JP4467463B2 - High frequency generator - Google Patents

High frequency generator Download PDF

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JP4467463B2
JP4467463B2 JP2005141101A JP2005141101A JP4467463B2 JP 4467463 B2 JP4467463 B2 JP 4467463B2 JP 2005141101 A JP2005141101 A JP 2005141101A JP 2005141101 A JP2005141101 A JP 2005141101A JP 4467463 B2 JP4467463 B2 JP 4467463B2
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local oscillator
power detection
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JP2006319739A (en
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慶久 宮本
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Shindengen Electric Manufacturing Co Ltd
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Description

本発明は、プラズマプロセス用に使用される高周波発生装置に関するものであって、この高周波発生装置における制御手段に関するものである。   The present invention relates to a high frequency generator used for a plasma process, and to a control means in the high frequency generator.

従来の高周波発生装置を図2に示す。この高周波発生装置は高周波発振源1と、この高周波発振源1の出力信号と高周波発生装置の出力からフィードバック制御された信号とを掛算する掛算器2と、この掛算器2より得られた信号を入力する高周波アンプ3と、この高周波アンプ3の電力を検出する高周波出力電力検出部4とを備えてある。   A conventional high frequency generator is shown in FIG. The high-frequency generator includes a high-frequency oscillation source 1, a multiplier 2 that multiplies an output signal of the high-frequency oscillation source 1 and a signal feedback-controlled from the output of the high-frequency generator, and a signal obtained from the multiplier 2. An input high-frequency amplifier 3 and a high-frequency output power detection unit 4 for detecting the power of the high-frequency amplifier 3 are provided.

この従来例は、第二の高周波発振源13と第二の高周波アンプ14とを備えたローカル発振器12を備えてある。高周波出力電力検出部4から得られた高周波出力電力検出信号とローカル発振器12より発振されたローカル発振信号とを掛算器5で掛算し、これをローパスフィルタ6で差分のみ取り出し、検波器7で検波して、誤差増幅器8で基準電圧9と比較して高周波アンプ3の入力にフィードバック制御することにより、差周波数成分を得ることができる。これにより、高周波出力を安定化させていた。なお、この方式をヘテロダイン方式と呼んでいる(例えば、非特許文献1参照)。
「アマチュア無線ハンドブック」JARL 昭和56年11月1日発行 p.202−204
This conventional example includes a local oscillator 12 including a second high-frequency oscillation source 13 and a second high-frequency amplifier 14. The high frequency output power detection signal obtained from the high frequency output power detection unit 4 and the local oscillation signal oscillated from the local oscillator 12 are multiplied by the multiplier 5, and only the difference is extracted by the low-pass filter 6 and detected by the detector 7. Then, the difference frequency component can be obtained by feedback control of the error amplifier 8 to the input of the high-frequency amplifier 3 in comparison with the reference voltage 9. Thereby, the high frequency output was stabilized. This method is called a heterodyne method (see, for example, Non-Patent Document 1).
"Amateur Radio Handbook" JARL issued on November 1, 1981 p. 202-204

しかし、ローカル発振器12の出力は第二の高周波アンプ14の温度安定度や検波器7に供給される電源電圧変動の影響を受け、不安定なレベルとなるおそれがある。また、ローカル発振器12の出力レベルが変化して、その変化量がそのまま検出信号の変化となって現れる。ローカル発振器12の出力が不安定になると掛算後の信号も不安定となり、その結果、高周波出力も不安定なものになる。   However, the output of the local oscillator 12 may be unstable due to the temperature stability of the second high-frequency amplifier 14 and the fluctuation of the power supply voltage supplied to the detector 7. Further, the output level of the local oscillator 12 changes, and the change amount appears as the change of the detection signal as it is. When the output of the local oscillator 12 becomes unstable, the signal after multiplication becomes unstable, and as a result, the high-frequency output becomes unstable.

本発明は、上記問題に鑑みてなされたものであり、高周波出力を安定化させる高周波発生装置を提供する。   This invention is made | formed in view of the said problem, and provides the high frequency generator which stabilizes a high frequency output.

