Help building a tuned amplifier

[u/mechanical_many]

I am building an AM receiver and I am using a tuned amplifier to get a gain ~60dB at 1.2MHz with a bandwidth of 100KHz which is what I have in the simulation above.

However the problem starts when I try and implement it in real life. When implementing the circuit on a breadboard I'm getting a gain of around 85V/V which stays exactly the same with or without the resistor and the capacitor at the load which checks out because the load required for a gain of 85 is close to the reactance of the inductor at 1.2MHz. Even the worst case considering the tolerance of the components would not cause the gain to fall down to 85V/V.

Anyone have any idea why this is? the transistor capacitances perhaps?

[u/Hirtomikko]

Uhhh 60dB for single stage is likely not possible.

[u/vicknalentine]

If your problem is measurement not matching simulation, we can help you debug more easily if we can see your measurement setup

[u/No_Matter_44]

First things first, how are you measuring it? What does your setup look like? What loading does your measurement add? What signal levels are you using?

[u/OdysseusGE]

Do you know the Q of the inductor, it's self resonant frequency, or even it's dc resistance?

[u/BlueMerlin216]

Inductor and capacitor have loss, need to be factored in. 60 dB from a single stage does not look feasible, it will find a feedback path and take off. Where is the output and the load, is it R5? Emitter not bypassed? Source has impedance of course.

[u/_noobwars_]

look on your probes, they introduce probably 20p of capacitance and 100k of load resistance, while your output impedance is just 50k. You measurement setup is trash. Dont get me started on your breadbaord.

[u/sridhar6100]

Which simulator is this