Pin Diode Circuit Model

This article discusses the modelling of p n junction diodes but the techniques may be generalized to other solid state diodes. The initial pin diode model without spice as shown in the first model builder chart in figure 1 approximates a silicon chip that has a 10um by 10um footprint and a 7um thickness.

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The equivalent circuit of the intrinsic pin diode.

Pin diode circuit model. Rrr ccmin if reverse bias. Rri cdepletion capacitance if forward bias. The electrical model of the pin diode looks like an inductor in series with a resistor when forward biased.

Pin diode switching requirements figure 1shows a simplified schematic of a pin diode switch. When reverse biased it looks like an inductor in series with a paralleled capacitor and resistor figure 3. An advanced pin diode model based on a model developed by r caverly has been created and validated to significantly enhanced frequency and bias dependent junction capacitance.

A prototype of the protection circuit was built using pin diodes in a modified series shunt. In electronics diode modelling refers to the mathematical models used to approximate the actual behaviour of real diodes to enable calculations and circuit analysis. For designers using microsemi pin diodes a spice pin diode model of microsemis products line will allow microsemi and their customers to readily incorporate these models devices in their circuit designs.

Idc is the dc current through the pin diode when r is replaced by a dc voltage source with vi volt. Lecture 15 92601 diode spice model ideality factor accounts for generation recombination in the depletion region of the diode ignored in our derivation for id usual range for n is 05 1 rs is the series resistance of the quasineutral p and n regions plus the ohmic contacts. Typically the pin diode is used in rf through microwave fre quency modulators and switches.

A diodes i v curve is nonlinear. Pin diodes are used in this project as solid state switches in order to provide an alternate path for the current and isolate the sensitive sensor throughout the high voltage pulse. The overall spice pin diode model developed for the umx5601 exhibits the equivalent circuit shown below.

An accurate physics based model for power pin diodes is derived and implemented as a subcircuit into the pspice circuit simulator. If the i region forward bias voltage drop vi is not specified or equal to zero. The model is based on an equivalent circuit representation of the.

This nonlinearity complicates calculations in circuits involving diodes so simpler models are often required. The specific values of the passive elements in these models depend upon the pin diode model.

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