Hello, the is the Diode model shown below.
Its revered biased voltage simulated below where port 1 is anode and 2 is cathode.Ltspice file and symbol is attached.
I want to build a circuit which inputs 0-3.3V square wave but the output is shifted by some voltage value.
I have a circuit show below which is doing the level shifting.
Its shifting the pulse exactly by the reverse voltage of the zenner diode.
Is there some analog design KCL KVL mathematical llogc i could see why exactly the Zenner diode is the only factor for the shifting?
LTspice file is attached.
Thanks.

https://eu.mouser.com/ProductDetail/Diodes-Incorporated/BZT52C3V6-7-F?qs=We1mx2pNWM9dxcfB67aIQA==

 

Hello, the is the Diode model shown below.
Its revered biased voltage simulated below where port 1 is anode and 2 is cathode.Ltspice file and symbol is attached.
I want to build a circuit which inputs 0-3.3V square wave but the output is shifted by some voltage value.
I have a circuit show below which is doing the level shifting.
Its shifting the pulse exactly by the reverse voltage of the zenner diode.
Is there some analog design KCL KVL mathematical llogc i could see why exactly the Zenner diode is the only factor for the shifting?
LTspice file is attached.
Thanks.

https://eu.mouser.com/ProductDetail/Diodes-Incorporated/BZT52C3V6-7-F?qs=We1mx2pNWM9dxcfB67aIQA==
View attachment 324026

View attachment 324029
View attachment 324030

Hi,

The simplest model for a zener diode is a voltage source when forward biased, and an open circuit with reverse bias.
Some zeners have a reverse diode structure so that when reverse biased they act like a regular Si diode but in the opposite direction.

You first solve for whether or not the zener is forward or reverse biased, then replace it with either of the above to finish the analysis. If the input is changing, you may have to do this several times to get the entire output waveform.

This simplifies the math to a great extent.

 

The mathematical role of the zener diode is related to the width of the depletion region by increasing the doping for a specific voltage potential effect. The amplified zener now nearly forgotten as the cost of positive and negative series regulators became available.
The zener as a voltage reference was replaced with newer references that have much higher accuracy, thermal properties, low noise.
The meaning of the term voltage shifting with zeners is sort of low current, it is almost novelty compared to how voltage shifting is accomplished today. The amplified zener, the zener diode being a reference voltage and the transistor giving current gain.