Only about 15dB, up to about 25MHz, not quite the 20dB (with R1=430Ω R2=47Ω) that 1+R1/R2 says it hypothetically should be, and given that fT is 250MHz for that transistor, about what would be expected.And we see that there is no voltage gain. There still may be current gain and/or power gain. I have not work with these GP transistors in that frequency range.
Sorry, I meant from the final output stage. Yes, the gain comes from the Class A stageOnly about 15dB, up to about 25MHz, not quite the 20dB (with R1=430Ω R2=47Ω) that 1+R1/R2 says it hypothetically should be, and given that fT is 250MHz for that transistor, about what would be expected.
This is the frequency response SPICE gave me. I'm not really interested in 100MHz circuits, but the same circuit is used in audio. If you want a gain of 10 at 100MHz, you'll need some transistors with ft=1GHz.@Ian0 Thank i will try it
by Jake Hertz
by Jake Hertz
by Jake Hertz