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Dennis Feucht

Diff-Amp Uses a Resistor Network

Dennis Feucht
sroochi
sroochi
5/5/2016 6:58:39 PM
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Re: Diff amp inputs that extends input common mode range
I have used this technique to create a product, IX6R11S3, a 6Amp high side/low side gate driver with +/-600V high side to low side gate drive swing capability about 10 yrs ago.  I was granted a patent, #6759692, "Gate Driver With Level Shift Circuit," issued 10/23/03.  

Enjoy,

Sam Ochi

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traneus
traneus
4/29/2016 12:54:03 AM
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Re: Diff amp inputs that extends input common mode range
sroochi's +/-1200-volt on-chip common-mode-range differential input: Excellent!

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sroochi
sroochi
4/28/2016 5:53:45 PM
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Newbie
Diff amp inputs that extends input common mode range
Interesting article!  As you are aware, this circuit was used by Analog Devices and National Semiconductor some ~30yrs ago.  Worked well then, and probably better today with today's better OP amps.

I used this circuit when I designed my high side/low side gate driver input stage.  I needed fully differential performance to +/-1200V -- using only 30V Vbdss devices with similar gate to substrate breakdowns.  It was a simple matter of using a pair of matched 1000:1 attenuation networks (..placed in front of the differential amplifier circuit) created with poly silicon resistors over thick field oxide -- 2um thickness (thermal oxide has a breakdown characteristic of ~ 100V/.1um.)  

All the Best,

Sam Ochi

 

 

 

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