JPS6355805B2 - - Google Patents
Info
- Publication number
- JPS6355805B2 JPS6355805B2 JP56113322A JP11332281A JPS6355805B2 JP S6355805 B2 JPS6355805 B2 JP S6355805B2 JP 56113322 A JP56113322 A JP 56113322A JP 11332281 A JP11332281 A JP 11332281A JP S6355805 B2 JPS6355805 B2 JP S6355805B2
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- output
- signal
- output terminal
- impedance
- 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.)
- Expired
Links
- 230000003321 amplification Effects 0.000 description 6
- 238000003199 nucleic acid amplification method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
Landscapes
- Amplifiers (AREA)
Description
【発明の詳細な説明】
本発明は、フイードホワード増幅器の効率を向
上に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improving the efficiency of feedforward amplifiers.
最近第１図の様なフイードホワード増幅器が考
えられている。図において第１の増幅器２の入力
端子は、入力端子１に接続すると共に第２の増幅
器４の非反転入力端子に接続し、出力端子は第１
のインピーダンス６を介して出力端子８に接続す
ると共に減衰器３を介して第２の増幅器４の反転
入力端子に接続する。第３の増幅器５の入力端子
は第２の増幅器４の出力端子に接続し、出力端子
は第２のインピーダンス７を介して出力端子８に
接続する。出力端子８は負荷抵抗９を介して接地
する。以上の構成に於いて、非線形な増幅度をも
つ第１の増幅器２の特性によつて発生した歪み
を、第２の増幅器４で取り出し、第３の増幅器５
で増幅し、第１のインピーダンス６と第２のイン
ピーダンス７で前記歪み成分を逆相で合成して打
消し、出力端子８には歪みの無い出力信号が得ら
れる様に動作する。 Recently, a feedforward amplifier as shown in FIG. 1 has been considered. In the figure, the input terminal of the first amplifier 2 is connected to the input terminal 1 and the non-inverting input terminal of the second amplifier 4, and the output terminal is connected to the first amplifier 4.
It is connected to the output terminal 8 through the impedance 6 of the amplifier 3 and to the inverting input terminal of the second amplifier 4 through the attenuator 3 . The input terminal of the third amplifier 5 is connected to the output terminal of the second amplifier 4, and the output terminal is connected to the output terminal 8 via the second impedance 7. The output terminal 8 is grounded via a load resistor 9. In the above configuration, the distortion generated due to the characteristics of the first amplifier 2 having a nonlinear amplification degree is extracted by the second amplifier 4, and the distortion generated by the characteristic of the first amplifier 2, which has a nonlinear amplification degree, is extracted by the second amplifier 4, and the distortion is extracted by the third amplifier 5.
The first impedance 6 and the second impedance 7 combine and cancel the distortion components in opposite phases, so that an output signal without distortion is obtained at the output terminal 8.
しかし、上述に於いて第３の増幅器５は第１の
増幅器２で発生する歪み成分を扱つているのだか
ら、第３の増幅器５の出力端子には信号成分は含
まれていない。即ち、入力端子１に印加される入
力信号をe1とし、第１の増幅器２の増幅度を線形
成分と非線形成分に分けて、無歪成分をA1、歪
み成分をＤとし、減衰器３の減衰比を１／Ｋ、第
２の増幅度とA2、第３の増幅器５の増幅度をA3、
第１及び第２のインピーダンス６及び７のインピ
ーダンス値をそれぞれZ1及びZ2とすると、第３の
増幅器５の出力端子の出力レベルe5は
e5＝｛e1−（A1＋Ｄ）e1／Ｋ｝A2A3 ……(1)
ここでA1＝Ｋ＝A2とすると
e5＝−DA3e1 ……(2)
そして、第１の増幅器２の出力端子の出力レベ
ルe2は
e2＝A1e1＋De1 ……(3)
従つて
A3＝Z2／Z1 ……(4)
とすることによつて、第１の増幅器２から発生す
る歪み成分（De1）が除去されて、出力端子８に
は歪みの無い出力信号が得られるが、上述の式(2)
に示す様に、第３の増幅器５の出力端子のレベル
は歪み成分のみで信号成分で見れば接地電位に等
しくなるから、第１の増幅器２の大きな出力信号
が第１のインピーダンス６を経て負荷抵抗９と第
２のインピーダンス７に分流されることになり、
負荷抵抗９のインピーダンス値と、第２のインピ
ーダンス７のインピーダンス値の割合によつて前
