A SIMPLE ZENER DIODE VOLTAGE REGULATOR1

Voltage Regulation using Zener Diodes

In digital or mixed-signal applications, there is a need to precisely regulate the voltage entering or exiting a circuit. The Zener diode has a unique property that offers a simple, low-cost solution to this problem. This application note discusses the implementation of this voltage regulator and its advantages and drawbacks.

Large magnetoresistance in a ferromagnetic GaMnAs/GaAs Zener diode

–We investigate spin-dependent interband tunnelling in a ferromagnetic (Ga,Mn)As/ GaAs Zener diode. The ferromagnetic pn-junction is fabricated with a Mn-doped p-type GaAs layer on top of a nonmagnetic n-type GaAs substrate. When both sides of the junction are heavily doped, a large magnetic-field–dependent tunnelling effect can be seen at low temperatures in the measured current-voltage (I-V )...

Voltage-controlled tunneling anisotropic magneto-resistance of a ferromagnetic p ++-(Ga,Mn)As/n +-GaAs Zener-Esaki diode

A simple extended-cavity diode laser

Operating a laser diode in an extended cavity which provides frequency-selective feedback is a very effective method of reducing the laser’s linewidth and improving its tunability. We have developed an extremely simple laser of this type, built from inexpensive commercial components with only a few minor modifications. A 780 nm laser built to this design has an output power of 80 mW, a linewidt...

A Simple Diode Model including Conductivity Modulationjf

A simple lumped component diode model is presented including a representation of conductivity modulation, in addition to the usual characterization by diffusion capacitance, transition capacitance, and an ideal junction. It is shown that this model employed in a switching circuit exhibits the overshoot and oscillation characteristic of diodes at high forward currents, as well as the usual charg...