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Transistor Basic Amplification circuit The judgment of "C" is a basic and important skill in the design and analysis of electronic circuits. As a three terminal device, BCM4306KFB transistor mainly includes collector, base and emitter. According to which of the three ports is connected as the common terminal (ground), the basic Amplification circuit There are three types: common emitter Amplification circuit Co collector Amplification circuit (also called emitter follower) and common base Amplification circuit 。 Common emitter Amplification circuit Common emitter Amplification circuit Is the most common one Amplification circuit The input signal is added between the base and emitter, and the output signal is taken from the collector and emitter
Date: April 28, 2024 Reading: 729
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When the ultrasonic wave enters the object, the acoustic wave frequency will have reflective surface, mapping, transmission, and the signal receiver can accept the radar echo. Analyzing the radar echo can accurately detect the defect position, appearance, and size. ATA-4315 is an ideal unidirectional ultrasonic power for variable switching and DC data signals Amplification circuit 。 With the increasing attention to the structural safety factor of equipment, nondestructive testing technology has become one of the indispensable monitoring methods in the manufacturing and application of contemporary structural equipment Amplification circuit It is indispensable in nondestructive testing technology. Applied in aerospace, power engineering manufacturing, petrochemical equipment transportation, production and processing and other industries, mechanical equipment structure is usually in the extreme
Date: 2022-2-18 Reading: 969
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Low cost, high power consumption, output power detection element (MAX4002) and 4-band GSM/GPRS power Amplification circuit (PA) (XIN9133). There is a high-speed control loop inside the XIN9133, which is used to adjust the collector working voltage of the amplifier and maintain a fixed reference point at each level. Low cost, high power consumption, output power detection element (MAX4002) and 4-band GSM/GPRS power Amplification circuit (PA) (XIN9133). This control system constantly adjusts the power supply voltage to keep it at the allowable minimum value
Date: 2021-4-2 Reading: 1024
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Photocouplers are used in vicious electronic products, so what is a photoelectric coupler? Optocoupler is a kind of electrical optical electrical converter that transmits electrical signals through optical media. It consists of a light source and a light receiver. The light source and the light receiver are assembled in the same closed shell, and are separated from each other by transparent insulators. The pin of the light source is the input end, and the pin of the light receiver is the output end. The common light source of BSO200N03 is the light-emitting diode, and the light receiver is the light-sensitive diode, light-sensitive triode, etc. What is a coupled circuit? In order to realize the transmission of energy and signal, the method of connecting each functional circuit is called coupling circuit. In general, coupled circuits usually have filtering
Date: March 27, 2020 Reading: 1529
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The latest high-performance operational amplifier PA75 launched by Apex Microtechnology in the United States is a monolithic dual operational amplifier. One of the operational amplifiers is internally configured as a follower with one gain to increase the current of the other amplifier. The circuit structure is particularly suitable for realizing economical bridge motor drive circuit by using multiple amplifiers. The operating voltage range of PA75 is 5V~40V, the total current can reach 2.5A, the gain bandwidth product is 1.4MHZ, and the harmonic distortion is 0.02%, so it is also very suitable for high-power audio Amplification circuit 。 PA75 provides three standard packages, surface mount package PA75C
Date: August 9, 2007 Reading: 868
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The latest high-performance operational amplifier PA75 launched by Apex Microtechnology in the United States is a monolithic dual operational amplifier. One of the operational amplifiers is internally configured as a follower with one gain to increase the current of the other amplifier. The circuit structure is particularly suitable for realizing economical bridge motor drive circuit by using multiple amplifiers. The operating voltage range of PA75 is 5V~40V, the total current can reach 2.5A, the gain bandwidth product is 1.4MHZ, and the harmonic distortion is 0.02%, so it is also very suitable for high-power audio Amplification circuit 。 PA75 provides three kinds of standard packaging, surface mount packaging PA75CC can effectively save the body
Date: January 25th, 2008 Reading: 1321
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Class D audio amplifier has been widely used in circuits. Its principle is very different from that of Class AB amplifier familiar to people in the past. Designers must understand the difference in order to better apply it in actual design. This paper will compare Class AB amplifier with Class D amplifier, discuss the principle of Class D amplifier to achieve high efficiency, and explain why normal sound can be heard through speakers when the output waveform is pulse width modulation (PWM). At present, in consumer electronic products such as mobile phones, flat screen televisions, LCD displays, and portable game devices, more and more high-efficiency Class D amplifiers have been used, but in many cases, designers do not understand consumer electronic products
