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Slide 1

... The maximum reverse voltage that won’t take a diode into the zener region is called the peak inverse voltage or peak reverse voltage. The voltage that causes a diode to enter the zener region of operation is called the zener voltage (VZ). ...
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... disadvantage in applications that require shortcircuit capabilities. While short-circuit capabilities require the channel density to be reduced, simply expanding the gap between trenches has an impact on the withstand voltage. Given this, PCM technology fills in the trench gates for one out of every ...
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Current mirror

A current mirror is a circuit designed to copy a current through one active device by controlling the current in another active device of a circuit, keeping the output current constant regardless of loading. The current being 'copied' can be, and sometimes is, a varying signal current. Conceptually, an ideal current mirror is simply an ideal inverting current amplifier that reverses the current direction as well or it is a current-controlled current source (CCCS). The current mirror is used to provide bias currents and active loads to circuits. It can also be used to model a more realistic current source (since ideal current sources don't exist).The circuit topology covered here is one that appears in many monolithic ICs. It is a Widlar mirror without an emitter degeneration resistor in the follower (output) transistor. This topology can only be done in an IC as the matching has to be extremely close and cannot be achieved with discretes.Another topology is the Wilson mirror. The Wilson mirror solves the Early effect voltage problem in his design.
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