CT = 0.35 pF, Rs@100 mA = 2.5 ,  = 1800 nsec, fc = 88 kHz
applications: low current attenuators
available configurations
SPICE model
SPICE models are not available for HP PIN diodes as SPICE does not model carrier lifetime, a critical parameter for PIN diodes
APLAC Limited PIN Diode Model
The APLAC model predicts the RF resistance of a PIN diode chip under all bias conditions, and is based on the article
SPICE CIRCUIT YIELDS RECIPE FOR PIN DIODE, Joe Walston, Microwaves & RF - November 1992.
APLAC MODEL LIMITATIONS:
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- The model can be used to predict the r.f. resistance and forward voltage. It does not give predictions of distortion.
- A PIN diode only behaves reliably as a variable resistor at frequencies above 10fc, where fc = 1/2pt and t is the minority carrier lifetime.
- The capacitance of a PIN diode does vary with the reverse voltage applied however the APLAC model only allows a fixed value.
- APLAC uses carrier lifetime (t) as an approximation for transit time (TT).
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HSMP-380x Limited APLAC Model
D1 uses the standard SPICE diode model, and is described by Is, N, and TT. Rs in the standard model is replaced by the external network
of Rmin, Rmax, and Rvar. The parameters are for a single diode (HSMP-3800). Parameters also apply to the individual diodes within multiple
diode configurations.
| parameter | units | description | value |
| Rmax | ohm | maximum r.f. resistance | 10000 |
| Rmin | ohm | minimum r.f. resistance | 2 |
| K | - | resistance curve fitting exponent | 1.015 |
| A | - | resistance curve fitting constant | 0.0434 |
| L | nH | connection inductance | 2 |
| C | pF | diode capacitance at r.f. frequency | 0.3 |
| Is | A | diode saturation current | 3.5E-9 |
| N | - | diode ideality factor | 2.062 |
| TT | nsec | transit time (carrier lifetime) | 1800 |
Applications Literature
General Information
As Attenuators
Assembly Information
Reliability Information
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