How best to simulate a small tuned amplifier in multisim 12

[gringo8217]

Hi

I wonder if some one could help with regards to the simulation of my tuned amplifier circuit , I am unsure of how to get the best simulation and waveform for the circuit , I know how the ideal should be but I can not seen to get the ideal or anywhere near ,I have experimented with certain analysis and still seem not to get quite near can some one explain what I am doing wrong.

                                                                                                    Thanks

                                                                                                     gringo

[Clad19]

Hi Gringo8217,

Thanks for posting on the forums.

I wanted to find out some more information from you regarding this Multisim simulation.

- Exactly what type of waveform are you expecting? What values are you trying to get?

From looking at your circuit design it looks like there is a resistor missing (R1 considering the below image). Take a look at the following diagram of a tuned amplifier and compare your design. It may be of help. 

If you could provide more information, I will then be able to help you further. 

Kind Regards,

[gringo8217]

Hi

Thanks for the reply ,the amplifier is given to me too simulate the circuit the missing R1 as you suggested is not to be used , i am un sure on the output and the best way ti simulate can you advise ?.I have simulated but unsure on the output if it is correct or not .

                                                                      Thanks

                                                                       gringo 8217

[johnsold]

If R1 is missing from the circuit which Dominic C. posted, then the circuit is probably operating in Class C. That means that the transistor only conducts during a small portion of the input cycle when the instantaneous signal voltage is larger than 0.7 V.  Class C is used for power amplifiers because it can be quite efficient.  It relies on the Q of the tank circuit to store energy and generate a (nearly) sinusoidal signal at the output.  If the Q is too low, harmonics and reduced efficiency may occur.

Try driving it with an input signal of at least 1 volt peak.

Lynn