記第１の増幅器の出力信号の一部が第３の増幅器
５の出力端子に流入し、該第３の増幅器５は大き
な発熱を伴うことになり、又この出力電力の損失
によつて第１の増幅器２の出力電力を負荷抵抗９
に効率良く供給することが出来ず、第１及び第３
の増幅器共に大型なものとなつてしまい極めて不
経済でもある。この様な電力損失を減少させるた
めには、第２のインピーダンス７のインピーダン
ス値を負荷抵抗９のインピーダンス値に比べて充
分に大きな値とすれば良いが、反面前記の式(4)に
示す如く、歪みを打消す為の第３の増幅器５の出
力振幅を大きく（A3を大きく）する必要が生じ、
該第３の増幅器５の電源電圧を非常に大きな電圧
にしなければならない欠点を生じる。 However, in the above description, since the third amplifier 5 handles the distortion component generated in the first amplifier 2, the output terminal of the third amplifier 5 does not contain any signal component. That is, the input signal applied to the input terminal 1 is e1 , the amplification degree of the first amplifier 2 is divided into a linear component and a nonlinear component, the non-distortion component is A1 , the distortion component is D, and the attenuator 3 The attenuation ratio of is 1/K, the second amplification degree is A 2 , the amplification degree of the third amplifier 5 is A 3 ,
If the impedance values of the first and second impedances 6 and 7 are Z 1 and Z 2 respectively, the output level e 5 of the output terminal of the third amplifier 5 is e 5 = {e 1 − (A 1 +D) e 1 /K}A 2 A 3 ... (1) Here, if A 1 = K = A 2 , e 5 = -DA 3 e 1 ... (2) And the output level of the output terminal of the first amplifier 2 e 2 is e 2 = A 1 e 1 + De 1 ... (3) Therefore, A 3 = Z 2 /Z 1 ... (4) By setting e 2 as e 2 = A 1 e 1 + De 1 ... (4), the distortion component generated from the first amplifier 2 ( De 1 ) is removed, and a distortion-free output signal is obtained at the output terminal 8, but the above equation (2)
As shown in , since the level of the output terminal of the third amplifier 5 is only a distortion component and is equal to the ground potential in terms of signal components, the large output signal of the first amplifier 2 passes through the first impedance 6 to the load. The current will be shunted to the resistor 9 and the second impedance 7,
Depending on the ratio of the impedance value of the load resistor 9 and the impedance value of the second impedance 7, a part of the output signal of the first amplifier flows into the output terminal of the third amplifier 5, and the third amplifier 5 will be accompanied by large heat generation, and due to this output power loss, the output power of the first amplifier 2 will be reduced to the load resistance 9.
could not be efficiently supplied to the first and third
Both amplifiers are large, making it extremely uneconomical. In order to reduce such power loss, the impedance value of the second impedance 7 should be set to a sufficiently large value compared to the impedance value of the load resistor 9, but on the other hand, as shown in the above equation (4), , it becomes necessary to increase the output amplitude of the third amplifier 5 (increase A 3 ) in order to cancel the distortion,
This results in a drawback that the power supply voltage of the third amplifier 5 must be made very large.
本発明は、上述の様な欠点を改善した効率の良
いフイードホワード増幅器を提供するものであ
る。 The present invention provides an efficient feedforward amplifier that overcomes the above-mentioned drawbacks.
