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for help: Bias condition of LO switch pair of Gilbert mixer

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wireless man

wireless man

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hi, Does anybody can tell me what bias conditon of the LO switchpair should be ? Some body tell me that the LO switch pair should be biased at Vgs ≈Vth, and smaller than Vth. Do you think it is right or not?
Thks.
 

Re: for help: Bias condition of LO switch pair of Gilbert mi

wireless man said:
hi, Does anybody can tell me what bias conditon of the LO switchpair should be ? Some body tell me that the LO switch pair should be biased at Vgs ≈Vth, and smaller than Vth. Do you think it is right or not?
Thks.
Click to expand...

Vgs≈Vth or not is detemined by the MOS size and current. NOT the bisa condition.

In my opinion, you should quarantee the Vds >Vgs.
 

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