Date: January 25th, 2008 Reading: 1301
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In order to realize single power supply without transformer and large capacitance, bridge push-pull power can be used Amplification circuit , referred to as BTL circuit, as shown in the figure. The four tubes in the figure have symmetrical characteristics, are in the cut-off state in static state, and the voltage on the load is zero. Let the switching on voltage between transistors b-e be negligible. Operating principle: input voltage is sine wave ◆ When ui>0, T1 and T4 tubes are on, T2 and T3 tubes are off, the current is as shown in the figure, and a positive half cycle voltage is obtained on the load; ◆ When ui
Date: January 25th, 2008 Reading: 1732
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Power without output capacitance Amplification circuit , referred to as OCL circuit. As shown in the figure. In the OCL circuit, T1 and T2 have symmetrical characteristics and are powered by dual power supplies. In static state, T1 and T2 are cut off, and the output voltage is zero. Let the switching on voltage between transistors b-e be negligible. Operating principle: when the input voltage is a sine wave ◆ When ui>0, T1 tube is on, T2 tube is off, positive power supply is available, current is as shown in the figure, and the circuit is emitter output, uo ≈ ui; ◆ When ui
Date: January 25th, 2008 Reading: 1234
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Transformer coupling power Amplification circuit Advantages: impedance transformation can be realized. Disadvantages: large volume, bulky, low efficiency, poor high-frequency and low-frequency characteristics. Power without output transformer Amplification circuit (referred to as OTL circuit for short): a large capacitor is used to replace the transformer, as shown in the figure. T1 is NPN type pipe, T2 is PNP type pipe, and their characteristics are symmetrical. In static state, the front stage circuit should make the base potential VCC/2. Since T1 and T2 are symmetrical, the emission junction potential is also VCC/2, so the voltage VCC/2 on the capacitor, polarity is as shown in the figure. The capacitance capacity shall be large enough to be regarded as short circuit to AC signal; Switching on voltage between transistors b-e
Date: January 25th, 2008 Reading: 1154
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1、 Circuit characteristics Transformer coupling push pull power Amplification circuit As shown in Figure Z0411. Its characteristics are: (1) T1 and T2 are composed of two pipes with the same type of NPN and identical characteristics; (2) The impedance transformation is realized by using the different turns ratio of the primary and secondary sides of the transformer, and the actual load resistance RL is transformed into the required equivalent resistance through the turns ratio of the primary and secondary sides (n=N1/N2); (3) In order to reduce the crossover distortion, the base bias circuit is used in static state to make T1 and T2 have smaller collector current IC1=IC2. Since the two parts of the original winding of the output transformer (N1 and N2) have the same winding direction, IC1 and I
Date: January 25th, 2008 Reading: 1493
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In the circuit shown in Figure (a), if the switching on voltage between transistors b-e is negligible, the characteristics of T1 and T2 are identical, and the input voltage is a sine wave. When the input voltage is zero, the transmitting junction voltage of T1 and T2 is zero and both are in the off state, so the power provided by the power supply is zero, the voltage on the load is zero, and the voltage drop of both tubes is VCC. Its working principle: ◆ When the input signal makes the voltage polarity at the secondary side of the transformer to be "+" up and "-" down, T1 pipe is on, T2 pipe is off, and the current is as shown in the figure; ◆ When the input signal makes the voltage polarity at the secondary side of the transformer to be "-" up and "+" down, T2 pipe is connected, T
Date: January 25th, 2008 Reading: 2944
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As shown in Figure (a), the coupling power of single tube transformer Amplification circuit Because the resistance of the primary coil of the transformer can be ignored, the DC load line is shown in Figure (b). (uCE=VCC iCRC, RC=0, uCE=VCC.) If the loss of transistor base circuit is ignored, the power provided by the power supply is PV=ICQVCC The AC equivalent resistance from the primary side of the transformer to the load direction is Therefore, the slope of the AC load line is and it passes the Q point, as shown in Figure (b). By adjusting the transformer's primary and secondary side turns ratio N1/N2 to achieve impedance matching, the intersection point of AC load linearity and horizontal axis can be approximately
Date: January 25th, 2008 Reading: 1459
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Section I Learning Requirements 1. Judgment - judge the feedback configuration and its role on the basis of mastering the basic concepts and types of feedback. 2. Introduction -- after getting familiar with various feedback pairs Amplification circuit On the basis of performance impact, appropriate negative feedback shall be introduced as required. 3. Calculation -- master the estimation of AC performance index of deep negative feedback circuit. Key learning points: introduce appropriate negative feedback according to actual requirements. Learning difficulty: judgment of feedback configuration and estimation of performance indicators. Section II Basic Concept and Classification of Feedback 1、 Basic concept of feedback 1 Open loop amplifier or basic amplifier Figure 7.1 is an amplifier circuit with unidirectional characteristics
