KR960008158Y1 - Circuit for preventing change of frequency - Google Patents
Circuit for preventing change of frequency Download PDFInfo
- Publication number
- KR960008158Y1 KR960008158Y1 KR2019910020790U KR910020790U KR960008158Y1 KR 960008158 Y1 KR960008158 Y1 KR 960008158Y1 KR 2019910020790 U KR2019910020790 U KR 2019910020790U KR 910020790 U KR910020790 U KR 910020790U KR 960008158 Y1 KR960008158 Y1 KR 960008158Y1
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- South Korea
- Prior art keywords
- oscillator
- buffer amplifier
- transistor
- output
- voltage variable
- Prior art date
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1237—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator
- H03B5/124—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance
- H03B5/1243—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance the means comprising voltage variable capacitance diodes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1231—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier comprising one or more bipolar transistors
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- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
요약없음No summary
Description
제1도는 종래의 전압가변발진기의 회로도.1 is a circuit diagram of a conventional voltage variable oscillator.
제2도는 본 고안 전압가변발진기의 일실시예도.Figure 2 is an embodiment of the present invention voltage variable oscillator.
제3도는 본 고안 전압가변발진기의 타실시예도.3 is another embodiment of the present invention a voltage variable oscillator.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
A : 버퍼증폭부B : 발진부A: buffer amplifier B: oscillator
Q1, Q2: 트랜지스터RFC1: RF초크코일Q 1 , Q 2 : Transistor RFC 1 : RF Choke Coil
R1-R5: 저항L1: 초크코일R 1 -R 5 : Resistance L 1 : Choke Coil
C1-C8: 콘덴서VD1: 바랙터다이오드C 1 -C 8 : Condenser VD 1 : Varactor diode
본 고안은 전압가변발진기의 출력주파수변동방지회로에 관한 것으로, 특히 전압을 제어하여 발진신호를 출력시키는 전압가변발진기의 버퍼증폭부와 발진부사이에 RF초크코일을 접속시켜 버퍼증폭부의 출력단 부하임피던스 변동시에도 출력주파수의 변동이 되지않도록한 전압가변발진기의 출력주파수변동방지회로에 관한 것이다.The present invention relates to an output frequency fluctuation prevention circuit of a voltage variable oscillator. Particularly, an output impedance load variation of a buffer amplifier part is connected by connecting an RF choke coil between a buffer amplifier and an oscillator of a voltage variable oscillator that outputs an oscillation signal by controlling voltage. The present invention relates to an output frequency fluctuation prevention circuit of a voltage variable oscillator which does not cause an output frequency fluctuation even when
종래의 전압가변발진기의 제1도에 도시한 바와같이, 트랜지스터(Q1)를 에미터접지형으로 구성한 버퍼증폭부(A)와, 트랜지스터(Q2)를 콜렉터접지형으로 구성한 발진부(B)를 직렬접속시켜, 상기 발진부(B)의 트랜지스터(Q2)의 에미터단자로부터 출력되는 발진신호를 상기 버퍼증폭부(A)의 트랜지스터(Q1)의 베이스단자에 입력시켜 트랜지스터(Q1)로 증폭한 후 그의 콜렉터로 증폭된 발진신호를 출력하도록 되어 있는 바, 상기와같은 전압가변발진기는 버퍼증폭부의 트랜지스터(Q1)이 에미터접지이므로 출력측 부하임피던스가 변화하면 밀러효과에 의하여 출력주파수가 변하게되는 문제점을 가지게 되었다.An oscillation unit (B), configuring a transistor buffer amplifier section (A), a transistor (Q 2) is configured to (Q1) with emitter ground type in the collector ground type as shown in the first diagram of a conventional voltage-dependent oscillator It was connected in series to the transistor (Q 1) as input to the base terminal of the transistor (Q 1) of the oscillation (B) transistor and the buffer, an oscillating signal outputted from the emitter terminal of the (Q 2) amplifying part (a) of After the amplification, the amplified oscillation signal is outputted to the collector thereof. As the voltage variable oscillator described above, the transistor Q 1 of the buffer amplification part is emitter grounded. I had a problem that changed.
