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differential amplifier with source follower

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kickbeer

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differential source follower

hello,

look at my attachment. the output x01_in+ is shifted 180° from the input a. How to make sure so that this shifting is as low as possible? thx
 

Teddy

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differential amplifier

it's shifted since it inverted output. To minimize it use the one denoted as in- then it would be noninverted.
Infact the a is what i would call in- and b would be then in+
 

    kickbeer

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kickbeer

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differential follower

hi teddy, what is actually the function of source follower?
 

Teddy

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source follower tup

pretty much to lower signal from the level it was for another Vt.
Output from the diffamp is VDD-R*i so after SF you will have another 500mV or so down.
 

    kickbeer

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