Designation of a negative clamping circuit. please help.

Replies

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  pratik_ghatwai

  i think .........there is nothin to do with capacitors...........you just add the 30 volt battery in your circuit............then you will find your circuit giving you -10 v..............and see the working of clamper circuit in any book,,,,,,you ll b able to kno why i m telling you to add 30v battery below th diode used ,.
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  mkaras

  Cucumber:
  
  Your clamping circuit can be built using a concept as I'll describe. You'll select a capacitor to AC couple your 20V to -15V signal @ 10KHz into the clamp circuit. The clamp circuit itself can be built a couple of ways. One simple way is to use a diode if absolute accuracy is not your ultimate goal. The diode is connected cathode to the output side of your AC coupling capacitor and the anode side is connected into a circuit that has a voltage level approximately one diode drop above the clamp level that you wish to attain. In operation the charge across the AC coupling capacitor adjusts so that the output only swings down to the -10V level. You have to select the AC coupling capacitor so that it is big enough to permit the 10KHz signal to pass through the circuit without significant attenuation. LTSpice is a handy free program to help evaluate circuits like this.
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  mkaras

  
  
  
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  sauravgoswami

  Hi mate,refering to your waveform it is clamping both V+ and V-,by 4volts can u explain??,as far as i know it shud clamp only negative voltage
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  mkaras

  I am clamping the negative peak of the signal to a specific level without attempting to change the amplitude of the signal. In order to clamp only one level and leave the other peak the same as the input in terms of its absolute voltage level then one must start with a DC coupling of the signal.
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  sauravgoswami

  so ur clamping an AC signal,ok,i thought u were clamping DC signal,anyhow then it ok!!