
  • the impedance seen from the input / output port by the matching circuit changes according to the frequency.
  • the DC voltage for applying the offset voltage also changes depending on this frequency, and the method of simply applying the DC voltage directly to the anti-parallel diode without detecting the 2fLO signal component suppresses unnecessary waves. The conclusion is difficult. As described above, detection of the 2fLO signal component is essential.
  • An object of the present invention is to solve the above-described problem that when a harmonic mixer circuit is used in a transmitter, it is difficult to suppress the generation of unnecessary waves and the characteristics of the harmonic mixer circuit are deteriorated. It is to provide a mixer circuit and a control method thereof.
  • the harmonic mixer circuit of the present invention inputs a local oscillation signal and an intermediate frequency signal, outputs a high frequency signal, a main mixer, inputs a local oscillation signal, outputs a reference signal, and inputs a reference signal.
  • a detection unit that outputs a detection signal; and a control unit that adds a bias voltage to the main mixer and the reference mixer based on the detection signal.
  • the harmonic mixer circuit control method of the present invention mixes the local oscillation signal and the intermediate frequency signal using the main mixer, outputs the high frequency signal, and outputs the harmonic signal of the local oscillation signal using the reference mixer.
  • the bias voltage is determined based on the harmonic signal, and the bias voltage is applied to the main mixer and the reference mixer.
  • the harmonic mixer circuit and the control method thereof of the present invention it is possible to suppress the generation of unnecessary waves even when the harmonic mixer circuit is used as a transmitter, and to provide a harmonic mixer circuit having good characteristics. Obtainable.
  • FIG. 1 is a block diagram showing a configuration of a harmonic mixer circuit according to an embodiment of the present invention.
  • the harmonic mixer circuit 100 of the present embodiment receives a local oscillation (LO) signal and an intermediate frequency (IF) signal, outputs a high frequency (RF) signal, inputs a LO signal, and outputs a reference signal.
  • LO local oscillation
  • IF intermediate frequency
  • RF high frequency
  • a reference mixer 20 Furthermore, it has the detection part 30 which inputs a reference signal and outputs a detection signal, and the control part 40 which applies a bias voltage to the main mixer 10 and the reference mixer 20 based on a detection signal.
  • FIG. 2 is a block diagram showing a configuration of the harmonic mixer circuit 100 according to the embodiment of the present invention.
  • the LO signal input port 1 to which the LO signal having the frequency fLO is input is connected to one end of the main mixer 10 and the reference mixer 20.
  • the other end of the main mixer 10 is connected to an IF signal input port 2 to which an IF signal having a frequency fIF is input.
  • the main mixer 10 is connected to an RF signal output port 3 from which an RF signal having a frequency fRF is extracted.
  • the other end of the reference mixer 20 is connected to a reference signal output port 4 from which the LO signal that has passed through the reference mixer 20 is taken out as a reference signal.
  • the main mixer 10 and the reference mixer 20 are connected to a voltage application port 5 to which a bias voltage output from the control unit 40 is applied. It should be noted that the configuration described so far is desirably mounted on the same substrate 60.
  • the main mixer 10 and the reference mixer 20 can be configured to include anti-parallel diodes in which the two Schottky barrier diodes 11 and 12 (21 and 22) are connected in parallel so that their polarities are opposite to each other.
  • the antiparallel diodes of the main mixer 10 and the reference mixer 20 can have substantially the same characteristics by being mounted on the same substrate 60.
  • LO signal input port 1, IF signal input port 2, RF signal output port 3, reference signal output port 4, voltage application port 5, main mixer 10 and reference mixer 20 are arranged on the same substrate 60. Constitutes an integrated circuit.
  • the detection unit 30 can be configured to include a band pass filter 32 on the signal input side from the reference mixer 20.
  • the band pass filter 32 allows even-order harmonic components of the LO signal output from the reference mixer 20 to pass as a reference signal. By setting it as such a structure, the detection part 30 can detect only an unnecessary wave component accurately.
  • the detection unit 30 can be configured to include a detection circuit 31 in the subsequent stage of the band pass filter 32.
  • the detection circuit 31 performs envelope detection of the reference signal that has passed through the band-pass filter 32 and outputs it as a detection signal.
  • the control unit 40 acquires a detection signal from the detection circuit 31.
  • the control unit 40 outputs an offset voltage that minimizes the detection signal output from the detection circuit 31 to the voltage output port 5.
  • the LO signal input from the LO signal input port 1 is equally distributed and input to the main mixer 10 and the reference mixer 20 with the same amplitude. Further, the IF signal input from the IF signal input port 2 is input to the main mixer 10. As a result, an RF signal whose frequency is expressed by the following equation is generated at the RF signal output port 3 of the main mixer 10.
  • fRF m ⁇ fLO + n ⁇ fIF
  • fRF represents the frequency of the RF signal
  • fLO represents the frequency of the LO signal
  • m and n represent arbitrary integers.
  • the reference mixer 20 inputs only the LO signal.
  • the main mixer 10 and the reference mixer 20 are configured on the same substrate 60 using anti-parallel diodes having the same structure, thereby reducing individual variations in characteristics caused in manufacturing. That is, the frequency characteristics of the main mixer 10 and the reference mixer 20 are substantially equal, and the m ⁇ fLO component outputs at the RF signal output port 3 and the reference signal output port 4 are substantially the same.
  • the unnecessary wave component that appears closest to the desired RF signal is a component having a frequency of 2fLO.
  • the reference signal (m ⁇ fLO) output from the reference signal output port 4 only the 2fLO component of the even harmonic components is passed through the band pass filter 32.
  • the 2fLO component is detected by the detection circuit 31, and an envelope voltage signal is output from the detection unit 30 as a detection signal.
