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hello
what is better in mixer to mix with sine LO or square wave LO ?
what is the effect in both on the Gain , linearity(IIP3), Noise figure
thanks in advance
From a noise point of view, it is definitely better to mix with a square waave LO. This reduces the flicker noise dramatically ( you can refer to the classic paper on noise in mixers by Hooman Darabi; it's titled "Noise in RF CMOS mixers; a simple physical model" )
I think the effect on gain will be minor. Because even when you use a sine wave, the actual mixing process will be approximately a multiplication with a square wave ( assuming a small switching transient )
Effect on IIP3 is rather not clear however. You'd better find out yourself by simulation
the square wave mixing will generate alot of harmonics , to be filters out
the sin wave mixing will not gnerate these harmonics
but square mixing is better in performance in general
the PSS, PAC analysis go longer and longer till i stop it
i could'nt see neither the IIP3 or even 1dB comp point remain long time unlimited
did you tried mixer with squar wave on spectre RF..?
thank you all for your help
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