본 고안의 목적은 전압가변발진기의 버퍼증폭부와 발진부간에 교류적으로 격리시켜 버퍼증폭부의 출력측 부하임피던스 변동시에도 출력주파수의 변동을 방지 할수 있는 출력주파수변동방지회로를 제공하고자 하는데 있으며, 상기의 목적을 실현하기위하여 본 고안은 버퍼증폭부와 발진부로 구성된 전압가변발진기에 있어서, 상기 버퍼증폭부의 트랜지스터를 베이스접지로 구성시키고 상기 버퍼증폭부와 발진부를 교류적으로 격리시켜 부하임피던스변동에도 출력주파수 변동을 방지할수 있도록 RF초크코일로 접속하고 상기 발진부의 출력신호는 상기 버퍼증폭부의 에미터단자로 입력되게 접속한 것을 특징으로 한다.An object of the present invention is to provide an output frequency fluctuation prevention circuit that can prevent the fluctuation of the output frequency even when the load impedance of the output side of the buffer amplifier is changed by isolation between the buffer amplifier and the oscillator of the voltage variable oscillator. In order to realize the object, the present invention is a voltage variable oscillator composed of a buffer amplifier and an oscillator, wherein the transistor of the buffer amplifier is configured as a base ground and the buffer amplifier and the oscillator are isolated from each other by alternating the output frequency even under load impedance fluctuations. The RF choke coil is connected to prevent variations, and the output signal of the oscillator is connected to be input to the emitter terminal of the buffer amplifier.
이하 첨부된 도면에 의거 본 고안을 상세 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
제2도는 본 고안 전압가변발진기의 일실시예도로서 버퍼증폭부(A)와 발진부(B)를 구비하여서된 전압가변발진기에 있어서, 상기 버퍼증폭부(A)의 트랜지스터(Q1)를 부하임피던스변동영향을 줄이기위하여 베이스접지버퍼증폭부로 구성하고 상기 발진부(B)와 교류적으로 격리시키기위하여 RF초크코일(RFC1), 저항(R5)를 통해서 접속하며, 상기 발진부(B)의 트랜지스터(Q2)의 에미터단자로부터의 출력발진신호는 상기 버퍼증폭부(A)의 트랜지스터(Q1)의 에미터단자로 입력되게 구성하여서 된 것이다.2 is a diagram illustrating an embodiment of a voltage variable oscillator of the present invention, in which a voltage variable oscillator including a buffer amplifier A and an oscillator B is used, and the transistor Q 1 of the buffer amplifier A is loaded with impedance. It consists of a base ground buffer amplifier to reduce the fluctuation effect, and is connected through the RF choke coil (RFC 1 ), a resistor (R 5 ) in order to isolate the oscillation from the oscillator (B), the transistor of the oscillator (B) ( The output oscillation signal from the emitter terminal of Q 2 ) is configured to be input to the emitter terminal of the transistor Q 1 of the buffer amplifier A.
제3도는 본 고안 전압가변발진기의 타실시예도로서, 버퍼증폭부(A)의 트랜지스터(Q1)와 발진부(B)의 트랜지스터(Q2)를 부하의 임피던스변동영향을 줄이기 위하여 베이스접지로 각각 구성하되, 상기 버퍼증폭부(A)와 발진부(B)를 교류적으로 격리시키기 위하여 RF초크코일(RFC1)저항(R5)로 접속하고, 상기 발진부(B)의 에미터단자 출력발진신호는 상기 버퍼증폭부(A)의 트랜지스터(Q1)의 에미터단자로 입력되게 구성하여서 된 것이다.3 is another embodiment of the voltage variable oscillator of the present invention, in which the transistor Q 1 of the buffer amplifier A and the transistor Q 2 of the oscillator B are respectively connected to the base ground to reduce the influence of impedance variation of the load. It is configured, but is connected to the RF choke coil (RFC 1 ) resistor (R 5 ) in order to isolate the buffer amplifier (A) and the oscillator (B) in alternating current, the emitter terminal output oscillation signal of the oscillator (B) Is configured to be input to the emitter terminal of the transistor Q 1 of the buffer amplifier A.
