# Bulk driven MOS. Flow of current direction

1. ## Bulk driven MOS. Flow of current direction

Hi

I have read about bulk driven MOS in research article it was written that applying input to the bulk removes the threshold voltage from the signal path. How is it possible?

It was also writren that small voltage should apply at the gate to generate a small inversion layer.

Normally in normal gate driven technique we apply gate voltage channel forms and current flows between drain and source.

What will this bulk driven do how the current flow. Will it flow between bulk and drain? I can understand. What will the ac current and dc current work.

Can someone explain ac and dc current flow seperately. Or suggest some good basic paper?

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3. ## Re: Bulk driven MOS. Flow of current direction

The diagram is not clear in this paper.can you provide some other paper

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4. ## Re: Bulk driven MOS. Flow of current direction

Which one is not clear?

5. ## Re: Bulk driven MOS. Flow of current direction

I cant understand its not defining the bulk driven technique what happens when input is applied to the bulk

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6. ## Re: Bulk driven MOS. Flow of current direction

I did not read this, but it seems there is an explanation that there are two BJTs in the bulk. Moreover, a circuit with the input-differential pair using bulk technique is presented and described. I do not think I can help you more. My apologies.

7. ## Re: Bulk driven MOS. Flow of current direction

I would try a simplified answer.

In useful bulk driven operation, the current is still in the channel, the bulk junction should be reverse biased. You'll apply a gate bias voltage that allows channel current flow with reversed biased bulk.

You effectively get a FET with an additional junction insulated gate (like JFET), review basic MOSFET literature or SPICE simulation models how the combination of Vbs and Vgs is setting Id.

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