Date: January 25th, 2008 Reading: 1831
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Section I Learning Requirements 1. Master the circuit structure and basic characteristics of basic image current source, proportional current source and micro current source. 2. Master the definition and characteristics of differential mode signal and common mode signal. 3. Master the circuit structure and characteristics of basic and constant current source differential amplifiers, be skilled in calculating the static operating point of the circuit, and be familiar with the connection modes of four circuits and the phase relationship between input and output voltage signals. 4. Proficiently analyze the amplification characteristics and common mode rejection ratio of differential amplifier when it inputs differential mode small signal. Calculate AVD, Rid, Ric, Rod, Roc, KCMR. 5. Be familiar with the main technical indicators of the operational amplifier and the integrated operational amplifier
Date: January 25th, 2008 Reading: 2005
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Section I Learning requirements: 1. Understand power Amplification circuit The main characteristics and classification of; 2. Be familiar with the working principle of common power amplifier circuits and the calculation of maximum output power and efficiency; 3. Understand integrated power Amplification circuit And its application. Key points of this chapter: OCL and OTL power amplifiers Difficulty in this chapter: power Amplification circuit Analysis and calculation of main parameters Section II Power Amplification circuit General problems of The direct purpose of power amplifier is to obtain output power. One of its basic problems is how much signal power can be output under certain power supply conditions. Since the power amplifier needs a larger output power, of course, the power supply is also required to supply a larger injection power. Therefore, the power amplifier
Date: January 25th, 2008 Reading: 1833
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Section I Learning Requirements (1) Master the basics Amplification circuit The two basic analysis methods of GIS - graphical method and slightly variable equivalent circuit method. Be able to use graphic method to analyze the influence of circuit parameters on the static working point of the circuit and analyze waveform distortion; Be able to estimate voltage gain, circuit input, output impedance and other dynamic indicators by using the slightly variable equivalent circuit method. (2) Familiar with basic Amplification circuit Three configurations and characteristics of; Master the working principle of the working point stability circuit. (3) Master the concept of frequency response. Understand the analysis method of common emitter circuit frequency characteristics and the concept of upper and lower cut-off frequencies. Section II Semiconductor triode (BJT) BJT is through a certain process, two
Date: January 25th, 2008 Reading: 3099
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(2) Differential amplifier The solution to zero drift is to use a differential amplifier. Figure 9 shows a widely used emitter coupled differential amplifier. It uses dual power supply, in which VTl and VT2 have the same characteristics, the two groups of resistance values are also the same, and RE has a negative feedback effect. In fact, this is a bridge circuit, two Rc and two tubes are four bridge arms, and the output voltage is V. Take it out from the diagonal of the bridge. When there is no input signal, because RCl: RC2 has the same characteristics as the two tubes, the bridge is balanced and the output is zero. Because it is connected into a bridge shape, the zero drift is also very small. Differential amplifier has good stability, so it is widely used. Integrated Operational Amplifier
Date: January 25th, 2008 Reading: 1084
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Amplification circuit The purpose and composition of the amplifier are AC amplifier and DC amplifier. AC amplifier can also be divided into low frequency, intermediate frequency and high frequency according to the frequency: voltage amplification, power amplification, etc. according to the strength of the output signal. In addition, integrated operational amplifiers and special transistors are also used as amplifiers. It is the most complex and changeable circuit in electronic circuit. But beginners often encounter only a few typical ones Amplification circuit 。 read Amplification circuit The drawing is also carried out in accordance with the principles and steps of "level by level decomposition, grasping key points, careful analysis and comprehensive synthesis". First, put the whole Amplification circuit The input and output are separated step by step, and then the key points are grasped step by step to analyze and clarify the principle. Amplification circuit With it
Date: January 25th, 2008 Reading: 1229
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This power amplifier can expand the power of 1-2W and 88-108MHZ FM transmitters to 10-15W. It is composed of single tube Class C amplifier and multistage low-pass filter, and has high conversion efficiency and strong capability of wave suppression. The circuit is as shown in the figure. The high-power transmitting tube C1972 is used. Its parameters are as follows: 175MHZ, 4A, 25W, power gain ≥ 8.5db. According to the parameters shown in the figure, the working center frequency of the circuit is about 98MHZ. When the RF power of about 2W is input, the rated output can reach 15W. In order to ensure that the output reaches the rated value at any frequency point within 88~108MHZ, the center frequency of the previous stage can be
Date: January 25th, 2008 Reading: 1050
