KR890007654Y1 - Resonance differential amplification circuit - Google Patents
Resonance differential amplification circuit Download PDFInfo
- Publication number
- KR890007654Y1 KR890007654Y1 KR2019860021881U KR860021881U KR890007654Y1 KR 890007654 Y1 KR890007654 Y1 KR 890007654Y1 KR 2019860021881 U KR2019860021881 U KR 2019860021881U KR 860021881 U KR860021881 U KR 860021881U KR 890007654 Y1 KR890007654 Y1 KR 890007654Y1
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- South Korea
- Prior art keywords
- circuit
- resonant
- transistor
- differential amplifier
- amplification circuit
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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/4508—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using bipolar transistors as the active amplifying circuit
- H03F3/45085—Long tailed pairs
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/45—Indexing scheme relating to differential amplifiers
- H03F2203/45501—Indexing scheme relating to differential amplifiers the CSC comprising a L-C parallel resonance circuit
Abstract
내용 없음.No content.
Description
제1도는 종래의 회로도.1 is a conventional circuit diagram.
제2도는 본 고안에 따른 회로도.2 is a circuit diagram according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1,2,7,8 : 입력단 3,4,9,10 : 출력단1,2,7,8: Input stage 3,4,9,10: Output stage
5 : 전류원 6 : 병렬 공진회로5: current source 6: parallel resonant circuit
Q1-Q4: 트랜지스터 R1-R7: 저항Q 1 -Q 4 : Transistor R 1 -R 7 : Resistance
C1,C2: 콘덴서 L1: 코일C 1 , C 2 : condenser L 1 : coil
I01,I02: 전류원I 01 , I 02 : Current source
본 고안은 차동증폭회로에 관한 것으로, 특히 차동 증폭회로가 공진 특성을 갖는 것에 적당하도록한 공진 차동 증폭회로에 관한 것이다. 종래의 차동 공진회로에 있어 공진 주파수 특성을 얻기 위해서는 공진 회로를 별도로 사용해야 하는 문제점이 있었다.The present invention relates to a differential amplifier circuit, and more particularly to a resonant differential amplifier circuit adapted to the differential amplifier circuit having a resonance characteristic. In the conventional differential resonant circuit, there is a problem in that a resonant circuit must be used separately to obtain resonant frequency characteristics.
따라서 본 고안은 상기한 문제점을 개선시킨 것으로, 차동 증폭회로에 RLC공진회로를 부가시켜서 공진 주파수 근처에서만 높은 출력 전압을 출력시키는 공진 차동 증폭기를 제공함에 목적이 있다.Accordingly, an object of the present invention is to provide a resonant differential amplifier which outputs a high output voltage only near the resonant frequency by adding an RLC resonant circuit to the differential amplifier circuit.
종래의 회로 구성을 제1도에 따라 설명하면 다음과 같다. 전원(Vcc)단은 저항(R1)(R2)을 각각 통해 트랜지스터(Q1)(Q2)의 콜렉터에 각각 연결하고, 트랜지스터(Q1)(Q2)의 각 베이스에는 입력단(1)(2)이 각각 연결되며, 트랜지스터(Q1)(Q2)의 에미터는 각각 저항(R3)(R4)을 통해 공접되어 전류원(5)을 통해서 접지접속된다.A conventional circuit configuration will be described with reference to FIG. 1 as follows. Power supply (Vcc) only the resistance (R 1) (R 2), respectively via the transistor (Q 1) respectively connected to the collector of the (Q 2), and the transistors the bases of the (Q 1) (Q 2), the input stage (1 (2) are respectively connected, and the emitters of transistors Q 1 and Q 2 are respectively coupled through resistors R 3 and R 4 and grounded through current source 5.
이와 같이 구성된 차동 증폭 회로의 동작을 제1도에 의거 간단하게 설명하면 다음과 같다.The operation of the differential amplifier circuit configured as described above will be briefly described with reference to FIG.
양입력단(1)(2)의 신호가 같은 상태로 트랜지스터(Q1)(Q2)의 베이스로 인가될때는 평형 상태가 되어 각 출력단(3)(4)으로는 o V의 전위가 출력되며, 양입력단(1)(2)의 신호가 차이가 있는 상태로 트랜지스터(Q1)(Q2)의 베이스로 인가될때는 이 신호의 차를 증폭하여 증폭한 전압을 출력단(3)(4)으로 출력시킨다.When the signals of both input terminals (1) and (2) are applied to the bases of the transistors Q 1 and Q 2 in the same state, they are in a balanced state, and the potential of o V is output to each of the output terminals 3 and 4. When the signals of both input terminals (1) and (2) are applied to the base of transistors (Q 1 ) and (Q 2 ) in a state where there is a difference, the amplified voltage is amplified by the difference between the signals of the output terminals (3) and (4). To print.
그런데 이와같이 동작하는 자동 증폭회로에 공진 주파수 특성을 얻기 위해서는 공진회로를 별도로 사용해여야 하는 문제점이 있었다.However, in order to obtain resonant frequency characteristics in the automatic amplifying circuit operating as described above, there is a problem in that a resonant circuit must be used separately.
