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Troubleshooting Diode Circuit with DC and AC Voltage Sources: Need Help?
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[QUOTE="Rampart, post: 4906991, member: 529037"] Sir at first let me thank you for your reply...In my attempt to understand what you told me i am pretty sure i burnt many brain cells..So Mr Rudeman(or any1 who has the mood) i have many questions so let me start from the beginning: [B]<<In determining the diode dynamic resistance r,where did you get the 0.7V?The 4 mA?[/B] The as source gives maximum Vm=0.1V,so it is not possible to get 0.7 just from that.The main source is the dc source which gives steady 2V.But the AC source adds as well,does it not? [B]<<1. Determine the diode dynamic impedance r = ∂I[SUB]d[/SUB]/∂V[SUB]d[/SUB] at the 2Vdc input level of the diode when V[SUB]ac in[/SUB] = 0. Use the standard I-V diode relationship for a junction diode>>[/B] ok why i should take that AC source is 0?In order to use this equation dv/di=R,must i have only the DC source? Is it because R is a constant only when the as source is 0?Only when there is a linear relation?Do i get from the graph that AC must not be taken into account?I am just posting some thoughts i have into mind... << [B]2. Then it's a linear problem if you neglect the small changes in r with input ac voltage. The dc diode current and dynaminc impedance do not change significantly with ac input voltage (why?). The diode ac current is determined by r and the 100 ohm resistors. Have fun! >>[/B] I take that AC source is 0,because its voltage is too low so that it doesn't really make any difference?That is why in the graph there is a linear relation between id and vd? And now the thing i do not have a clue about.<<The diode ac current is determined by r and the 100 ohm resistors>>.If i regarded AC source is 0,why should i find the ac current?Wouldnt it be id=idc+iac ~ idc(where idc is the current that is <<produced>> only by the dc source). Do id and vd change through time just because of the ac source?I know these questions are many and too simple for most of you,but it is the only way to build myself. Feel free guys to answer whenever you want and can. [/QUOTE]
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Troubleshooting Diode Circuit with DC and AC Voltage Sources: Need Help?
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