Diode clipping Vbias replacement
Consider the use of a zener diode instead. It is placed in the opposite orientation without a bias voltage source, to clamp the output voltage to some limit. In order to prevent a secondary clipping to ground, a second non-Zener diode is used as well:







simulate this circuit &ndash; Schematic created using CircuitLab



This behavior arises as a consequence of the zener diode's VI characteristic (reproduced from here):



Notice the green zener region in the bottom left. There are three regions to consider:


Input voltage &lt; 0: D2 is reverse biased, so the output is unchanged.
Input voltage between 0 and Vz + 0.7 V: There is not enough voltage to forward bias D2 and allow D1 to conduct.
Input voltage above Vz + 0.7 V: The input voltage is large enough that D1 and D2 can conduct a large amount of current. Because that current must flow through the resistor, the output voltage is clamped to Vz + 0.7 V.


In order to make the clamping voltage 5 V, you'll need a 4.3 V zener.