Is there any detailed information on what does it mean to amplify the power?

The output power of this competition is very small, and even "power" cannot be talked about, and the general RF power has to pass one watt before entering the threshold.

What is the capacitance and resistance between the first and second pins of the 3842? What do the obscure words such as error amplifier, gain, and frequency response mean?

Magnification of magnification. For example, if the signal is 10mv and 1v, then the gain is 100

In the process of using bai, the gain is generally represented by dbIt can be calculated using the following formula.

1) For: DAO voltage gain or current gain: au(db)=20*lg(y)y=uo uiThe previous result is 40db

2) For power gain: a(db)=10lg(y) If a circuit, the power gain is 100 times, then it is equivalent to 20dB

In terms of gain calculation, the numerical expression of gain is equivalent to that of DB.

Gain refers to amplification.

The BAI device can increase the amplitude of the signal in what magnitude. This parameter is often measured in decibels (db). Use mathematical language.

In other words, the gain is equal to the output amplitude divided by the input amplitude. (For power amplifiers, the gain expressed in decibels can be calculated by this relation: g(db)=10log(pout pin)(electrical)).

The electric amplifier pout pin is the output and input current ratio, and the optical amplifier pout pin is the output and input light intensity ratio.

The power amplifier is to amplify the specified low-power signal with the help of applied electricity, and the signal amplification needs to consume the applied power, so it does not violate the law of energy conservation.

The power of the pickup signal cannot drive the destination device, and its voltage and current should be amplified to the desired values.

The power amplification circuit is to amplify the voltage and current at the same time, p=iv

Gain generally refers to voltage gain, your so-called gain amplification, I personally feel that it is not very rigorous, and it is more appropriate to use voltage gain amplification. It is understood literally that it means only an amplification of voltage, but there is not the slightest mention of the current, that is, the current is likely to remain the same, and may even decrease. Voltage gain amplification is generally used in small signal processing circuits, or intermediate stages of amplifier circuits, which are usually composed of one-stage or multi-stage co-emission (source) amplifier circuits or proportional arithmetic amplifier circuits.

In this kind of circuit, the voltage may not be amplified (such as a simple OCL OTL circuit), or it may even be slightly reduced (the voltage gain is in, that is, a small attenuation), but because the current is increased a lot, it can be used to drive heavier loads. The power amplification circuit is generally used for the final stage or output stage of the amplification circuit, and is usually composed of Class A, Class A and Class B power amplification circuits.

One is potential [voltage] amplification, and the other is current amplification.

The power amplification circuit P=UI, not only amplify the voltage but also amplify the current, the output impedance is small, and the output voltage will not drop with load.

Voltage amplification circuit only amplify U, the output impedance is large, when the load is very small impedance, the output voltage drops a lot, as can be seen from the calculation formula of the amplification of the basic amplifier.

The maximum undistorted output voltage is generally not compared, and the power amplifier circuit only talks about the maximum undistorted output power.

1.An electronic device usually contains a multi-stage amplification circuit, in addition to the voltage amplification of the small signal of the pre-amplification circuit, its output stage generally has to drive a certain load, such as speakers, relays, motors, instruments, deflection coils, etc., to drive these loads (actuators) all need a certain power, so the power amplification circuit that can amplify the large signal is required, in order to efficiently convert the direct current energy into alternating current energy according to the input signal.

The voltage amplification circuit is mainly used to amplify the voltage signal, and the main issues considered are the voltage amplification factor and frequency response. The power amplification circuit aims to obtain the maximum output power, that is, it requires not only a sufficiently large amount of voltage variation, but also a sufficiently large amount of current variation.

Compared with voltage amplifier circuits, power amplifier circuits have four characteristics and requirements:

1) The output power should be as high as possible.

Maximum output power p om = maximum output voltage rms value Maximum output current rms value.

2) Be efficient.

p om p v

where the efficiency of the power amplifier circuit.

POM – Maximum output power.

p v – the DC power supplied by the DC power supply.

p v = average current supply i c of the supply voltage u cc in a week.

3) The nonlinear distortion should be small.

Nonlinear distortion is inevitable when transistors are operating near the limit state, and measures should be taken to avoid excessive distortion as much as possible.

4) In the actual application circuit, the transistor should be equipped with a heat sink and overcurrent protection link.

Classification of work status.

According to the conduction of the transistor in the whole cycle of the sinusoidal signal, it can be divided into several working states:

1) Class A: all conduction in one cycle, the conduction angle is equal to 360 degrees.

The quiescent operating current i cq i cm (signal current peak) and voltage amplification circuits fall into this category.

2) Class B: The conduction angle is equal to 180 degrees.

i.e. i cq =0 , the transistor is only on for half a cycle.

3) Class A and B: The conduction angle is greater than 180 degrees and less than 360 degrees.

i.e. 0 i cq i cm

4) Class C: Conduction angle less than 180 degrees.

2.: Circuit function: The voltage amplification circuit is to amplify the weak signal (large gain); The power amplifier is the power supplied to the load (high power).

Circuit form: the form of voltage amplification circuit is resistor-capacitance coupling or direct coupling; The circuit form of the power amplifier is transformer coupling or OTL, OCL circuit. Tube working condition:

In the voltage amplification circuit, the tube works in Class A; The tubes in the circuit of the power amplifier work in Class A, Class B, Class A and B. Tube working range: the tube works in a small interval in the voltage amplification circuit; The power amplifier circuit is operated at the limit of the tubes.

Analysis Tools: Slightly variable equivalent method in voltage amplification circuits; The first method is used in the circuit of the power amplifier. Waveform Case:

The nonlinear distortion in the voltage amplification circuit is small; Nonlinear distortion in the circuit of a power amplifier. And also.

The essence of the amplification circuit is the rotation of BAI energy.

DU exchange and control circuits. From the perspective of energy conversion and control, there is no essential difference between the power amplifier and the voltage amplifier, and the main difference between the voltage amplifier and the power amplifier circuit is the different tasks completed.

The task of a voltage amplifier is to amplify the input voltage; Whereas, the power amplifier circuit is to amplify the input power. In the process of working, the power amplifier circuit not only pursues the output of high voltage, but also pursues the output of as large power as possible under the condition that the power supply voltage is determined. As a result, the power amplifier circuit contains a series of special problems that do not occur in the voltage amplifier circuit, namely:

..See.

The voltage amplification circuit mainly ensures sufficient gain (low distortion) to propel the amplifier.

The power amplification circuit mainly provides a large current conversion (amplification) to drive the load.

One is to amplify the voltage, and the other is used to amplify the current after the amplified voltage, and only after the voltage is amplified can the current be amplified, and the power can be amplified after the amplification of the current!

The power amplification circuit is to amplify the voltage and amplify the current, and the voltage amplification circuit is only to amplify the voltage.

Transmitters, high-frequency welding machines, detectors.

It is a class C frequency selective amplifier.

The resonant load is the LC parallel resonant load.

After resonance, the resonant current is at its maximum in the voltage of the LC parallel resonant load, and only he is amplified. Therefore, the power can be amplified.

Hence the name, the power amplifier is to amplify the power charge rate of the small signal. Generally, it refers to the audio power amplifier, which not only amplifies the signal voltage, but also amplifies the current. In other words, after the power is amplified, it is necessary to output not only a certain voltage, but also a certain current.

For example, the general amplifier signal input is 1V, the input impedance is =1, 47000=2x10 -6W, which is equivalent to 2 microwatts, if the output is 100W, the impedance is 8 ohms. The power is amplified by 5x 10 8 times.

The function is to amplify the small signal and output a large signal of a certain voltage and current for high-power loads.

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