Voltage limiter suggestion

Discussion in 'General Electronics Chat' started by sudil99, Mar 26, 2012.

  1. sudil99

    Thread Starter New Member

    Mar 9, 2012
    I have an amplifier is designed to amplify the signal so that output is max. 2.5 V because my ADC can read only upto 0 - 2.5 V. But my circuit uses +5 and -5 V supply.
    So I need a voltage limiter which can cut out output beyond that range.

    I used a resistor with zener diode of 2.7V and 3.3V, but zener diodes are not sharp at such ranges.
    Voltage divider at output doesn't work because I need only positive output.
    Currently I am using 4 diodes to limit voltage upto 2.8V and in parallel with 1 diode in opposite direction to limit voltage upto -0.7 V.

    Is there any better solution?
    (I cannot change my supply voltage because of other components)

  2. MrChips


    Oct 2, 2009
    Use a Schottky diode from signal to +2.5V supply line.
  3. Ron H

    AAC Fanatic!

    Apr 14, 2005
    If you have a dual op amp, and your signal frequency is low, you can make a precision limiter that is linear to within a few millivolts of each limit.