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Diode forward voltage drop circuit

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areebaa

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Hi,
I would like to design a basic ciruit which gives the voltage drop across diode.
I am usng R=1K , V=5V , and diode in series and checking the voltage across diode. is this meathod correct ? or please suggest me some accurate method.
Thank You,
 

Each diode will have a slightly different forward voltage even if they have the same part number. The voltage depends on the current and on the temperature.
Here from the datasheet is the forward voltage of a typical 1N4148 diode at different currents and different temperatures. Each diode will be a little different.
 

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If i have an unknown diode in component library of Cadence spectre and want to calculate its forward voltage drop. I mean using simulations can we calculate accurate forward drop. Thanks
 

The simulation will do that for you: run a DC analysis with a current source instead of the resistor between VDD and the diode's anode (cathode to GND), sweep the current over the range you need, then plot the current vs. the diode's voltage (or vice versa).
 

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