  • the control unit 40 applies an offset voltage that minimizes the acquired detection signal to the voltage application port 5.
  • the LO signal and IF signal are mixed using the main mixer 10 to output an RF signal. Further, a harmonic signal of the LO signal is output using the reference mixer 20. Next, a bias voltage is determined based on the harmonic signal, and the bias voltage is applied to the main mixer 10 and the reference mixer 20.
  • the frequency fRF of the RF signal can be a frequency that is a linear sum (m ⁇ fLO + n ⁇ fIF (m and n are integers)) of the frequency fLO of the LO signal and the frequency fIF of the IF signal.
  • This can be realized by, for example, a harmonic mixer circuit using an anti-parallel diode.
  • the dependency of the even-order harmonic component included in the output of the reference mixer 20 on the bias voltage is dependent on the bias voltage of the even-order mixed wave component included in the output of the main mixer 10. It is desirable to be approximately equal to the sex. This can be realized, for example, by using the main mixer 10 and the reference mixer 20 arranged on the same substrate.
  • the bias voltage can be determined by obtaining an envelope voltage by detecting even-order harmonic signals among the harmonic signals and obtaining a bias voltage at which the envelope voltage is minimized. This can be realized, for example, by using a detection circuit.
  • the harmonic mixer circuit and the control method thereof according to the present embodiment even when the harmonic mixer circuit is used for a transmitter, it is possible to suppress the generation of unnecessary waves and have good characteristics. Can be obtained. This is because by using the reference mixer 20, it is possible to accurately detect only the unnecessary wave component.
  • the present invention can be used for, for example, a harmonic mixer circuit used in a transmitter and a control method thereof.

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Abstract

[Problem] When a harmonic mixer circuit is used for a transmitter, it is difficult to sufficiently suppress generation of unwanted waves, and the properties of the harmonic mixer circuit are degraded. [Solution] This harmonic mixer circuit has: a main mixer for inputting a local emission signal and an intermediate frequency signal and outputting a high frequency signal; a reference mixer for inputting the local emission signal and outputting a reference signal; a sensor for inputting the reference signal and outputting a sensing signal; and a controller for applying a bias voltage to the main mixer and the reference mixer on the basis of the sensing signal.

Description

ハーモニックミキサ回路およびその制御方法Harmonic mixer circuit and control method thereof
　本発明は、ハーモニックミキサ回路およびその制御方法に関し、特に、送信器に用いられるハーモニックミキサ回路およびその制御方法に関する。 The present invention relates to a harmonic mixer circuit and a control method thereof, and more particularly, to a harmonic mixer circuit used in a transmitter and a control method thereof.
　マイクロ波・ミリ波通信装置においては、一般的に、ベースバンド信号を中間周波（Ｉｎｔｅｒｍｅｄｉａｔｅ　Ｆｒｅｑｕｅｎｃｙ　：ＩＦ）信号に変換した後に、局部発振（Ｌｏｃａｌ　Ｏｓｃｉｌｌａｔｏｒ　：ＬＯ）信号と混合して、目的とする高周波（Ｒａｄｉｏ　Ｆｒｅｑｕｅｎｃｙ　：ＲＦ）信号に変換する。 In a microwave / millimeter wave communication apparatus, generally, a baseband signal is converted into an intermediate frequency (IF) signal, and then mixed with a local oscillation (Local Oscillator: LO) signal to obtain a desired high frequency. (Radio Frequency: RF) signal is converted.
　この周波数変換にはミキサ回路が使用され、特に、マイクロ波帯においてはアンチパラレルダイオードを用いたハーモニックミキサ回路がしばしば用いられる。その理由は、ハーモニックミキサ回路においては、ＬＯ信号を低くとることが出来ること、および、ＲＦ信号の近傍のスプリアス成分が原理的に抑圧されることなどにある。その原理を以下に述べる。 A mixer circuit is used for this frequency conversion, and in particular in the microwave band, a harmonic mixer circuit using an anti-parallel diode is often used. The reason is that in the harmonic mixer circuit, the LO signal can be made low, and spurious components in the vicinity of the RF signal are suppressed in principle. The principle is described below.
　ハーモニックミキサ回路における入出力信号の周波数関係は次式により表される。 The frequency relationship of input / output signals in the harmonic mixer circuit is expressed by the following equation.
　ｆＲＦ＝ｍ×ｆＬＯ＋ｎ×ｆＩＦ
ここで、ｆＲＦは出力されるＲＦ信号の周波数、ｆＬＯは入力されるＬＯ信号の周波数、ｆＩＦは入力されるＩＦ信号の周波数である。また、ｍおよびｎは任意の整数である。 fRF = m × fLO + n × fIF
Here, fRF is the frequency of the output RF signal, fLO is the frequency of the input LO signal, and fIF is the frequency of the input IF signal. M and n are arbitrary integers.
　２つのショットキーバリアダイオードの極性が互いに逆になるように並列接続されたアンチパラレルダイオードの電流－電圧（Ｉ－Ｖ）特性は、図３に示すように奇関数となる（図３中の特性Ａ）。そのため、アンチパラレルダイオードを用いたハーモニックキミサ回路では、上記周波数関係のうち｜ｍ｜＋｜ｎ｜が奇数となる周波数成分のＲＦ信号だけが発生し、｜ｍ｜＋｜ｎ｜が偶数となる周波数成分のＲＦ信号は発生しないことになる。 The current-voltage (IV) characteristics of anti-parallel diodes connected in parallel so that the polarities of the two Schottky barrier diodes are opposite to each other are odd functions as shown in FIG. 3 (characteristics in FIG. 3). A). Therefore, in a harmonic Kimisa circuit using an anti-parallel diode, only an RF signal having a frequency component in which | m | + | n | is odd among the frequency relationships is generated, and | m | + | n | An RF signal having a frequency component is not generated.
