Common collector amplifier and amplitude modulation

On Sunday, 14 April 2019 21:41:59 UTC+1, George Herold  wrote:
> On Friday, April 12, 2019 at 11:19:04 PM UTC-4, daku...@gmail.com wrote:

> > Could some electronics guru here shed some light on this Could a single stage common collector amplifier exhibit amplitude modulation ?
> > 
> > I have the SPICE model of a simple common collector amplifier
> > consisting of two base bias resistors, a collector resistor and an input and a output DC blocking capacitor, as well as a source and 
> > a load resistor of 50.0 Ohm. The BJT collector is connected to Vcc via a RFC coil. I have tried input signal frequencies from 100 MHz 
> > to 750 MHz, with SPICE transient analysis. Each time, I have seen a 
> > output signal envelope, at the same spot on the time axis. I have
> > tried several common RF|microwave transistors as BFR92A, BFS17, 
> > BFQ67W and HFA3134, but the bproblem is always there. 
> > 
> > All hints and suggestions are welcome - thanks in advance.
> 
> Hmm I'm thinking you need to down load LTspice and post *.asc
> schematics.  
> 
> George H.

or just a sketch


NT