上記課題を解決するために、本発明に係る高周波発生装置は、高周波発振源と、この高周波発振源の出力信号に基づく高周波出力電力を検出する高周波出力電力検出部とを備え、さらに、前記高周波発振源とは別である第二の高周波発振源を有し、この第二の高周波発振源から発する高周波を増幅してローカル発振信号を出力するローカル発振器を備えてあり、前記高周波出力電力検出部から得られた高周波出力電力検出信号と、前記ローカル発振器より発振されたローカル発振信号とを掛算し、この掛算信号を平滑して前記高周波発振源と前記高周波出力電力検出部との間に設けた高周波アンプの入力にフィードバック制御をかけるフィードバック制御回路を備えた高周波発生装置であって、前記ローカル発振器は、前記第二の高周波発振源と、この第二の高周波発振源の出力信号に基づく高周波出力電力を検出する第二の高周波出力電力検出部とを備えてあることを特徴とする。 In order to solve the above-described problems, a high-frequency generator according to the present invention includes a high-frequency oscillation source and a high-frequency output power detection unit that detects high-frequency output power based on an output signal of the high-frequency oscillation source, and further A high- frequency output power detector that has a second high-frequency oscillation source that is separate from the oscillation source, a local oscillator that amplifies a high-frequency wave emitted from the second high-frequency oscillation source and outputs a local oscillation signal; The high frequency output power detection signal obtained from the signal is multiplied by the local oscillation signal oscillated from the local oscillator, and the multiplication signal is smoothed and provided between the high frequency oscillation source and the high frequency output power detection unit. a high-frequency generator having a feedback control circuit for applying a feedback control to the input of the RF amplifier, the local oscillator, the second high-frequency oscillator When, characterized in that are provided with a second high-frequency output power detector for detecting an RF output power based on the output signal of the second high-frequency oscillation source.

前記ローカル発振器は、前記第二の高周波発振源の出力信号とこのローカル発振器の出力からフィードバック制御された信号とを掛算する掛算器を備えてあることを特徴とする。
また、前記ローカル発振器は、前記掛算器より得られた信号を入力し、前記第二の高周波出力電力検出部に電力信号を出力する高周波アンプを備えてあることを特徴とする。
The local oscillator includes a multiplier that multiplies an output signal of the second high-frequency oscillation source and a signal feedback-controlled from the output of the local oscillator.
The local oscillator includes a high-frequency amplifier that inputs a signal obtained from the multiplier and outputs a power signal to the second high-frequency output power detection unit.

前記ローカル発振器は、前記第二の高周波出力電力検出部から得られた第二の高周波出力電力検出信号を検波する検波器と、この検波器により出力される信号と基準電圧信号とを比較誤差増幅する誤差増幅器とを備え、この誤差増幅信号を前記掛算器に出力するようにしてあることを特徴とする。 The local oscillator detects a second high-frequency output power detection signal obtained from the second high-frequency output power detection unit, compares the signal output from the detector with a reference voltage signal, and amplifies the error. And an error amplifier for outputting the error amplified signal to the multiplier .

本発明によれば、ローカル発振器にフィードバック制御回路を設けたことにより、ローカル発振器からの出力の変動が少なくなった分、ローカル発振器の出力が安定化し、その結果高周波出力が安定化する効果がある。   According to the present invention, since the feedback control circuit is provided in the local oscillator, the output of the local oscillator is stabilized by the amount of fluctuation in the output from the local oscillator, and as a result, the high-frequency output is stabilized. .

発明を実施するための最良の形態の回路図を図1に示す。図1図示の高周波発生装置は、この高周波発生装置は高周波発振源1と、この高周波発振源1の出力信号と高周波発生装置の出力からフィードバック制御された信号とを掛算する掛算器2と、この掛算器2より得られた信号を入力する高周波アンプ3と、この高周波アンプ3の電力を検出する高周波出力電力検出部4とを備えてある。   A circuit diagram of the best mode for carrying out the invention is shown in FIG. The high frequency generator shown in FIG. 1 includes a high frequency oscillation source 1, a multiplier 2 that multiplies an output signal of the high frequency oscillation source 1 and a signal feedback-controlled from the output of the high frequency generation device, A high-frequency amplifier 3 that inputs a signal obtained from the multiplier 2 and a high-frequency output power detector 4 that detects the power of the high-frequency amplifier 3 are provided.

