JPH0556092A - Phase modulation circuit - Google Patents

Phase modulation circuit

Info

Publication number
JPH0556092A
JPH0556092A JP3211046A JP21104691A JPH0556092A JP H0556092 A JPH0556092 A JP H0556092A JP 3211046 A JP3211046 A JP 3211046A JP 21104691 A JP21104691 A JP 21104691A JP H0556092 A JPH0556092 A JP H0556092A
Authority
JP
Japan
Prior art keywords
modulation
signal
diode
voltage
circuit
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.)
Granted
Application number
JP3211046A
Other languages
Japanese (ja)
Other versions
JP2921194B2 (en
Inventor
Haruichi Arai
晴市 荒井
Akira Kato
章 加藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Priority to JP3211046A priority Critical patent/JP2921194B2/en
Publication of JPH0556092A publication Critical patent/JPH0556092A/en
Application granted granted Critical
Publication of JP2921194B2 publication Critical patent/JP2921194B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PURPOSE:To apply the phase modulation of low distortion even to a low level portion of a modulation signal by applying a bias voltage of a reverse polarity to a diode at a same period for the modulation signal. CONSTITUTION:A modulation signal is given to a roll-off filter (LPF), in which a base band signal used for a high frequency interruption is formed and it is given to a bias generating circuit 1 and an amplifier 3. A Schmitt circuit 11 of the bias generating circuit 1 shapes the signal into a rectangular wave, an inverter 12 inverts the polarity and the result is given to a modulation transformer T1. The amplifier 3 amplifies the signal and gives the result to an HF coil L1. Through the constitution above, a voltage -VF is applied to the modulation transformer T1 for periods t1-t2, a positive voltage is applied to a diode D2 via the HF coil L1 and a current flows to the diode. Similarly, a voltage +VF is applied to the transformer T1 for periods t2-t3, the diode D1 is active, a modulation output of a reverse phase is obtained and even when the modulation signal is small, phase modulation with low distortion is attained.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は位相変調回路に関し、
特に、ダイオードを用いて、変調信号に応じてマイクロ
波のような高周波(RF)信号を変調するSBM(一重
平衡型変調器)やDBM(二重平衡型変調器)のような
位相変調回路に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phase modulation circuit,
In particular, the present invention relates to a phase modulation circuit such as an SBM (single balanced modulator) or a DBM (double balanced modulator) that modulates a high frequency (RF) signal such as a microwave according to a modulation signal using a diode. ..

【0002】[0002]

【従来の技術】図5は従来のSBM型BPSK(Bin
ary Phase Shift Keying)変調
回路の電気回路図である。図5を参照して、RF信号は
トリファイラ巻された変調トランスT1に入力され、変
調信号は高周波コイル(RFC)L1を介してダイオー
ドD1のアノードとダイオードD2のカソードに入力さ
れる。ダイオードD1のアノードとダイオードD2のカ
ソードは変調トランスT1に接続される。ダイオードD
1のカソードとダイオードD2のアノードはコンデンサ
C1の一端に接続され、コンデンサC1の他端から変調
RF信号が出力される。
2. Description of the Related Art FIG. 5 shows a conventional SBM type BPSK (Bin
It is an electric circuit diagram of an ary phase shift keying modulation circuit. Referring to FIG. 5, the RF signal is input to the modulation transformer T1 wound in a trifilar manner, and the modulation signal is input to the anode of the diode D1 and the cathode of the diode D2 via the radio frequency coil (RFC) L1. The anode of the diode D1 and the cathode of the diode D2 are connected to the modulation transformer T1. Diode D
The cathode of 1 and the anode of the diode D2 are connected to one end of the capacitor C1, and the modulated RF signal is output from the other end of the capacitor C1.

