How to bias Gilbert mixer
I am designing a conventional Gilbert mixer, I am biasing the circuit to guarantee all switch transistors operate at saturation region. Is it right?
anyone can tell me ?
Thanks a lot !
guilinwxb
Hi, I think the purpose of biasing the switch transistor is to switch them easily.
In other words, they will be turned on or off quickly.
So they should be biased at the saturation region.
And at the same time, you must confirm the RF input transistor operate at saturation region.
Make Vds≥Vgs.
Thanks jecyhale.
I found the IIP3 of the mixer is increase when the Vds of switch transistor is increase...
Is that because of the increase of the Gm
Why in saturation the switch is turned on/off faster?
And I think the switches should be biased(DC) between on and off region,not saturation and linearity region
Added after 47 seconds:
what is this Vds?AC amplitude or DC?
Why in saturation the switch is turned on/off faster?
And I think the switches should be biased(DC) between on and off region,not saturation and linearity region
Added after 47 seconds:
what is this Vds?AC amplitude or DC?