IF Amplifier 465 kHz another version

117

01:07:00

Two-stage CE IF amplifier for 465 kHz with about 110 dB gain and 5 kHz bandwidth. This version employs two tuned neutralizing capacitors (16.5 pF) in order to increase the available gain. The disadvantage is potential instability of the circuit (i.e., it requires precise tuning). The cascode variant posted earlier does not have this problem, and may have a slightly higher gain. However, this circuit uses less components. 

published 11 years ago

hurz

11 years ago

Yes, as you say its instable and starts oscillating at around 440kHz, anyway nice circuit!

stanislav_maslovski

11 years ago

Try now. I increased the coupling in RF transformers from 0.7 to 0.9 and tuned the neutralizing capacitors. Now if you run a transient simulation you do not see a generation, but rather amplified digital noise, I think. The amp is too sensitive, anyway ;)

hurz

11 years ago

Great, i wish EC would have buildin resistance as tuneable properties of inductors to tune Q for tank circuits proper. Please keep it up!!!

stanislav_maslovski

11 years ago

Yes, that would be very handy.

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