【0003】図6は従来のDBM型BPSK変調回路の
電気回路図である。図6を参照して、2つの変調トラン
スT1とT2との間にダイオードD1〜D4がブリッジ
接続され、変調トランスT2に変調信号が入力される
と、変調トランスT1に入力された高周波信号が変調さ
れ、変調トランスT2から変調RF信号が出力される。
FIG. 6 is an electric circuit diagram of a conventional DBM type BPSK modulation circuit. Referring to FIG. 6, when diodes D1 to D4 are bridge-connected between two modulation transformers T1 and T2 and a modulation signal is input to modulation transformer T2, the high frequency signal input to modulation transformer T1 is modulated. Then, a modulation RF signal is output from the modulation transformer T2.

【0004】[0004]

【発明が解決しようとする課題】図7は図5および図6
に示したダイオードの電圧−電流特性を示す図である。
図7に示すように、ダイオードの順方向特性は電圧の立
上がり部分(VF )では、電流が僅かしか流れず、信号
の小さい部分では非線型になるという特性がある。この
ため、図5および図6に示した変調回路においては、変
調信号としてのベースバンド信号の入力が小さい場合、
変調RF信号に歪が多く発生するという問題点があっ
た。
FIG. 7 is a schematic diagram of FIG. 5 and FIG.
It is a figure which shows the voltage-current characteristic of the diode shown in FIG.
As shown in FIG. 7, the forward characteristics of the diode in the rising portion of the voltage (V F), a current only flows slightly, a small portion of the signal has the characteristic that becomes non-linear. Therefore, in the modulation circuit shown in FIGS. 5 and 6, when the input of the baseband signal as the modulation signal is small,
There is a problem that a lot of distortion occurs in the modulated RF signal.

【0005】それゆえに、この発明の主たる目的は、ダ
イオードに、その立上がり電圧分だけ逆バイアスをかけ
て小信号でも低歪の位相変調をかけることのできるよう
な位相変調回路を提供することである。
Therefore, a main object of the present invention is to provide a phase modulation circuit in which a diode is reverse-biased by a rising voltage of the diode and a low distortion phase modulation can be performed even with a small signal. ..

【0006】[0006]

【課題を解決するための手段】この発明はダイオードを
用いた位相変調回路において、変調信号と同じ周期で逆
極性のバイアス電圧をダイオードに印加し、それによっ
て歪を低減するように構成される。
According to the present invention, in a phase modulation circuit using a diode, a bias voltage of opposite polarity is applied to the diode at the same cycle as the modulation signal, thereby reducing distortion.

【0007】[0007]

【作用】この発明に係る位相変調回路は、変調信号と同
じ周期で逆極性のバイアス電圧をダイオードに印加する
ことによって、ダイオードに順バイアスをかけることが
でき、変調信号の小さい部分でも十分に変調をかけるこ
とができ、歪を低減できる。
In the phase modulation circuit according to the present invention, a forward bias can be applied to the diode by applying a bias voltage of the opposite polarity to the diode at the same period as the modulation signal, and even a small portion of the modulation signal can be sufficiently modulated. Can be applied and distortion can be reduced.

【0008】[0008]

【発明の実施例】図1はこの発明の一実施例の電気回路
図であり、図2は図1に示したバイアス発生回路の一例
を示す図である。
1 is an electric circuit diagram of an embodiment of the present invention, and FIG. 2 is a diagram showing an example of the bias generation circuit shown in FIG.

【0009】図1を参照して、変調信号はロールオフフ
ィルタ(ローパスフィルタ)に与えられ、帯域制限され
て高域が遮断されたベースバンド信号となり、バイアス
発生回路1とアンプ3とに与えられる。バイアス発生回
路1は図2に示すように、シュミット回路11とインバ
ータ12とを直列接続して構成される。シュミット回路
11は入力されたベースバンド信号を矩型波に波形整形
し、インバータ12はその極性を反転して変調トランス
T1に与える。アンプ3はベースバンド信号を増幅し、
高周波コイルL1に与える。
Referring to FIG. 1, the modulated signal is applied to a roll-off filter (low-pass filter), becomes a baseband signal whose band is limited and high frequencies are cut off, and is applied to bias generation circuit 1 and amplifier 3. .. As shown in FIG. 2, the bias generation circuit 1 is configured by connecting a Schmitt circuit 11 and an inverter 12 in series. The Schmitt circuit 11 waveform-shapes the input baseband signal into a rectangular wave, and the inverter 12 inverts its polarity and gives it to the modulation transformer T1. The amplifier 3 amplifies the baseband signal,
It is applied to the high frequency coil L1.