상기와 같이 구성하여서 된 본 고안의 작용효과를 설명하면 다음과같다.Referring to the operation and effect of the subject innovation made up as described above is as follows.
제2도및 제3도에 도시한 바와같이, 회로에 전원이 인가되고, 버퍼증폭부(A)에서 전압제어가 이루어지면, 발진부(B)에서는 발진을 하여 트랜지스터(Q2)의 에미터단자로 부터 발진신호를 출력하여 상기 버퍼증폭부(A)로 입력시키고, 상기 버퍼증폭부(A)에서 출력단으로 발진신호를 출력시키게되는데, 이때, 상기 버퍼증폭부(A)는 출력단의 부하 변동에 부하영향을 줄이기위하여 상기 버퍼증폭부(A)의 트랜지스터(Q1)를 베이스접지시키고, 상기 버퍼증폭부(A)와 발진부(B)사이에는 RF초크코일(RFC1)로 접속하여 상기 버퍼증폭부(A)와 발진부(B)를 교류적으로 격리시키고, 상기 발진부(B)의 트랜지스터(Q2)의 에미터단자로부터 발진신호는 버퍼증폭부(A)의 트랜지스터(Q1)의 에미터단자에 입력시키므로 상기 트랜지스터(Q1)의 출력단의 부하변동에 대하여 부하변동에 대한 영향을 받지않아 상기 부하변동에 의한 출력주파수변동을 막을수 있게되는 것이다.2 and 3, when power is applied to the circuit and voltage control is performed in the buffer amplifier unit A, the oscillator unit B oscillates to emit the emitter terminal of the transistor Q 2 . The oscillation signal is outputted from the input to the buffer amplifier (A), and the oscillation signal is output from the buffer amplifier (A) to the output stage, wherein the buffer amplifier (A) is in response to the load variation of the output stage. In order to reduce the load effect, the transistor Q 1 of the buffer amplifier A is grounded, and the buffer amplifier A is connected to the oscillator B with an RF choke coil RFC 1 to connect the buffer amplifier. The part A and the oscillation part B are isolated from each other in an alternating manner, and the oscillation signal from the emitter terminal of the transistor Q 2 of the oscillation part B is transmitted to the emitter of the transistor Q 1 of the buffer amplifier A. Since the input to the terminal, the load change with respect to the load change of the output terminal of the transistor Q 1 Without being influenced by the dynamics, the output frequency variation due to the load variation can be prevented.
이상에서 설명한 바와같이 본 고안은 버퍼증폭부와 발진부로 구성된 전압가변발진기에 있어서, 상기 버퍼증폭기의 트랜지스터를 베이스접지로 구성시키고, 상기 버퍼증폭부와 발진부사이에는 교류적으로 격리시키기위해 RF초크코일을 접속시키며, 상기 발진부의 출력은 상기 버퍼증폭부의 트랜지스터 에미터단자에 입력되게 접속시킴으로써, 상기 버퍼증폭부의 출력단 부하임피던스변동에 대하여 출력주파수변동을 방지할수 있는 이점을 제공하게 되는 것이다.As described above, the present invention is a voltage variable oscillator including a buffer amplifier and an oscillator, wherein the transistor of the buffer amplifier is configured as a base ground, and the RF choke coil is isolated in an alternating current between the buffer amplifier and the oscillator. By connecting the output of the oscillator to the transistor emitter terminal of the buffer amplifier, the output frequency variation can be prevented against the load impedance variation of the output stage of the buffer amplifier.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019910020790U KR960008158Y1 (en) | 1991-11-29 | 1991-11-29 | Circuit for preventing change of frequency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019910020790U KR960008158Y1 (en) | 1991-11-29 | 1991-11-29 | Circuit for preventing change of frequency |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR930012273U KR930012273U (en) | 1993-06-25 |
| KR960008158Y1 true KR960008158Y1 (en) | 1996-09-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019910020790U KR960008158Y1 (en) | 1991-11-29 | 1991-11-29 | Circuit for preventing change of frequency |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR960008158Y1 (en) |
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1991
- 1991-11-29 KR KR2019910020790U patent/KR960008158Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR930012273U (en) | 1993-06-25 |
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