　ここで、アンチパラレルダイオードを用いたハーモニックキミサ回路においてｆＲＦ＝２ｆＬＯ＋ｆＩＦ（｜ｍ｜＋｜ｎ｜＝３）となるように周波数関係を選択すると、ＬＯ周波数を低くすることができる。あわせて近傍のスプリアス成分である２ｆＬＯ信号は、｜ｍ｜＋｜ｎ｜＝２であって｜ｍ｜＋｜ｎ｜が偶数となるので、抑圧されることとなる。 Here, if the frequency relationship is selected so that fRF = 2fLO + fIF (| m | + | n | = 3) in the harmonic Kimisa circuit using the anti-parallel diode, the LO frequency can be lowered. In addition, the 2fLO signal, which is a nearby spurious component, is suppressed because | m | + | n | = 2 and | m | + | n | is an even number.
　しかしながら、アンチパラレルダイオードを構成する２つのダイオード特性は、製造上必ずしも同一のＤＣ特性とはならない。そのため、製造ばらつき等に起因してアンチパラレルダイオードのＩ－Ｖ特性の奇関数性が失われる場合がある（図３の特性Ｂ）。この場合、｜ｍ｜＋｜ｎ｜が奇数となる周波数成分の他に、偶数となる周波数を有する不要波成分も発生してしまうという問題がある（例えば、特許文献１参照）。 However, the two diode characteristics constituting the anti-parallel diode are not necessarily the same DC characteristics in manufacturing. For this reason, the odd function of the IV characteristic of the anti-parallel diode may be lost due to manufacturing variation or the like (characteristic B in FIG. 3). In this case, there is a problem that an unnecessary wave component having an even frequency is generated in addition to the frequency component in which | m | + | n | is an odd number (for example, see Patent Document 1).
　このような問題を解決するハーモニックミキサ回路の一例が特許文献２に記載されている。特許文献２に記載されたハーモニックミキサ回路は、受信信号入力端子に入力される受信信号と局部発振信号入力端子に入力される局部発振信号とをアンチパラレルダイオードで混合し、混合した信号を出力端子から出力する構成としている。そして、アンチパラレルダイオードの局部発振信号が入力される側の信号から、偶数次の変換モードによる信号成分を検出する検出回路と、この検出回路が検出する信号成分を減少させるように制御信号をアンチパラレルダイオードに入力する制御回路とを備える。 An example of a harmonic mixer circuit that solves such a problem is described in Patent Document 2. The harmonic mixer circuit described in Patent Document 2 mixes a reception signal input to a reception signal input terminal and a local oscillation signal input to a local oscillation signal input terminal with an anti-parallel diode, and outputs the mixed signal to an output terminal It is set as the structure which outputs from. Then, a detection circuit that detects a signal component in an even-order conversion mode from a signal on the side where the local oscillation signal of the antiparallel diode is input, and an anti-control signal that reduces the signal component detected by the detection circuit. And a control circuit for inputting to the parallel diode.
　検出回路は、局部発振信号の周波数の２倍の信号成分を通過させる高域通過フィルタと、高域通過フィルタを通過した信号を検波してその信号のレベルを示す電圧値を出力する検波回路とを含む。制御回路は、検波回路が出力する電圧値を最小にする制御電圧を制御信号としてアンチパラレルダイオードに入力する。この場合、アンチパラレルダイオードの動作点は、アンチパラレルダイオードを構成する２つのダイオードの特性の差異を打ち消す位置に定められるので、偶数次の変換モードを消滅させることができる。そうすると、ＬＯ信号に含まれる雑音成分ｆＬＯ±ｆＩＦは、｜ｍ｜＋｜ｎ｜＝２と偶数次の変換モードであるので消滅する。この結果、受信ハーモニックミキサ回路に入力されるＬＯ信号に含まれる雑音成分ｆＬＯ±ｆＩＦがＩＦ帯に変換されることがなくなり、受信ハーモニックミキサ回路のＮＦ（Ｎｏｉｓｅ　Ｆｉｇｕｒｅ：雑音指数）特性の劣化を抑えることができる、としている。 The detection circuit includes a high-pass filter that passes a signal component twice the frequency of the local oscillation signal, a detection circuit that detects a signal that has passed through the high-pass filter, and outputs a voltage value indicating the level of the signal; including. The control circuit inputs a control voltage that minimizes the voltage value output from the detection circuit to the anti-parallel diode as a control signal. In this case, the operating point of the anti-parallel diode is determined at a position where the difference in characteristics between the two diodes constituting the anti-parallel diode is canceled, so that the even-order conversion mode can be eliminated. Then, the noise component fLO ± fIF included in the LO signal disappears because | m | + | n | = 2 and the even-order conversion mode. As a result, the noise component fLO ± fIF included in the LO signal input to the reception harmonic mixer circuit is not converted to the IF band, and the deterioration of the NF (Noise Figure) characteristic of the reception harmonic mixer circuit is suppressed. I can do it.
特開２００７－２７４０４０号公報JP 2007-274040 A 特開２０１０－１５４０４８号公報JP 2010-154048 A
　上述した、製造ばらつき等に起因して｜ｍ｜＋｜ｎ｜が偶数となる周波数を有する不要波成分が発生してしまうという問題を、例えば、２ｆＬＯの信号成分を検出することなく解決するために、以下の方法が考えられる。端的には、アンチパラレルダイオードに直接ＤＣ電圧を印加してオフセット電圧を設定することにより、ダイオードのＩ－Ｖ特性における奇関数対称性からのズレを修正して、｜ｍ｜＋｜ｎ｜が偶数次となる周波数成分を抑制する方法である。 In order to solve the above-described problem that an unnecessary wave component having a frequency with an even | m | + | n | due to manufacturing variation or the like is generated without detecting a 2fLO signal component, for example. In addition, the following methods can be considered. In short, by applying the DC voltage directly to the anti-parallel diode and setting the offset voltage, the deviation from the odd-function symmetry in the IV characteristic of the diode is corrected, and | m | + | n | This is a method for suppressing even-order frequency components.