本実施例の高周波発生装置は、高周波出力電力検出部4から得られた高周波出力電力検出信号とローカル発振器22より発振されたローカル発振信号に基づいて掛算器2にフィードバック制御をかけるフィードバック制御回路を備えてある。   The high frequency generator of the present embodiment includes a feedback control circuit that performs feedback control on the multiplier 2 based on the high frequency output power detection signal obtained from the high frequency output power detection unit 4 and the local oscillation signal oscillated from the local oscillator 22. I have it.

この実施例は、高周波出力電力検出部4から得られた高周波出力電力検出信号と前記ローカル発振器22より発振されたローカル発振信号とを掛算器5で掛算し、これをローパスフィルタ6で差分のみ取り出し、検波器7で検波して、誤差増幅器8で基準電圧9と比較して高周波アンプ3の入力にフィードバック制御するように構成してある。   In this embodiment, the high frequency output power detection signal obtained from the high frequency output power detection unit 4 and the local oscillation signal oscillated from the local oscillator 22 are multiplied by the multiplier 5, and only the difference is extracted by the low-pass filter 6. The detection is performed by the detector 7 and the error amplifier 8 is compared with the reference voltage 9 to perform feedback control to the input of the high-frequency amplifier 3.

本発明はローカル発振器22に特徴を有し、本実施例に係るローカル発振器22は、第二の高周波発振源13と、この高周波発振源13の出力信号とこのローカル発振器22の出力からフィードバック制御された信号とを掛算する掛算器21と、この掛算器21より得られた信号を入力する高周波アンプ14と、この高周波アンプ14の電力を検出する高周波出力電力検出部15とを備えてある。   The present invention is characterized by a local oscillator 22. The local oscillator 22 according to the present embodiment is feedback-controlled from the second high-frequency oscillation source 13, the output signal of the high-frequency oscillation source 13 and the output of the local oscillator 22. A multiplier 21 that multiplies the received signal, a high-frequency amplifier 14 that receives the signal obtained from the multiplier 21, and a high-frequency output power detector 15 that detects the power of the high-frequency amplifier 14.

また、ローカル発振器22は、高周波出力電力検出部15から得られた第二の高周波出力電力検出信号を検波器16で検波し、誤差増幅器17で基準電圧18と比較し、このフィードバック制御信号と第二の高周波発振源13から発する高周波とを掛算器21で掛算して、高周波アンプ14の入力にフィードバック制御するように構成してある。   The local oscillator 22 detects the second high-frequency output power detection signal obtained from the high-frequency output power detection unit 15 with the detector 16 and compares it with the reference voltage 18 with the error amplifier 17. The high frequency generated from the second high frequency oscillation source 13 is multiplied by a multiplier 21 and is feedback-controlled to the input of the high frequency amplifier 14.

以上のように構成してある高周波発生装置についての作用を以下で具体的に説明する。この高周波発生装置は、通常、高周波出力電力検出部4から得られた高周波出力電力検出信号v1とローカル発振器22より発振されたローカル発振信号v2とを掛算器5で掛算する。なお、高周波出力電力検出信号v1及びローカル発振信号v2は以下のような式で表現できる(式内のA,Bは振幅、ωは角速度、tは時間である。)。
v1=Asin(ω1t) …(1)
v2=Bsin(ω2t) …(2)
The operation of the high frequency generator configured as described above will be specifically described below. This high frequency generator normally multiplies the high frequency output power detection signal v 1 obtained from the high frequency output power detection unit 4 and the local oscillation signal v 2 oscillated from the local oscillator 22 by the multiplier 5. The high-frequency output power detection signal v1 and the local oscillation signal v2 can be expressed by the following equations (A and B in the equation are amplitudes, ω is angular velocity, and t is time).
v1 = Asin (ω1t) (1)
v2 = Bsin (ω2t) (2)

掛算器5で前記(1)式と(2)式で乗算することにより、以下のような出力信号v0を得る。
v0=Asin(ω1t)×Bsin(ω2t)
=(1/2)ABcos(ω1−ω2)t−(1/2)ABcos(ω1+ω2)t …(3)
以上より、掛算器5で乗算して得られた出力信号v0は、高周波発振源1の周波数とローカル発振器22内の第二の高周波発振源13の周波数f1(=ω1/2π),f2(=ω2/2π)の和と差が混合した信号になる。
The multiplier 5 multiplies the above equations (1) and (2) to obtain the following output signal v0.
v0 = Asin (ω1t) × Bsin (ω2t)
= (1/2) ABcos (ω1-ω2) t- (1/2) ABcos (ω1 + ω2) t (3)
From the above, the output signal v0 obtained by multiplication by the multiplier 5 is equal to the frequency of the high-frequency oscillation source 1 and the frequencies f1 (= ω1 / 2π) and f2 (= The signal is a mixture of the sum and difference of (ω2 / 2π).

