Generating a rippled voltage supply

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The discussion focuses on generating a rippled voltage supply using a BJT power follower in SPICE simulation. The user seeks guidance on modeling the circuit with a sinusoidal input of 200mV amplitude and a frequency range up to 20 MHz, aiming for a flat output voltage around 3.3V while handling a load that sinks up to 1A. A suggestion is made to DC couple the output by removing a capacitor, which would allow both AC and DC components at the output. The user is currently experimenting with different NPN BJTs for the simulation. Overall, the conversation emphasizes the importance of circuit configuration and component selection in achieving the desired output characteristics.
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Sure. You want to model a BJT power follower in SPICE? Can you post a copy of your SPICE deck?
 
im thinking of a schematic like this with vin as a varying sinusoidal input(0-20 Mhz) of amplitude 200mv. I want vout to be reasonably flat across this range.Also at my output id like to have a DC of around 3.3V. It is also worth noting that my load sinks up to 1A of current.Is it worth a shot?
 

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That's a good start for a circuit to simulate, but I'd DC couple the output (delete C3). Which NPN BJTs were you thinking of simulating?
 
i see...deleting C3 would let me have AC and DC at the output!
as for the type of NPN to use I am not really sure,right now its trial and error
 

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