　しかしながら、アンチパラレルダイオードのＩ－Ｖ特性はミキサの入出力ポートからみたインピーダンスによって変化する（図３の特性Ｃ）。その理由は、ミキサの入出力部分には、ＬＯ信号の注入効率の向上、および、ＩＦ信号からＲＦ信号への変換効率の最適化のために、マッチング回路が形成されており（図示しない回路）、そのマッチング回路によって入出力ポートからみたインピーダンスは周波数に応じて変化するからである。その結果、オフセット電圧を印加するためのＤＣ電圧もこの周波数によって変化することとなり、２ｆＬＯの信号成分を検出することなく単にＤＣ電圧を直接アンチパラレルダイオードに印加する方法では、不要波を抑制することは困難という結論となる。以上のように、２ｆＬＯの信号成分の検出は必須である。 However, the IV characteristic of the anti-parallel diode varies depending on the impedance viewed from the input / output port of the mixer (characteristic C in FIG. 3). The reason is that a matching circuit is formed in the input / output portion of the mixer in order to improve the injection efficiency of the LO signal and optimize the conversion efficiency from the IF signal to the RF signal (not shown). This is because the impedance seen from the input / output port by the matching circuit changes according to the frequency. As a result, the DC voltage for applying the offset voltage also changes depending on this frequency, and the method of simply applying the DC voltage directly to the anti-parallel diode without detecting the 2fLO signal component suppresses unnecessary waves. The conclusion is difficult. As described above, detection of the 2fLO signal component is essential.
　ここで、特許文献２に記載された関連するハーモニックミキサ回路においては、この回路を受信器に用いることとしている。そうすると、所望信号ｆＩＦ＝ｆＲＦ－２ｆＬＯと不要波の対象である偶数次信号２ｆＬＯとは、周波数帯が離れている。そのため、両者はフィルタを使って容易に分離できる。 Here, in the related harmonic mixer circuit described in Patent Document 2, this circuit is used as a receiver. Then, the desired signal fIF = fRF−2fLO and the even-order signal 2fLO that is the target of the unwanted wave are separated from each other in frequency band. Therefore, both can be easily separated using a filter.
　その一方で、ハーモニックミキサ回路を送信器に用いる場合は、所望信号ｆＲＦ＝２ｆＬＯ＋ｆＩＦと不要波の対象である偶数次信号２ｆＬＯとは非常に近い周波数となる。これは、周波数関係において、通常、ｆＲＦ＞ｆＬＯ≫ｆＩＦとなる大小関係が成り立つからである。したがって、両者を分離することは困難である。不要波だけを精度よく検出することはフィルタを使ってもできない。そのため、関連するハーモニックミキサ回路を送信器に適用すると、不要波の発生を十分に抑制できず、ハーモニックミキサ回路の特性が劣化するという問題があった。 On the other hand, when the harmonic mixer circuit is used for the transmitter, the desired signal fRF = 2fLO + fIF and the even-order signal 2fLO that is the target of the unwanted wave have very close frequencies. This is because, in the frequency relationship, usually a magnitude relationship of fRF> fLO >> fIF is established. Therefore, it is difficult to separate them. Even if it uses a filter, it is impossible to accurately detect only unwanted waves. Therefore, when the related harmonic mixer circuit is applied to the transmitter, the generation of unnecessary waves cannot be sufficiently suppressed, and the characteristics of the harmonic mixer circuit are deteriorated.
　本発明の目的は、上述した課題である、ハーモニックミキサ回路を送信器に用いると、不要波の発生を抑制することが困難であり、ハーモニックミキサ回路の特性が劣化する、という課題を解決するハーモニックミキサ回路およびその制御方法を提供することにある。 An object of the present invention is to solve the above-described problem that when a harmonic mixer circuit is used in a transmitter, it is difficult to suppress the generation of unnecessary waves and the characteristics of the harmonic mixer circuit are deteriorated. It is to provide a mixer circuit and a control method thereof.
　本発明のハーモニックミキサ回路は、局部発信信号と中間周波信号を入力し、高周波信号を出力するメインミキサと、局部発信信号を入力し、リファレンス信号を出力するリファレンスミキサと、リファレンス信号を入力し、検知信号を出力する検知部と、検知信号に基づいて、バイアス電圧をメインミキサとリファレンスミキサとに付加する制御部、とを有する。 The harmonic mixer circuit of the present invention inputs a local oscillation signal and an intermediate frequency signal, outputs a high frequency signal, a main mixer, inputs a local oscillation signal, outputs a reference signal, and inputs a reference signal. A detection unit that outputs a detection signal; and a control unit that adds a bias voltage to the main mixer and the reference mixer based on the detection signal.
　また、本発明のハーモニックミキサ回路の制御方法は、メインミキサを用いて局部発振信号と中間周波信号を混合して、高周波信号を出力させ、リファレンスミキサを用いて局部発振信号の高調波信号を出力させ、高調波信号に基づいてバイアス電圧を決定し、バイアス電圧をメインミキサおよび前記リファレンスミキサに印加する。 In addition, the harmonic mixer circuit control method of the present invention mixes the local oscillation signal and the intermediate frequency signal using the main mixer, outputs the high frequency signal, and outputs the harmonic signal of the local oscillation signal using the reference mixer. The bias voltage is determined based on the harmonic signal, and the bias voltage is applied to the main mixer and the reference mixer.