ローカル発振器22では、高周波出力電力検出部15から得られた第二の高周波出力を掛算器5に出力するとともに、高周波出力電力検出部15から得られた第二の高周波出力電力検出信号を検波器16に出力する。高周波出力電力検出信号をこの検波器16で検波し、誤差増幅器17で基準電圧18と比較する。このフィードバック制御信号と第二の高周波発振源13から発する高周波とを掛算器21で掛算して、高周波アンプ14の入力にフィードバック制御する。フィードバック制御された第二の高周波出力電力検出信号は高周波出力電力検出部15から掛算器5へ出力される。   The local oscillator 22 outputs the second high-frequency output obtained from the high-frequency output power detection unit 15 to the multiplier 5 and also detects the second high-frequency output power detection signal obtained from the high-frequency output power detection unit 15. 16 is output. The high frequency output power detection signal is detected by the detector 16 and compared with the reference voltage 18 by the error amplifier 17. The feedback control signal and the high frequency generated from the second high frequency oscillation source 13 are multiplied by a multiplier 21 to perform feedback control to the input of the high frequency amplifier 14. The feedback-controlled second high frequency output power detection signal is output from the high frequency output power detection unit 15 to the multiplier 5.

以上のようにローカル発振器22から出力される第二の高周波出力電力検出信号と、高周波出力電力検出部4から出力される高周波出力電力検出信号とを掛算器5で掛算し、これをローパスフィルタ6で差分のみ取り出す。このローパスフィルタ6により、高周波出力電力検出信号に発振器1の周波数の高調波が含まれていたとしても、ローパスフィルタ6の出力にはその高調波に影響されない検出信号が現れる。検波器7で検波して、誤差増幅器8で基準電圧9と比較して高周波アンプ3の入力にフィードバック制御する。   As described above, the second high-frequency output power detection signal output from the local oscillator 22 and the high-frequency output power detection signal output from the high-frequency output power detection unit 4 are multiplied by the multiplier 5, and this is multiplied by the low-pass filter 6. To extract only the difference. Even if the high-frequency output power detection signal includes harmonics of the frequency of the oscillator 1, a detection signal that is not affected by the harmonics appears in the output of the low-pass filter 6. The signal is detected by the detector 7 and compared with the reference voltage 9 by the error amplifier 8 to be feedback-controlled to the input of the high-frequency amplifier 3.

以上の作用により、ローカル発振器22から出力される第二の高周波出力電力検出信号と、高周波出力電力検出部4から出力される高周波出力電力検出信号とを掛算器5で掛算して得た信号は、ローカル発振器22の出力変動が従来のローカル発振器12より減少したことにより、安定化される。その結果、高周波出力電力検出部4から出力される高周波出力も安定化される。   With the above operation, the signal obtained by multiplying the second high frequency output power detection signal output from the local oscillator 22 and the high frequency output power detection signal output from the high frequency output power detection unit 4 by the multiplier 5 is The output fluctuation of the local oscillator 22 is reduced as compared with the conventional local oscillator 12, so that the output is stabilized. As a result, the high frequency output output from the high frequency output power detection unit 4 is also stabilized.

なお、本発明は前記実施例に限定されるものではなく、特許請求の範囲に記載されている内容が本発明の技術的範囲に属する。   In addition, this invention is not limited to the said Example, The content as described in the claim belongs to the technical scope of this invention.

本発明によれば、ローカル発振器にフィードバック制御回路を設けたことにより、ローカル発振器からの出力の変動が少なくなった分、ローカル発振器の出力が安定化し、その結果高周波出力が安定化し、産業上利用性を有する。   According to the present invention, by providing the feedback control circuit in the local oscillator, the output of the local oscillator is stabilized by the amount of fluctuation of the output from the local oscillator, and as a result, the high-frequency output is stabilized and is industrially used. Have sex.

