The difference between active and passive mixers

hi all,

wanna know the difference between active and passive mixers (like how the gate n drain biasing will be in both) n which one is better?

Hi Deepti,

Are you looking at any specific family of mixers? Can you be more elaborate..?

Sai

Added after 13 minutes:

Hi Deepti,

Will this serve our purpose..?

the active mixers , based on varaiying the transconductance of the device sou can get gain

in passive the resisantace of the device varaied , so theere will be a loss

but usually the gates bias arround vth of the dvice

khouly

for FET mixers

negative gate bias needed in both cases. For active, drain bias and for passive no drain bias.

Passive: lower noise, lower IM, conversion gain very dependent on gate bias so gate bias control very critical

Active: higher noise, higher IM, conversion gain less dependent on gate bias so gate bias control not so critical

thanks all..

in continuation to the above question...
what kind of model can be used in designing passive mixers..i have curtice cubic model for our foundary..but i wanna ask..whether the same model can be used for both active and passive mixers or some parameters of the model should be changed. If yes, what are those parameters?

thanks