【0010】図3は図1の各部の波形図である。次に、
図1〜図3を参照して、この発明の一実施例の動作につ
いて説明する。変調信号はロールオフフィルタ2によっ
て帯域制限され、図3(a)に示すようなベースバンド
信号がバイアス発生回路1とアンプ3とに与えられる。
バイアス発生回路1はシュミット回路11が図3(a)
に示すベースバンド信号を波形整形し、矩型波にした
後、インバータ12がその極性を反転し、図3(c)に
示す信号を変調トランスT1に与える。
FIG. 3 is a waveform diagram of each part of FIG. next,
The operation of the embodiment of the present invention will be described with reference to FIGS. The modulation signal is band-limited by the roll-off filter 2, and a baseband signal as shown in FIG. 3A is given to the bias generation circuit 1 and the amplifier 3.
In the bias generation circuit 1, the Schmitt circuit 11 is shown in FIG.
After the waveform of the baseband signal shown in FIG. 3 is shaped into a rectangular wave, the inverter 12 inverts its polarity and gives the signal shown in FIG. 3C to the modulation transformer T1.

【0011】一方、アンプ3はロールオフフィルタ2に
よって帯域制限されたベースバンド信号を図3(b)に
示すように増幅し、高周波コイルL1に与える。ここ
で、図3(c)に示すt1 〜t8 の期間について考えて
みる。t1 <t<t2 の期間では、変調トランスT1に
−VF の電圧が印加され、高周波コイルL1を介してダ
イオードD2には図3(b)に示す正の電圧が印加され
る。このため、ダイオードD2に印加される電圧に比例
して電流が流れる。これは変調信号を出力する変調信号
源(図示せず)が内部抵抗を持っており、また、故意に
抵抗を直列接続することによってダイオードD2の立上
がりのエキスポテンシャルカーブにより信号源の内部抵
抗が高く、これに律せられるからである。同様にして、
2 <t<t3 では変調トランスT1にVF の電圧が印
加されるのでダイオードD1が作動し、前述と逆位相の
信号が変調出力となる。なお、図1の高周波コイルL1
に代えて抵抗を接続するようにしてもよい。
On the other hand, the amplifier 3 amplifies the baseband signal whose band is limited by the roll-off filter 2 as shown in FIG. 3B, and supplies it to the high frequency coil L1. Here, consider the period from t 1 to t 8 shown in FIG. In the period of t 1 <t <t 2, the voltage of -V F is applied to the modulation transformer T1, the diode D2 via the high-frequency coil L1 positive voltage shown in FIG. 3 (b) is applied. Therefore, a current flows in proportion to the voltage applied to the diode D2. This is because a modulation signal source (not shown) that outputs a modulation signal has an internal resistance, and by intentionally connecting the resistances in series, the internal resistance of the signal source becomes high due to the rising potential curve of the diode D2. , Because of this. Similarly,
When t 2 <t <t 3 , a voltage of V F is applied to the modulation transformer T1, so that the diode D1 operates and a signal having a phase opposite to the above is a modulation output. The high frequency coil L1 of FIG.
Instead of this, a resistor may be connected.

【0012】上述のごとく、ダイオードD1に対してV
F のバイアス電圧を与え、ダイオードD2に対して−V
F のバイアス電圧を与えるようにしたので、変調信号が
小さい場合であっても低歪で位相変調することができ
る。
As described above, V is applied to the diode D1.
Apply F bias voltage and -V to diode D2
Since the bias voltage of F is applied, the phase modulation can be performed with low distortion even when the modulation signal is small.