　本発明のハーモニックミキサ回路およびその制御方法によれば、ハーモニックミキサ回路を送信器に用いた場合であっても、不要波の発生を抑制することができ、良好な特性を備えたハーモニックミキサ回路を得ることができる。 According to the harmonic mixer circuit and the control method thereof of the present invention, it is possible to suppress the generation of unnecessary waves even when the harmonic mixer circuit is used as a transmitter, and to provide a harmonic mixer circuit having good characteristics. Obtainable.
本発明の実施形態に係るハーモニックミキサ回路の構成を示すブロック図である。It is a block diagram which shows the structure of the harmonic mixer circuit which concerns on embodiment of this invention. 本発明の実施形態に係るハーモニックミキサ回路の構成を示すブロック図である。It is a block diagram which shows the structure of the harmonic mixer circuit which concerns on embodiment of this invention. アンチパラレルダイオードのＩ－Ｖ特性を示す図である。It is a figure which shows the IV characteristic of an antiparallel diode.
　以下に、図面を参照しながら、本発明の実施形態について説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
　図１は、本発明の実施形態に係るハーモニックミキサ回路の構成を示すブロック図である。本実施形態のハーモニックミキサ回路１００は、局部発信（ＬＯ）信号と中間周波（ＩＦ）信号を入力し、高周波（ＲＦ）信号を出力するメインミキサ１０と、ＬＯ信号を入力し、リファレンス信号を出力するリファレンスミキサ２０とを有する。さらに、リファレンス信号を入力し、検知信号を出力する検知部３０と、検知信号に基づいて、バイアス電圧をメインミキサ１０とリファレンスミキサ２０とに印加する制御部４０を有する。 FIG. 1 is a block diagram showing a configuration of a harmonic mixer circuit according to an embodiment of the present invention. The harmonic mixer circuit 100 of the present embodiment receives a local oscillation (LO) signal and an intermediate frequency (IF) signal, outputs a high frequency (RF) signal, inputs a LO signal, and outputs a reference signal. And a reference mixer 20. Furthermore, it has the detection part 30 which inputs a reference signal and outputs a detection signal, and the control part 40 which applies a bias voltage to the main mixer 10 and the reference mixer 20 based on a detection signal.
　リファレンスミキサ２０を用いる構成によって、不要波となる偶数次信号だけを精度よく検出することが可能となる。その結果、ハーモニックミキサ回路を送信器に用いた場合であっても、不要波の発生を抑制することができ、良好な特性を備えたハーモニックミキサ回路を得ることができる。 With the configuration using the reference mixer 20, it is possible to accurately detect only even-order signals that become unnecessary waves. As a result, even when the harmonic mixer circuit is used for the transmitter, the generation of unnecessary waves can be suppressed, and a harmonic mixer circuit having good characteristics can be obtained.
　次に、本実施形態によるハーモニックミキサ回路の構成について、図２を用いてさらに詳細に説明する。図２は、本発明の実施形態に係るハーモニックミキサ回路１００の構成を示すブロック図である。 Next, the configuration of the harmonic mixer circuit according to the present embodiment will be described in more detail with reference to FIG. FIG. 2 is a block diagram showing a configuration of the harmonic mixer circuit 100 according to the embodiment of the present invention.
　メインミキサ１０およびリファレンスミキサ２０の一端には、周波数ｆＬＯのＬＯ信号が入力されるＬＯ信号入力ポート１が接続される。メインミキサ１０の他端には、周波数ｆＩＦのＩＦ信号が入力されるＩＦ信号入力ポート２が接続される。さらに、メインミキサ１０には、周波数ｆＲＦのＲＦ信号が取り出されるＲＦ信号出力ポート３が接続される。 The LO signal input port 1 to which the LO signal having the frequency fLO is input is connected to one end of the main mixer 10 and the reference mixer 20. The other end of the main mixer 10 is connected to an IF signal input port 2 to which an IF signal having a frequency fIF is input. Further, the main mixer 10 is connected to an RF signal output port 3 from which an RF signal having a frequency fRF is extracted.
　一方、リファレンスミキサ２０の他端には、リファレンスミキサ２０を通過したＬＯ信号がリファレンス信号として取り出されるリファレンス信号出力ポート４が接続される。また、メインミキサ１０およびリファレンスミキサ２０には、制御部４０から出力されたバイアス電圧が印加される電圧印加ポート５が接続される。なお、ここまでの構成は同一の基板６０上に実装することが望ましい。 On the other hand, the other end of the reference mixer 20 is connected to a reference signal output port 4 from which the LO signal that has passed through the reference mixer 20 is taken out as a reference signal. The main mixer 10 and the reference mixer 20 are connected to a voltage application port 5 to which a bias voltage output from the control unit 40 is applied. It should be noted that the configuration described so far is desirably mounted on the same substrate 60.
　メインミキサ１０およびリファレンスミキサ２０は、２つのショットキーバリアダイオード１１、１２（２１、２２）が互いに極性が逆になるように並列接続されたアンチパラレルダイオードをそれぞれ備えた構成とすることができる。メインミキサ１０およびリファレンスミキサ２０のアンチパラレルダイオードは、同一の基板６０上に実装することで略同一の特性とすることができる。 The main mixer 10 and the reference mixer 20 can be configured to include anti-parallel diodes in which the two Schottky barrier diodes 11 and 12 (21 and 22) are connected in parallel so that their polarities are opposite to each other. The antiparallel diodes of the main mixer 10 and the reference mixer 20 can have substantially the same characteristics by being mounted on the same substrate 60.
