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Thanks ! Well, so I've to find out why transfer function of my amplifier (Pout vs Pin) is not straight line in linear part of the characteristic. I thought, that the reason is behind class of this amplifier which is "B" configuration (difference between 1dB and Psat is almost 7 dBm).
Hello All,
I've fast question, because I want to be sure about my thouths. Let we take under consideration three amplifiers working in A, B and C classes. In every case, the saturation power is the same. It will be true if I will conclude, that for A class the 1dB compression point will be the...
Hello Andre,
thank you for the response.
You're absolutely right, so can we "shift" this topic to IC Analog sub-forum ?
Ok, but I don't get it... I mean, why - if this is case where biasing is most significant, why they haven't use two transistors with the same sizes ? I'm wondering how this...
Hello all,
I found some schematic of cascode amplifier:
I'm just wondering why authors used transsistors having different parameters. Such configuration have some advantages in terms of operational banwdwidth or what ?
Best Regads,
Tom
Ok... but if I calculate Q factor for the case 54/50 I'll still have value smaller than unity, right? I mean Q= sqrt((54/50) -1) is about 0.28. I'm wrong? By the way please confirm that I undersand it in proper way - this equation is related only with L network ?
FvM Thank you for reply. I sometimes use this website :) Well, I know that for pi and T topologies Q factor can be quite big. I just want to check how complex output impedance change the Q factor so this is the reason why I ask for that. Moreover, i was wondering how to calculate case where Zout...
Hello,
I've short question related to Q factor of PI match circuit. I'm quite confused, because in every pdf and book I see matching between resistances. The equation for such case is: Q = sqrt((Rout/Rin)-1). What if i calculate this parameter for Rin=50ohms and Rout = 100+i43 ohms? Should i...
Hello everyone,
I want to consult with you my doubts which appeared during design of Doherty amplifier. I'm designing simple configuration consisting of AB and C amplifiers. Schematic of single amplifier which I used for a carrier and an auxiliary amplifiers looks as follows:
So, for such a...
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