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Basic Diode Question - find the diode current of the diagram

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ivanljh

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Basic Diode Question

Can anyone show me the step by step working to find the diode current of the diagram below? Thanks.

81_1235279834.jpg
 

Re: Basic Diode Question

assume diode forward biased, forward diode drop = 0V. Iyz = 2mA. Ixy = 1mA. our diode current direction does not contradict the sign of our current. hence, Idiode = 1mA.
 

Re: Basic Diode Question

amriths04 said:
assume diode forward biased, forward diode drop = 0V. Iyz = 2mA. Ixy = 1mA. our diode current direction does not contradict the sign of our current. hence, Idiode = 1mA.

Wouldn´t it be better to assume a more realistiv value than 0 volts (for example 0.65 volts) ?
 

Basic Diode Question

You should also include the forward bias series resistance in addition to the 0.7V of the PN junction.
 

Re: Basic Diode Question

Hello,

You can reduce the batteries and R's to its Thevenin equivalent. After that use the diode model you like: Ideal, Constant Voltage, Constant V and R drop or any non-linear equivalent.

Hope this helps and kind regards!
 

Re: Basic Diode Question

Hi
Actually, I think it's better to follow the " Superposition " theory to solve this ploblem.
After that, assuming diode to be whether forward-biased or so, can help make it easier to continue solving.
Anyway, the Thevenin would also be useful too.

Hope I've helped.
 

Basic Diode Question

Should the diode not be the other way round?
 

Re: Basic Diode Question

It could be, but the sources are also connected + and -.
 

Basic Diode Question

So they are, must be getting blind in my old age. Silly me.
 

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