　すなわち、ダイオードの製造バラツキに起因するメインミキサ１０およびリファレンスミキサ２０を構成するアンチパラレルダイオードの特性の差異を低減することができる。具体的には、ＬＯ信号入力ポート１、ＩＦ信号入力ポート２、ＲＦ信号出力ポート３、リファレンス信号出力ポート４、電圧印加ポート５、メインミキサ１０、リファレンスミキサ２０が同一の基板６０上に配置され、集積回路を構成している。 That is, the difference in the characteristics of the anti-parallel diodes constituting the main mixer 10 and the reference mixer 20 due to diode manufacturing variations can be reduced. Specifically, LO signal input port 1, IF signal input port 2, RF signal output port 3, reference signal output port 4, voltage application port 5, main mixer 10 and reference mixer 20 are arranged on the same substrate 60. Constitutes an integrated circuit.
　また、検知部３０は、リファレンスミキサ２０からの信号入力側に帯域通過フィルタ３２を備えた構成とすることができる。帯域通過フィルタ３２は、リファレンスミキサ２０から出力されるＬＯ信号の偶数次の高調波成分をリファレンス信号として通過させる。このような構成とすることにより、検知部３０は不要波成分のみを精度よく検知することができる。 Further, the detection unit 30 can be configured to include a band pass filter 32 on the signal input side from the reference mixer 20. The band pass filter 32 allows even-order harmonic components of the LO signal output from the reference mixer 20 to pass as a reference signal. By setting it as such a structure, the detection part 30 can detect only an unnecessary wave component accurately.
　検知部３０は、帯域通過フィルタ３２の後段に検波回路３１を備える構成とすることができる。検波回路３１は、帯域通過フィルタ３２を通過したリファレンス信号の包絡線検波を行い、検知信号として出力する。 The detection unit 30 can be configured to include a detection circuit 31 in the subsequent stage of the band pass filter 32. The detection circuit 31 performs envelope detection of the reference signal that has passed through the band-pass filter 32 and outputs it as a detection signal.
　制御部４０は、検波回路３１から検知信号を取得する。制御部４０は、検波回路３１が出力した検知信号を最小とするオフセット電圧を電圧出力ポート５に出力する。 The control unit 40 acquires a detection signal from the detection circuit 31. The control unit 40 outputs an offset voltage that minimizes the detection signal output from the detection circuit 31 to the voltage output port 5.
　次に、本発明の実施形態に係るハーモニックミキサ回路１００の動作について説明する。 Next, the operation of the harmonic mixer circuit 100 according to the embodiment of the present invention will be described.
　ＬＯ信号入力ポート１から入力されたＬＯ信号は等分配されて、メインミキサ１０とリファレンスミキサ２０に同振幅で入力されることが望ましい。また、メインミキサ１０には、ＩＦ信号入力ポート２から入力されたＩＦ信号が入力される。その結果、メインミキサ１０のＲＦ信号出力ポート３には周波数が次式で表されるＲＦ信号が発生する。 It is desirable that the LO signal input from the LO signal input port 1 is equally distributed and input to the main mixer 10 and the reference mixer 20 with the same amplitude. Further, the IF signal input from the IF signal input port 2 is input to the main mixer 10. As a result, an RF signal whose frequency is expressed by the following equation is generated at the RF signal output port 3 of the main mixer 10.
　ｆＲＦ＝ｍ×ｆＬＯ＋ｎ×ｆＩＦ
ここで、ｆＲＦはＲＦ信号の周波数、ｆＬＯはＬＯ信号の周波数、ｍおよびｎは任意の整数をそれぞれ表す。 fRF = m × fLO + n × fIF
Here, fRF represents the frequency of the RF signal, fLO represents the frequency of the LO signal, and m and n represent arbitrary integers.
　一方、リファレンスミキサ２０はＬＯ信号のみを入力する。この場合、リファレンス信号出力ポート４には、周波数がｍ×ｆＬＯ（＝ＬＯ、２ＬＯ、３ＬＯ…）のリファレンス信号が発生する。 On the other hand, the reference mixer 20 inputs only the LO signal. In this case, a reference signal having a frequency of m × fLO (= LO, 2LO, 3LO...) Is generated at the reference signal output port 4.
　なお、メインミキサ１０とリファレンスミキサ２０は、同一構造のアンチパラレルダイオードを用いて同一基板６０上に構成することにより、製造上生じる特性の個体バラつきを低減することができる。すなわち、メインミキサ１０およびリファレンスミキサ２０の周波数特性は略等しく、ＲＦ信号出力ポート３とリファレンス信号出力ポート４でのｍ×ｆＬＯ成分の出力は略同一となる。 The main mixer 10 and the reference mixer 20 are configured on the same substrate 60 using anti-parallel diodes having the same structure, thereby reducing individual variations in characteristics caused in manufacturing. That is, the frequency characteristics of the main mixer 10 and the reference mixer 20 are substantially equal, and the m × fLO component outputs at the RF signal output port 3 and the reference signal output port 4 are substantially the same.
　送信器に用いるハーモニックミキサ回路においては、所望ＲＦ信号の周波数ｆＲＦはｆＲＦ＝２ｆＬＯ＋ｆＩＦとなるように設定する。この場合、この所望ＲＦ信号の最も近傍に現れる不要波成分は、周波数が２ｆＬＯの成分である。 In the harmonic mixer circuit used for the transmitter, the frequency fRF of the desired RF signal is set to be fRF = 2fLO + fIF. In this case, the unnecessary wave component that appears closest to the desired RF signal is a component having a frequency of 2fLO.
　従って、リファレンス信号出力ポート４から出力されたリファレンス信号（ｍ×ｆＬＯ）のうち、偶数次の高調波成分のうち２ｆＬＯ成分のみを帯域通過フィルタ３２によって通過させる。２ｆＬＯ成分は検波回路３１により検波され、検知信号として包絡線電圧信号が検知部３０から出力される。制御部４０は、取得した検知信号を最小とするオフセット電圧を電圧印加ポート５に印加する。 Therefore, of the reference signal (m × fLO) output from the reference signal output port 4, only the 2fLO component of the even harmonic components is passed through the band pass filter 32. The 2fLO component is detected by the detection circuit 31, and an envelope voltage signal is output from the detection unit 30 as a detection signal. The control unit 40 applies an offset voltage that minimizes the acquired detection signal to the voltage application port 5.
