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Voltage Conversion Gain Mixer (Read 3258 times)
DDC
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Voltage Conversion Gain Mixer
Nov 27th, 2012, 12:03am
 
Hello,

I want to measure the voltage conversion gain of my gilbert cell downconversion mixer (frf = 2.4GHz, flo = 2.34GHz). I think I can only measure the power conversion gain with a spectrum analyzer. Is there an equation to calculate the vcg from s-parameters or an other method to evaluate this ? Thanks for response.
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rfidea
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Re: Voltage Conversion Gain Mixer
Reply #1 - Nov 27th, 2012, 11:35am
 
Use the relationship between voltage and power, P = Vp^2/(2R). So, is your source resistance is RS and the load resistance is RL the voltage gain is

Gv = Vout/Vin = sqrt(Pout*2*RL)/sqrt(Pin*2*RS) = sqrt(Gp)*sqrt(RL/RS)

or in decibel

Gv,dB = 20*log(Gv) = 10*log(Gp)*10log(RL/RS) = Gp,dB*10log(RL/RS)

Usually both your signal source and spectrum analyser is 50 ohm. Is your inputs and outputs designed for handling that?
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