本発明に係る高周波発生装置における発明を実施するための最良の形態の回路図である。1 is a circuit diagram of the best mode for carrying out the invention in a high-frequency generator according to the present invention. 従来の高周波発生装置の回路図である。It is a circuit diagram of the conventional high frequency generator.

符号の説明Explanation of symbols

1,13 高周波発振器
2,5,21 掛算器
3,14 高周波アンプ
4,15 高周波出力電力検出部
6 ローパスフィルタ
7,16 検波器
8,17 誤差増幅器
9,18 基準電圧
12,22 ローカル発振器
DESCRIPTION OF SYMBOLS 1,13 High frequency oscillator 2,5,21 Multiplier 3,14 High frequency amplifier 4,15 High frequency output power detection part 6 Low pass filter 7,16 Detector 8,17 Error amplifier 9,18 Reference voltage 12,22 Local oscillator

Claims (4)

高周波発振源と、この高周波発振源の出力信号に基づく高周波出力電力を検出する高周波出力電力検出部とを備え、さらに、前記高周波発振源とは別である第二の高周波発振源を有し、この第二の高周波発振源から発する高周波を増幅してローカル発振信号を出力するローカル発振器を備えてあり、前記高周波出力電力検出部から得られた高周波出力電力検出信号と、前記ローカル発振器より発振されたローカル発振信号とを掛算し、この掛算信号を平滑して前記高周波発振源と前記高周波出力電力検出部との間に設けた高周波アンプの入力にフィードバック制御をかけるフィードバック制御回路を備えた高周波発生装置であって、前記ローカル発振器は、前記第二の高周波発振源と、この第二の高周波発振源の出力信号に基づく高周波出力電力を検出する第二の高周波出力電力検出部とを備えてあることを特徴とする高周波発生装置。 A high-frequency oscillation source, and a high-frequency output power detection unit that detects a high-frequency output power based on an output signal of the high-frequency oscillation source, and further includes a second high- frequency oscillation source that is different from the high-frequency oscillation source , A local oscillator that amplifies the high frequency emitted from the second high frequency oscillation source and outputs a local oscillation signal is provided, and is oscillated from the high frequency output power detection signal obtained from the high frequency output power detection unit and the local oscillator. High-frequency generation provided with a feedback control circuit that multiplies the local oscillation signal and smoothes the multiplication signal and applies feedback control to the input of a high-frequency amplifier provided between the high-frequency oscillation source and the high-frequency output power detection unit an apparatus, said local oscillator, said a second high-frequency oscillation source, high-frequency output based on the output signal of the second high-frequency oscillation source Microwave generator, characterized in that are provided with a second high-frequency output power detector for detecting a force. 前記ローカル発振器は、前記第二の高周波発振源の出力信号とこのローカル発振器の出力からフィードバック制御された信号とを掛算する掛算器を備えてあることを特徴とする請求項1記載の高周波発生装置。 2. The high frequency generator according to claim 1, wherein the local oscillator includes a multiplier that multiplies an output signal of the second high frequency oscillation source and a signal feedback-controlled from the output of the local oscillator. . 前記ローカル発振器は、前記掛算器より得られた信号を入力し、前記第二の高周波出力電力検出部に電力信号を出力する高周波アンプを備えてあることを特徴とする請求項2記載の高周波発生装置。 3. The high-frequency generation according to claim 2, wherein the local oscillator includes a high-frequency amplifier that inputs a signal obtained from the multiplier and outputs a power signal to the second high-frequency output power detection unit. apparatus. 前記ローカル発振器は、前記第二の高周波出力電力検出部から得られた第二の高周波出力電力検出信号を検波する検波器と、この検波器により出力される信号と基準電圧信号とを比較誤差増幅する誤差増幅器とを備え、この誤差増幅信号を前記掛算器に出力するようにしてあることを特徴とする請求項2又は3記載の高周波発生装置。 The local oscillator detects a second high-frequency output power detection signal obtained from the second high-frequency output power detection unit, compares the signal output from the detector with a reference voltage signal, and amplifies the error. 4. The high frequency generator according to claim 2 , further comprising: an error amplifier configured to output the error amplified signal to the multiplier .
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