　次に、本発明に係るハーモニックミキサ回路の制御方法について説明する。 Next, a method for controlling the harmonic mixer circuit according to the present invention will be described.
　まず、メインミキサ１０を用いてＬＯ信号とＩＦ信号を混合し、ＲＦ信号を出力させる。また、リファレンスミキサ２０を用いてＬＯ信号の高調波信号を出力させる。次に、高調波信号に基づいてバイアス電圧を決定し、バイアス電圧をメインミキサ１０およびリファレンスミキサ２０に印加する。 First, the LO signal and IF signal are mixed using the main mixer 10 to output an RF signal. Further, a harmonic signal of the LO signal is output using the reference mixer 20. Next, a bias voltage is determined based on the harmonic signal, and the bias voltage is applied to the main mixer 10 and the reference mixer 20.
　ここで、高調波信号のうち偶数次の高調波成分が最小になるようにバイアス電圧を決定するよう制御することができる。この場合、ＲＦ信号の周波数ｆＲＦは、ＬＯ信号の周波数ｆＬＯとＩＦ信号の周波数ｆＩＦの線形和（ｍ×ｆＬＯ＋ｎ×ｆＩＦ（ｍ、ｎは整数））である周波数とすることができる。これは、例えばアンチパラレルダイオードを用いるハーモニックミキサ回路によって実現することができる。 Here, it is possible to control to determine the bias voltage so that the even harmonic component of the harmonic signal is minimized. In this case, the frequency fRF of the RF signal can be a frequency that is a linear sum (m × fLO + n × fIF (m and n are integers)) of the frequency fLO of the LO signal and the frequency fIF of the IF signal. This can be realized by, for example, a harmonic mixer circuit using an anti-parallel diode.
　ここで、リファレンスミキサ２０の出力に含まれる偶数次の高調波成分についてその強度のバイアス電圧に対する依存性が、メインミキサ１０の出力に含まれる偶数次の混合波成分についてその強度のバイアス電圧に対する依存性と略等しくすることが望ましい。これは、例えば同一基板上に配置されたメインミキサ１０およびリファレンスミキサ２０を用いることによって実現することができる。 Here, the dependency of the even-order harmonic component included in the output of the reference mixer 20 on the bias voltage is dependent on the bias voltage of the even-order mixed wave component included in the output of the main mixer 10. It is desirable to be approximately equal to the sex. This can be realized, for example, by using the main mixer 10 and the reference mixer 20 arranged on the same substrate.
　また、バイアス電圧の決定は、高調波信号のうち偶数次の高調波信号を検波することにより包絡線電圧を取得し、この包絡線電圧が最小になるバイアス電圧を求めることにより行うことができる。これは、例えば、検波回路を用いることで実現することができる。 Also, the bias voltage can be determined by obtaining an envelope voltage by detecting even-order harmonic signals among the harmonic signals and obtaining a bias voltage at which the envelope voltage is minimized. This can be realized, for example, by using a detection circuit.
　以上述べたように、本実施形態によるハーモニックミキサ回路およびその制御方法によれば、ハーモニックミキサ回路を送信器に用いた場合であっても、不要波の発生を抑制することができ、良好な特性を備えたハーモニックミキサ回路を得ることができる。これは、リファレンスミキサ２０を用いることによって不要波成分のみを精度よく検知することが可能となるからである。 As described above, according to the harmonic mixer circuit and the control method thereof according to the present embodiment, even when the harmonic mixer circuit is used for a transmitter, it is possible to suppress the generation of unnecessary waves and have good characteristics. Can be obtained. This is because by using the reference mixer 20, it is possible to accurately detect only the unnecessary wave component.
　本発明は上記実施形態に限定されることなく、特許請求の範囲に記載した発明の範囲内で、種々の変形が可能であり、それらも本発明の範囲内に含まれるものであることはいうまでもない。 The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the invention described in the claims, and it is also included within the scope of the present invention. Not too long.
　この出願は、２０１２年８月２３日に出願された日本出願特願２０１２－１８４０８９を基礎とする優先権を主張し、その開示の全てをここに取り込む。 This application claims priority based on Japanese Patent Application No. 2012-184089 filed on August 23, 2012, the entire disclosure of which is incorporated herein.
　本発明は、例えば、送信器に用いられるハーモニックミキサ回路およびその制御方法などに利用可能である。 The present invention can be used for, for example, a harmonic mixer circuit used in a transmitter and a control method thereof.
　１　　ＬＯ信号入力ポート
　２　　ＩＦ信号入力ポート
　３　　ＲＦ信号出力ポート
　４　　リファレンス信号出力ポート
　５　　電圧印加ポート
　１０　　メインミキサ
　２０　　リファレンスミキサ
　１１、１２、２１、２２　　ショットキーバリアダイオード
　３０　　検知部
　３１　　検波回路
　３２　　帯域通過フィルタ
　４０　　制御部
　６０　　基板
　１００　　ハーモニックミキサ回路 DESCRIPTION OF SYMBOLS 1 LO signal input port 2 IF signal input port 3 RF signal output port 4 Reference signal output port 5 Voltage application port 10 Main mixer 20 Reference mixer 11, 12, 21, 22 Schottky barrier diode 30 Detector 31 Detection circuit 32 Band pass Filter 40 Control unit 60 Substrate 100 Harmonic mixer circuit

Claims (10)

  1. 　局部発信信号と中間周波信号を入力し、高周波信号を出力するメインミキサと、
    　前記局部発信信号を入力し、リファレンス信号を出力するリファレンスミキサと、
    　前記リファレンス信号を入力し、検知信号を出力する検知部と、
    　前記検知信号に基づいて、バイアス電圧を前記メインミキサと前記リファレンスミキサとに付加する制御部、とを有する
    ハーモニックミキサ回路。     A main mixer that inputs a local oscillation signal and an intermediate frequency signal and outputs a high frequency signal;
    A reference mixer for inputting the local transmission signal and outputting a reference signal;
    A detection unit that inputs the reference signal and outputs a detection signal;
    A harmonic mixer circuit comprising: a control unit that adds a bias voltage to the main mixer and the reference mixer based on the detection signal.
