The difference between active and passive mixers

[deeptimongia]

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??

 

[raghuram_msc]

Re: mixers

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..???

 

[khouly]

mixers

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

 

[toonafishy]

Re: mixers

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

 

[deeptimongia]

Re: mixers

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