【0013】なお、上述の説明では、この発明をSBM
型BPSK変調回路に適用したが、これに限ることな
く、図6に示したDBM型BPSK変調回路に適用して
もよい。その場合には、バイアス発生回路1の出力が正
のときには、図6に示すダイオードD1,D2に電流が
流れ、逆極性のときにはダイオードD3,D4に電流が
流れる。
In the above description, the present invention is SBM.
However, the present invention is not limited to this and may be applied to the DBM type BPSK modulation circuit shown in FIG. In that case, when the output of the bias generation circuit 1 is positive, current flows through the diodes D1 and D2 shown in FIG. 6, and when the output has the opposite polarity, current flows through the diodes D3 and D4.

【0014】図4はこの発明をDBM型BPSK変調回
路に適用した場合の全体の概略ブロック図である。この
図4に示したブロック図は、テレビ信号のI信号とQ信
号を変調する。このため、I信号はバイアス発生回路2
1とアンプ22とに与えられ、Q信号はバイアス発生回
路23とアンプ24とに与えられる。バイアス発生回路
21,23およびアンプ22,24の出力はQPSK変
調回路30に与えられる。QPSK変調回路30はBP
SK変調器32,33と3dB90°ハイブリッド31
と3dB0°ハイブリッド34とを含む。高周波信号源
25からのRF信号は抵抗26を介して3dB90°ハ
イブリッド31に与えられ、それぞれの位相が90°ず
らされたRF信号がBPSK変調器32と33とに与え
られる。BPSK変調器32,33は前述の説明のごと
く、バイアス発生回路21,22によって逆バイアスが
かけられ、I信号とQ信号とによって位相変調される。
BPSK変調器32,33の出力は、それぞれ90°の
位相を保った状態で3dB0°ハイブリッド34によっ
て合成されて出力される。
FIG. 4 is an overall schematic block diagram when the present invention is applied to a DBM type BPSK modulation circuit. The block diagram shown in FIG. 4 modulates the I and Q signals of a television signal. Therefore, the I signal is the bias generation circuit 2
1 and the amplifier 22, and the Q signal is supplied to the bias generation circuit 23 and the amplifier 24. The outputs of the bias generation circuits 21 and 23 and the amplifiers 22 and 24 are given to the QPSK modulation circuit 30. The QPSK modulation circuit 30 is BP
SK modulators 32 and 33 and 3 dB 90 ° hybrid 31
And a 3 dB 0 ° hybrid 34. The RF signal from the high frequency signal source 25 is given to the 3 dB 90 ° hybrid 31 via the resistor 26, and the RF signals whose phases are shifted by 90 ° are given to the BPSK modulators 32 and 33. As described above, the BPSK modulators 32 and 33 are reverse-biased by the bias generation circuits 21 and 22 and are phase-modulated by the I signal and the Q signal.
The outputs of the BPSK modulators 32 and 33 are combined and output by the 3 dB 0 ° hybrid 34 while maintaining the phase of 90 °.

【0015】このように、QPSK変調回路30に対し
て、バイアス発生回路21,23からバイアス電圧を与
えることによって、RF信号に対して歪の少ない位相変
調をかけることができる。
As described above, by applying the bias voltage from the bias generation circuits 21 and 23 to the QPSK modulation circuit 30, phase modulation with less distortion can be applied to the RF signal.

【0016】なお、図4においても、図1と同様にして
ロールオフフィルタを前段に接続するようにしてもよ
い。このようなロールオフフィルタやバイアス発生回路
は、オペアンプで容易に実現でき、QPSK変調回路3
0とともに容易に同一基板に実装できる。
Note that, also in FIG. 4, the roll-off filter may be connected to the preceding stage in the same manner as in FIG. Such a roll-off filter and bias generation circuit can be easily realized by an operational amplifier, and the QPSK modulation circuit 3
It can be easily mounted on the same board together with 0.

