I have simulated a class A RF amplifier. When I simulated the output impedance, it is around 50ohms for the frequency range that is of interest(50kHz to 100MHz), now at the input impedance is around 56 ohms and then it dips, how can I stabilize it to 50 ohms for the entire range?

Regarding the question asked by Tim Williams, I do not know how to ensure the flatness to the output...

Another good point that was raised is that the output impedance was simulated with the 50 ohms attached to it... Without the 50 ohms, the output is different.

I am assuming that I will need a matching circuit at the output as well...

I believe maybe a Pi-network can work for this but I am unsure. Also, the characteristic impedance is around 65ohms, but if I want to split it to a Resistance and Reactance, would that help?

Input Impedance:

Here is the circuit in question. I modified it according to GodJihyo.

I have simulated a class A RF amplifier. When I simulated the output impedance, it is around 50 Ω for the frequency range that is of interest  (50 kHz to 100 MHz), now at the input impedance is around 56 Ω and then it dips, how can I stabilize it to 50 Ω for the entire range?

Regarding the question asked by Tim Williams, I do not know how to ensure the flatness to the output...

Another good point that was raised is that the output impedance was simulated with the 50 Ω attached to it... Without the 50 Ω, the output is different.

I am assuming that I will need a matching circuit at the output as well...

I believe maybe a Pi-network can work for this but I am unsure. Also, the characteristic impedance is around 65 Ω, but if I want to split it to a Resistance and Reactance, would that help?

Input Impedance:

Here is the circuit in question. I modified it according to GodJihyo.

I have simulated a class A RF amplifier. When I simulated the output impedance, it is around 50ohms for the frequency range that is of interest, now at the input impedance is around 65 ohms and then it dips, how can I stabilize it to 50 ohms?

I believe maybe a Pi-network can work for this but I am unsure. Also, the characteristic impedance is around 65ohms, but if I want to split it to a Resistance and Reactance, would that help?

Here is the circuit in question.

I have simulated a class A RF amplifier. When I simulated the output impedance, it is around 50ohms for the frequency range that is of interest(50kHz to 100MHz), now at the input impedance is around 56 ohms and then it dips, how can I stabilize it to 50 ohms for the entire range?

Regarding the question asked by Tim Williams, I do not know how to ensure the flatness to the output...

Another good point that was raised is that the output impedance was simulated with the 50 ohms attached to it... Without the 50 ohms, the output is different.

I am assuming that I will need a matching circuit at the output as well...

I believe maybe a Pi-network can work for this but I am unsure. Also, the characteristic impedance is around 65ohms, but if I want to split it to a Resistance and Reactance, would that help?

Input Impedance:

Here is the circuit in question. I modified it according to GodJihyo.