따라서 상기한 문제점을 개선시킨 본 고안의 회로 구성을 제2도에 따라 설명하면 다음과 같다.Therefore, the circuit configuration of the present invention that improves the above problems will be described with reference to FIG.
전원(Vcc)단에 전류원(I1)을 연결하여 트랜지스터(Q4)의 콜렉터와 접지접속한 콘덴서(C2)를 각각 연결함과 동시에 저항(R5)과 코일(L1) 및 콘덴서(C1)로 구성된 병렬 공진회로(6)를 통해서 트랜지스터(Q3)의 콜렉터를 연결한다.Connect the current source (I 1 ) to the power supply (Vcc) terminal to connect the collector of transistor (Q 4 ) and the grounded capacitor (C 2 ), respectively, and at the same time, resistor (R 5 ), coil (L 1 ), and capacitor ( The collector of transistor Q 3 is connected via a parallel resonant circuit 6 composed of C 1 ).
이때 병렬 공진회로(6)내 저항(R5)의 양단에는 출력단(9)(10)을 연결한다.At this time, output terminals 9 and 10 are connected to both ends of the resistor R 5 in the parallel resonance circuit 6.
그리고 트랜지스터(Q3)(Q4)의 에미터는 각각 저항 (R6)(R7) 통해서 공접되어 접지 접속한 전류원(I2)에 연결되고, 상기 트랜지스터(Q3)(Q4)의 베이스에는 입력단(7)(8)을 각각 연결한다.The emitters of the transistors Q 3 and Q 4 are connected to a current source I 2 , which is grounded and connected to each other through a resistor R 6 and R 7 , respectively, and is a base of the transistor Q 3 and Q 4 . Input terminals 7 and 8 are connected respectively.
이와 같이 구성된 회로의 동작을 제2도에 의거 설명하면 다음과 같다. 입력 (7)(8)의 입력신호가 같을때 전류원(I1)의 전류는 트랜지스터(Q1)(Q2)를 각각 흐른다. 이때 트랜지스터(Q3)에 흐르는 전류는 모두 병렬 공진회로(6)의 코일(L1)을 통해 흐르므로 저항(R5)에는 전류가 흐르지 않아 출력단(9)(10)의 전압은 0이된다.The operation of the circuit configured as described above will be described with reference to FIG. When the input signals of the inputs 7 and 8 are the same, the current of the current source I 1 flows through the transistors Q 1 and Q 2 , respectively. At this time, since the current flowing through the transistor Q 3 all flows through the coil L 1 of the parallel resonant circuit 6, no current flows through the resistor R 5 , so that the voltage at the output terminals 9 and 10 becomes zero. .
여기서 병열 공진회로(6)의 공진주파수를 fo라고 할때 fo근처의 주파수르 가진 입력신호에 대해서는 병렬 공진회로(6)의 저항(R5)으로 전류가 흐르게되어 출력단(9)(10)으로는 전압이 출력되는 것이다.Here, when the resonant frequency of the parallel resonant circuit 6 is fo, a current flows through the resistance R 5 of the parallel resonant circuit 6 to the output terminals 9 and 10 with respect to an input signal having a frequency near fo. Is the voltage output.
즉 전류원(I1)중 일부 또는 전부가 공진주파수(fo)근처에서만 병렬 공진회로(6)의 저항(R5)으로 흐르게 되므로 그외에는 모두 코일(L1)을 통해 흐르기 때문에 저항(R5)의 양단에 거리는 출력전압은 결국 공진주파수(fo)근처에서만 높게 나타난다.That is, since some or all of the current source I 1 flows to the resistor R 5 of the parallel resonance circuit 6 only near the resonance frequency fo, all other flows through the coil L 1 , so the resistance R 5 The output voltage at both ends of the signal becomes high only near the resonant frequency (fo).
여기서 콘덴서(C2)는 바이패스용 콘덴서로서 트랜지스터(Q4)의 콜렉터 전압이 일정한 전압을 갖도록 고주파 성분을 통과시키는 역활을 한다.The capacitor C 2 is a bypass capacitor, and serves to pass high frequency components such that the collector voltage of the transistor Q 4 has a constant voltage.
상기한 바와 같이 본 고안은 차동 증폭 회로에 공진회로를 연결하여, 입력신호가 공진주파수 근처에 대해서만 증폭되는 것에 효과가 있다.As described above, the present invention is effective in connecting the resonant circuit to the differential amplifying circuit so that the input signal is amplified only near the resonant frequency.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019860021881U KR890007654Y1 (en) | 1986-12-30 | 1986-12-30 | Resonance differential amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019860021881U KR890007654Y1 (en) | 1986-12-30 | 1986-12-30 | Resonance differential amplification circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR880013862U KR880013862U (en) | 1988-08-30 |
| KR890007654Y1 true KR890007654Y1 (en) | 1989-10-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019860021881U KR890007654Y1 (en) | 1986-12-30 | 1986-12-30 | Resonance differential amplification circuit |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR890007654Y1 (en) |
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1986
- 1986-12-30 KR KR2019860021881U patent/KR890007654Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR880013862U (en) | 1988-08-30 |
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