Justin2 Posted August 9, 2020 Share Posted August 9, 2020 Why we are using to realize an IN function with diodes reversed biad diodes?I read in a book that if the present concentration of electrons is bigger than the equilibrium concentration n0(n>n0) the recombinations are bigger than the generations.I do not understand this well,generations are when electrons from the valence band are getting in the conduction band,that means in this case we have more electrons in the atom,recombination is the opposite when electrons are making pairs with holes,so some kind of neutrality,then how recombinations are bigger then generations when n>n0,concluding from my opinion it should be oposite G>R? Link to comment Share on other sites More sharing options...
Strange Posted August 9, 2020 Share Posted August 9, 2020 ! Moderator Note Moved to Physics. It is not very clear what you are asking. What is an "IN function"? Link to comment Share on other sites More sharing options...
Justin2 Posted August 10, 2020 Author Share Posted August 10, 2020 (edited) I find the answer,my question was wrong about IN function,when we use diodes to make IN function,like when in the input is all 1 the output will be set to 1 that means high,but I have seen wrong the schematic,we are using forward diodes to implement that. By the way I have other question similar to this.https://en.wikipedia.org/wiki/Diode_logic#/media/File:Diode_OR_Ideal_Diode.jpg I do not understand this well.R can return to any negative voltage. If R is connected to 0 volts it will have no drive current available to drive the next circuit; practical diodes need a bias current. In a practical circuit, all signal levels, the value of R and its return voltage are chosen by the circuit designer to meet the design requirements.R is connected to ground so the voltage is zero no current flowing to drive the next circuit,why is then R connected to ground?The other diodes are reverse biased and conduct no current.Also this how other diodes are reversed bias if we put one logic high of one diodes,for the others the anode is at low level and also cathode is negative,because of the resistor there is putting always negative voltage?We are actually in a output and input reverse? Edited August 10, 2020 by Justin2 Link to comment Share on other sites More sharing options...
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