第２図に本発明の一実施例を示す。図に於いて
第１図と異なる点は、入力端子１に印加された入
力信号を減衰器１０で減衰した後第４の増幅器１
１で増幅して、その出力と第３の増幅器５の入力
信号に加算器１２により加算したところだけであ
るので、前記第１図と同一機能を有する部分は同
一符号を付してその詳細な説明を省略するも、減
衰器１０の減衰比を１／ｋとし、第４の増幅器１
１の増幅度をA4とすると、該第４の増幅器１１
の出力端子のレベルe11は
e11＝１／ｋ・A4e1
従つて、第３の増幅器５の出力端子のレベル
e5′は
e5′＝１／ｋA3A4e1−DA3e1 ……(5)
ここで上式(5)の信号成分のレベルを出力端子８
の出力信号レベルe8と等しくなる様に、減衰器１
０と第４の増幅器１１とで
e3＝R9／Z1＋R9・A1e1＝１／ｋA3A4e1 ……(6)
となる様に設定すれば、出力端子８と第３の増幅
器５の出力端子のレベルは信号成分により同相同
レベルで駆動されるから、第３の増幅器５に対し
て第１の増幅器２の大きな出力信号は流入しなく
なり、第２のインピーダンス７に流れる電流値i7
は
i7＝−De1／Z7 ……(7)
の歪み成分だけの小さな電流値となる。従つて、
第１の増幅器２の出力電力は第３の増幅器５で損
失することなく、効率良く負荷抵抗９に供給され
る。 FIG. 2 shows an embodiment of the present invention. The difference between the figure and FIG. 1 is that after the input signal applied to the input terminal 1 is attenuated by the attenuator 10, the fourth amplifier 1
1, and the output thereof and the input signal of the third amplifier 5 are added by the adder 12. Therefore, the parts having the same functions as those in FIG. Although the explanation is omitted, the attenuation ratio of the attenuator 10 is 1/k, and the fourth amplifier 1
If the amplification degree of 1 is A4 , the fourth amplifier 11
The level e 11 of the output terminal of is e 11 = 1/k・A 4 e 1 Therefore, the level of the output terminal of the third amplifier 5 is
e 5 ′ is e 5 ′=1/kA 3 A 4 e 1 −DA 3 e 1 ……(5) Here, the level of the signal component in the above equation (5) is expressed as output terminal 8.
Attenuator 1 so that the output signal level e is equal to 8
0 and the fourth amplifier 11 so that e 3 = R 9 /Z 1 + R 9 · A 1 e 1 = 1/kA 3 A 4 e 1 ...(6), the output terminal 8 and Since the level of the output terminal of the third amplifier 5 is driven by the signal component at the same phase and the same level, the large output signal of the first amplifier 2 does not flow into the third amplifier 5, and the second impedance 7 Current value i 7
becomes a small current value with only the distortion component of i 7 = −De 1 /Z 7 (7). Therefore,
The output power of the first amplifier 2 is efficiently supplied to the load resistor 9 without loss in the third amplifier 5.
この様に、本発明によれば出力電力は効率良く
負荷に供給されるから、第１の増幅器２も出力電
力に応じた必要最小限の小型な増幅器でも良く、
第３の増幅器５も同様に小型な増幅器でも良い。 In this way, according to the present invention, the output power is efficiently supplied to the load, so the first amplifier 2 may also be a small amplifier with the minimum necessary size according to the output power.
The third amplifier 5 may also be a small amplifier.
尚本発明の第２図の実施例に於いて、第３の増
幅器５の出力レベルが出力端子８の信号レベルに
等しくなる様に設定出来るならば、減衰器１０を
省略してもかまわないことはもちろんである。 In the embodiment of FIG. 2 of the present invention, if the output level of the third amplifier 5 can be set to be equal to the signal level of the output terminal 8, the attenuator 10 may be omitted. Of course.
第１図は本発明を適要出来る増幅器の一例を示
す回路図、第２図は本発明の一実施例を示す回路
図である。
図中２，４及び５はそれぞれ第１、第２及び第
３の増幅器、６及び７は第１及び第２のインピー
ダンス、９は負荷抵抗である。
FIG. 1 is a circuit diagram showing an example of an amplifier to which the present invention can be applied, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. In the figure, 2, 4 and 5 are first, second and third amplifiers, respectively, 6 and 7 are first and second impedances, and 9 is a load resistance.
