Could anyone give me a method to generate the 3GHz quadrature source? Since I need to use the quadrature LO signal to test my quadrature upmixer. I just find signal generator just generates baseband (low frequency) quadrature source.
If you use differential divider by 2 circuit and then if you put a Polyphase filter to correct the phases, you may obtain impressive quadrature signals.
But your VCO should work 2 times higher than operatiing frequency..
Or design a quadrature VCO directly but it's difficult to realize..