Design of high frequency small signal resonant amplifier course design Multisim Simulation

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One 、 Theoretical knowledge of high frequency small signal resonant amplifier

1、 Brief introduction of high frequency small signal resonant amplifier （ A little ）

2、 Classification of high frequency small signal resonant amplifiers
It is divided into ： Transistor amplifier 、 FET amplifier 、 Integrated circuit amplifier ;
It is divided into ： Narrow band amplifier 、 Broadband amplifier
It can be divided into ： Single stage amplifier 、 Multistage amplifier
It can be divided into ： Resonant amplifier 、 Non resonant amplifier

3、 Characteristics of high frequency small signal resonant amplifier
（1） High working frequency , The center frequency ranges from hundreds of kHz to hundreds of MHz
（2） The transistor operates in the linear amplification region
（3） The load circuit is a resonant circuit , It has the function of amplification and frequency selection

4、 Main quality indexes of small signal tuning amplifier
（1） Resonant frequency f_0（ A little ）
（2） Resonance gain A(V)（ A little ）
（3） Passband BW（ A little ）

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Two 、 Design content of high frequency small signal tuning signal amplifier

1、 Given the conditions

2、 Main technical indicators

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3、 ... and 、 The design process of high frequency small signal tuning signal amplifier

1、 Select the circuit form
According to the requirements of technical indicators , Consider the basic characteristics of high-frequency amplifier , Common emitter transistor single coordinated loop resonant amplifier can be used , The design reference circuit diagram is shown in the figure 2 Shown .

Because the signal is small , It can be considered that it works in the linear range , The transistor can be regarded as a linear element , As an active linear four terminal network , Need to mix The parameter model is converted to Parameter four terminal network model solution .

2、 Set the static working point

3、 Calculate the parameters of resonance circuit
（1） Transistor mixing Parameters

（2） Common emitter transistor input admittance

（3） Output admittance of common emitter transistor

（4） Forward transfer admittance of the common emitter transistor

（5） Total capacitance

（6） Calculate the number of turns of the loop coil

（7） Determine the coupling capacitance and high-frequency filter capacitance

4、 Determine the required components （ See report for details ）

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Four 、 High frequency small signal resonant amplifier circuit simulation experiment

1、 Circuit simulation
According to the design content , stay Multisim Draw the circuit diagram , And simulate , The circuit diagram is as follows ：

On the basis of the original circuit , Add an oscilloscope and a baud grapher , In order to detect whether the circuit meets the requirements .
2、 Simulation results
（1） The input and output waveform observed by the oscilloscope is ：

It can be calculated from the graph

Meet the design index of magnification , And the input and output waveforms are not distorted .
（2） The Bode diagram is as follows ：

It can be calculated from the graph , The passband is about

stay 1MHz about .
Sum up , This circuit design basically meets the requirements .

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5、 ... and 、 Experience
This big assignment , I revisited it 《 High frequency electronic circuit 》 Content of medium and high frequency small signal resonant amplifier . In the process of completing the big homework , Due to lack of understanding of devices , as well as Multisim Software usage has been somewhat forgotten , There are also some details that have not been noticed , So the progress has been slow . But by looking up some information on the Internet , And the communication with classmates , Finally, I got the circuit that basically meets the design requirements . Through this course design , I have a deeper understanding of the design method of high frequency small signal tuning amplifier , Master the calculation and conversion of equivalent circuit of high-frequency single tuned amplifier loop , Performance index and analysis design , Master the central frequency , Magnification , Loop bandwidth The test method of , Benefited greatly .

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