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operating point data contradicts region data

yefJ

Hello, i am trying to bias my mixer transistors to be in saturation (region 2)

The operating point data shown bellow fits the conditions of saturation, but my transistor region status is 1(linear) as shown in the table bellow.

where did i go wrong?

Thanks 

Vd=126m Vg=780m Vs=100m Vth=657m

Vgs=780-100=750m >Vth=657m

Vdg=126m-780m=-654m>-657m

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  • Dear yefj,

    When I examined the DC operating point information, it appears the value of vdsat is 110.237 mV. Since the value of vds is 26.38 mV, vds < vdsat, and the operating point is classified as region 1 - or its linear region and not its saturation region. For short channel devices, the value of vdsat is not the difference between vgs and the threshold voltage. I was unable to determine the channel length of your device from your snapshot, but based on your Spectre operating point information, I might suggest this is the reason for its classification.

    Shawn

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