Diodes

The Tuner diode and Schottky Diode ranges use a standard Spice diode model and a typical file appears as follows:

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*Zetex ZC830A Spice Model v1.0 Last Revised 4/3/92
*
.MODEL ZC830A D IS=5.355E-15 N=1.08 RS=0.1161 XTI=3
+ EG=1.11 CJO=19.15E-12 M=0.9001 VJ=2.164 FC=0.5
+ BV=45.1 IBV=51.74E-3 TT=129.8E-9
+ ISR=1.043E-12 NR=2.01
*
*NOTES: FOR RF OPERATION ADD PACKAGE INDUCTANCE 0F 2.5E-9H AND SET
*RS=0.68 FOR 2V, 0.60 FOR 5V, 0.52 FOR 10V OR 0.46 FOR 20V BIAS.
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*$
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In the diode model:

• IS controls forward and reverse current against voltage.
• N controls forward current against voltage.
• RS controls forward voltage at high current.
• CJO, M and VJ control variation of capacitance with voltage.
• BV and IBV control reverse breakdown characteristics.
• TT controls switching reverse recovery characteristics.
• ISR and NR control reverse biased leakage.
• EG controls barrier height.
• FC forward bias depletion capacitance coefficient.

For operation at RF (which would be the norm for a varicap or tuner diode) it is recommended that a 2.5nH series inductor be added as an extra circuit element to correct for the inherent package inductance, this value will change with package size. Also, for some models data is available to enable the RS parameter better model Q at voltages other than the specified condition.

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