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Extend input voltage range of standard op amps

Posted: 19 Apr 2011     Print Version  Bookmark and Share

Keywords:bootstrap  CMOS op amp 

Using its own output to bootstrap a low-dropout voltage regulator (MAX6771) with high input-voltage range (up to 76V), the circuit described in this application note extends the input range of a CMOS op amp (MAX4162) while preserving its high input impedance and low input bias current (< 1pA).

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