linear power amplifier with pulse VCO

[goatmxj666]

hello,

I want to design a power amplifier that operates at 5 GHz.

The output of the VCO circuit that I can use is a pulse signal with 5 GHz.

If the output of the VCO is a pulse, then do I have to use a non linear power amplifier only?

Can I use a linear power amplifier with an LC filter after it to make it a sine wave?

 

[BradtheRad]

The LC second-order (low-pass) filter is effective at shaping a waveform into a sine wave, if resonant frequency matches incoming frequency.

L & C values need to be customized to your load and frequency.

It's possible to build a sine-wave oscillator which automatically detects LC resonant frequency, and creates oscillations at that frequency through your load.

Of course there's a challenge operating at 5 GHz more so than at slower frequencies.

 

[vfone]

I think the output of your VCO is not a pulse, but it is a square-wave signal.
Yes, you can use an LC filter (LPF or BPF) at the output of the VCO to make it sine wave.

 

[KlausST]

Can I use a linear power amplifier with an LC filter after it to make it a sine wave?

IF you use an external power amplifier than I recommend to put the filter in front of the amplifier.

Klaus