Claims (1)
の増幅器の出力信号と前記入力信号との差信号を
増幅する第２の増幅器と、該第２の増幅器の出力
信号と前記入力信号との和信号を増幅する第３の
増幅器から成り、前記第１及び第３の増幅器の出
力信号をそれぞれ第１及び第２のインピーダンス
を介して負荷に供給するものとし、前記第３の増
幅器の出力信号の位相及びレベルを前記負荷端の
出力信号とほぼ合わせることを特徴とする増幅
器。1 a first amplifier that amplifies an input signal;
a second amplifier that amplifies the difference signal between the output signal of the amplifier and the input signal; and a third amplifier that amplifies the sum signal of the output signal of the second amplifier and the input signal. The output signals of the first and third amplifiers are supplied to the load via the first and second impedances, respectively, and the phase and level of the output signal of the third amplifier are approximately matched with the output signal of the load end. An amplifier characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56113322A JPS5814609A (en) | 1981-07-20 | 1981-07-20 | Amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56113322A JPS5814609A (en) | 1981-07-20 | 1981-07-20 | Amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5814609A JPS5814609A (en) | 1983-01-27 |
| JPS6355805B2 true JPS6355805B2 (en) | 1988-11-04 |
Family
ID=14609288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56113322A Granted JPS5814609A (en) | 1981-07-20 | 1981-07-20 | Amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5814609A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2022528276A (en) * | 2019-04-02 | 2022-06-09 | クウォンタルエアエフ アーゲー | Radio Frequency Power Amplifier System and How to Linearize Its Output Signals |
| US11979114B2 (en) | 2020-09-28 | 2024-05-07 | QuantalRF AG | Amplifier including magnetically coupled feedback loop and stacked input and output stages adapted for DC current reuse |
| US12149216B2 (en) | 2021-02-09 | 2024-11-19 | QuantalRF AG | System and method for adjusting amplifier bias using envelope tracking |
| US12355428B2 (en) | 2022-08-31 | 2025-07-08 | QuantaIRF AG | System and method for integrated filtering and amplification |
| US12424976B2 (en) | 2021-02-09 | 2025-09-23 | QuantalRF AG | System and method for adjusting amplifier bias current based on input signal envelope tracking |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6198385A (en) * | 1984-10-19 | 1986-05-16 | 三洋電機株式会社 | Display controller |
| JP2007134847A (en) * | 2005-11-09 | 2007-05-31 | Nagano Japan Radio Co | Amplifier |
| JP2007134849A (en) * | 2005-11-09 | 2007-05-31 | Nagano Japan Radio Co | Amplifier |
-
1981
- 1981-07-20 JP JP56113322A patent/JPS5814609A/en active Granted
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12052004B2 (en) | 2019-04-02 | 2024-07-30 | QuantaIRF AG | Radio frequency power amplifier system and method of linearizing an output signal thereof |
| JP2025013697A (en) * | 2019-04-02 | 2025-01-24 | クウォンタルエアエフ アーゲー | Radio frequency power amplifier system and method for linearizing its output signal - Patents.com |
| JP2022528276A (en) * | 2019-04-02 | 2022-06-09 | クウォンタルエアエフ アーゲー | Radio Frequency Power Amplifier System and How to Linearize Its Output Signals |
| US12160203B2 (en) | 2020-09-28 | 2024-12-03 | QuantalRF AG | Amplifier linearization using magnetically coupled feedback provided by a transformer coupled to a balun-based load |
| US12149210B2 (en) | 2020-09-28 | 2024-11-19 | QuantalRF AG | Amplifier linearization using magnetically coupled feedback |
| US12034411B2 (en) | 2020-09-28 | 2024-07-09 | QuantalRF AG | Method of improving linearity of amplifier circuit including magnetically coupled feedback loop and DC bias current adjustment without impacting amplifier gain |
| US11979114B2 (en) | 2020-09-28 | 2024-05-07 | QuantalRF AG | Amplifier including magnetically coupled feedback loop and stacked input and output stages adapted for DC current reuse |
| US12278599B2 (en) | 2020-09-28 | 2025-04-15 | QuantalRF AG | Differential amplifier including dual magnetically coupled feedback loops |
| US12149216B2 (en) | 2021-02-09 | 2024-11-19 | QuantalRF AG | System and method for adjusting amplifier bias using envelope tracking |
| US12424976B2 (en) | 2021-02-09 | 2025-09-23 | QuantalRF AG | System and method for adjusting amplifier bias current based on input signal envelope tracking |
| US12355428B2 (en) | 2022-08-31 | 2025-07-08 | QuantaIRF AG | System and method for integrated filtering and amplification |
| US12519456B2 (en) | 2022-08-31 | 2026-01-06 | QuantalRF AG | Integrated coupled resonator filtering |
| US12567855B2 (en) | 2022-08-31 | 2026-03-03 | QuantalRF AG | System and method for coupled resonator filtering |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5814609A (en) | 1983-01-27 |
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