【0017】[0017]

【発明の効果】以上のように、この発明によれば、変調
信号と同じ周期で逆極性のバイアス電圧をダイオードに
印加するようにしたので、変調信号のレベルの低い部分
でも低歪の位相の変調をかけることができる。
As described above, according to the present invention, since the bias voltage of the opposite polarity is applied to the diode in the same cycle as the modulation signal, the phase of low distortion is obtained even in the low level portion of the modulation signal. Modulation can be applied.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の一実施例の電気回路図である。FIG. 1 is an electric circuit diagram of an embodiment of the present invention.

【図2】図1に示したバイアス発生回路の一例を示す図
である。
FIG. 2 is a diagram showing an example of a bias generation circuit shown in FIG.

【図3】図1の各部の波形図である。FIG. 3 is a waveform diagram of each part of FIG.

【図4】この発明をDBM型QPSK変調回路に適用し
た場合の全体の概略ブロック図である。
FIG. 4 is an overall schematic block diagram when the present invention is applied to a DBM type QPSK modulation circuit.

【図5】従来のSBM型BPSK変調回路の電気回路図
である。
FIG. 5 is an electric circuit diagram of a conventional SBM type BPSK modulation circuit.

【図6】従来のDBM型BPSK変調回路の電気回路図
である。
FIG. 6 is an electric circuit diagram of a conventional DBM type BPSK modulation circuit.

【図7】図7は図5および図6に示したダイオードの電
圧−電流特性を示す図である。
7 is a diagram showing voltage-current characteristics of the diode shown in FIGS. 5 and 6. FIG.

【符号の説明】[Explanation of symbols]

1,21,23 バイアス発生回路 2 ロールオフフィルタ 3,22,24 アンプ 11 シュミット回路 12 インバータ 30 QPSK変調回路 31 3dB90°ハイブリッド 32,33 BPSK変調器 34 3dB0°ハイブリッド 1,2,23 Bias generation circuit 2 Roll-off filter 3,22,24 Amplifier 11 Schmitt circuit 12 Inverter 30 QPSK modulation circuit 31 3 dB 90 ° hybrid 32,33 BPSK modulator 34 3 dB 0 ° hybrid

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 ダイオードを用いた位相変調回路におい
て、 変調信号と同じ周期で逆極性のバイアス電圧をダイオー
ドに印加し、それによって歪を低減することを特徴とす
る、位相変調回路。
1. A phase modulation circuit using a diode, wherein a bias voltage of the opposite polarity is applied to the diode at the same cycle as the modulation signal, thereby reducing distortion.
JP3211046A 1991-08-22 1991-08-22 Phase modulation circuit Expired - Fee Related JP2921194B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3211046A JP2921194B2 (en) 1991-08-22 1991-08-22 Phase modulation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3211046A JP2921194B2 (en) 1991-08-22 1991-08-22 Phase modulation circuit

Publications (2)

Publication Number Publication Date
JPH0556092A true JPH0556092A (en) 1993-03-05
JP2921194B2 JP2921194B2 (en) 1999-07-19

Family

ID=16599488

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3211046A Expired - Fee Related JP2921194B2 (en) 1991-08-22 1991-08-22 Phase modulation circuit

Country Status (1)

Country Link
JP (1) JP2921194B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0795251A (en) * 1993-09-24 1995-04-07 Nec Corp Phase modulator in microwave band

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52100864A (en) * 1976-02-20 1977-08-24 Oki Electric Ind Co Ltd Pulse modulation circuit
JPS6113733A (en) * 1984-06-29 1986-01-22 Nec Home Electronics Ltd Carrier wave suppression method for psk modulation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52100864A (en) * 1976-02-20 1977-08-24 Oki Electric Ind Co Ltd Pulse modulation circuit
JPS6113733A (en) * 1984-06-29 1986-01-22 Nec Home Electronics Ltd Carrier wave suppression method for psk modulation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0795251A (en) * 1993-09-24 1995-04-07 Nec Corp Phase modulator in microwave band

Also Published As

Publication number Publication date
JP2921194B2 (en) 1999-07-19

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