  2. 　前記検知部は帯域通過フィルタを備え、
    　前記帯域通過フィルタは、前記局部発振信号の偶数次の高調波成分を通過させる
    請求項１に記載したハーモニックミキサ回路。     The detection unit includes a band pass filter,
    The harmonic mixer circuit according to claim 1, wherein the band-pass filter passes even-order harmonic components of the local oscillation signal.
  3. 　前記メインミキサおよび前記リファレンスミキサは、２つのダイオードが互いに極性が逆になるように並列接続されたアンチパラレルダイオードをそれぞれ備え、
    　前記アンチパラレルダイオードは、略同一の特性を有する
    請求項１または２に記載したハーモニックミキサ回路。     The main mixer and the reference mixer each include an anti-parallel diode connected in parallel so that two diodes have opposite polarities,
    The harmonic mixer circuit according to claim 1, wherein the anti-parallel diodes have substantially the same characteristics.
  4. 　前記メインミキサおよび前記リファレンスミキサは、同一基板上に配置されている
    請求項１から３のいずれか一項に記載したハーモニックミキサ回路。     The harmonic mixer circuit according to any one of claims 1 to 3, wherein the main mixer and the reference mixer are arranged on the same substrate.
  5. 　前記検知部は、検波回路を備え、前記リファレンス信号の包絡線電圧信号を前記検知信号として出力する
    請求項１から４のいずれか一項に記載したハーモニックミキサ回路。     5. The harmonic mixer circuit according to claim 1, wherein the detection unit includes a detection circuit and outputs an envelope voltage signal of the reference signal as the detection signal. 6.
  6. 　メインミキサを用いて局部発振信号と中間周波信号を混合して高周波信号を出力させ、
    　リファレンスミキサを用いて前記局部発振信号の高調波信号を出力させ、
    　前記高調波信号に基づいてバイアス電圧を決定し、前記バイアス電圧を前記メインミキサおよび前記リファレンスミキサに印加する
    ハーモニックミキサ回路の制御方法。     Use the main mixer to mix the local oscillation signal and the intermediate frequency signal to output a high frequency signal,
    Output a harmonic signal of the local oscillation signal using a reference mixer,
    A method for controlling a harmonic mixer circuit, wherein a bias voltage is determined based on the harmonic signal, and the bias voltage is applied to the main mixer and the reference mixer.
  7. 　前記高調波信号のうち偶数次の高調波成分が最小になるようにバイアス電圧を決定する
    請求項６に記載したハーモニックミキサ回路の制御方法。     The method for controlling a harmonic mixer circuit according to claim 6, wherein a bias voltage is determined so that an even-order harmonic component of the harmonic signal is minimized.
  8. 　前記高周波信号の周波数は、前記局部発振信号の周波数と前記中間周波信号の周波数の線形和である
    請求項６または７に記載したハーモニックミキサ回路の制御方法。     The method of controlling a harmonic mixer circuit according to claim 6 or 7, wherein the frequency of the high-frequency signal is a linear sum of the frequency of the local oscillation signal and the frequency of the intermediate frequency signal.
  9. 　前記リファレンスミキサの出力に含まれる偶数次の高調波成分の強度の前記バイアス電圧に対する依存性が、前記メインミキサの出力に含まれる偶数次の混合波成分の強度の前記バイアス電圧に対する依存性と略等しい
    請求項６から８のいずれか一項に記載したハーモニックミキサ回路の制御方法。     The dependence of the intensity of even-order harmonic components contained in the output of the reference mixer on the bias voltage is substantially the same as the dependence of the intensity of even-order mixed wave components contained in the output of the main mixer on the bias voltage. The method for controlling a harmonic mixer circuit according to any one of claims 6 to 8, which is equal.
  10. 　前記バイアス電圧の決定は、偶数次の前記高調波信号を検波することにより包絡線電圧を取得し、前記包絡線電圧が最小になるバイアス電圧を求めることにより行う
    請求項６から９のいずれか一項に記載したハーモニックミキサ回路の制御方法。     The determination of the bias voltage is performed by obtaining an envelope voltage by detecting the even-order harmonic signal and obtaining a bias voltage that minimizes the envelope voltage. A control method of the harmonic mixer circuit described in the paragraph.
PCT/JP2013/004948 2012-08-23 2013-08-21 Harmonic mixer circuit and method for controlling same WO2014030350A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10209809A (en) * 1997-01-17 1998-08-07 Hitachi Ltd Filter circuit
JP2000341088A (en) * 1999-05-25 2000-12-08 Nec Yamagata Ltd Cr-correcting constant-current circuit
JP2001308647A (en) * 2000-04-21 2001-11-02 Nec Corp Harmonic mixer circuit and method for oppressing spurious waves

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10209809A (en) * 1997-01-17 1998-08-07 Hitachi Ltd Filter circuit
JP2000341088A (en) * 1999-05-25 2000-12-08 Nec Yamagata Ltd Cr-correcting constant-current circuit
JP2001308647A (en) * 2000-04-21 2001-11-02 Nec Corp Harmonic mixer circuit and method for oppressing spurious waves

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