IN3LBQ on the Hühnerspiel (Amthorspitze) - photo by IN3OTD

The 1N5408 as PIN diode

1N5408 measurement setup

Small-signal loss vs bias

S-parameters measured at -20 dBm

Forward biased

Diode forward biased with currents from 1 mA to 100 mA.

1N5408 loss vs bias current

Reverse biased

Diode reverse biased with voltages from 0 V to 20 V.

1N5408 isolation vs bias voltage

Harmonics level vs power

At 1.8 MHz

1N5408 fundamental at 1.8 MHz 1N5408 H2 at 1.8 MHz 1N5408 H3 at 1.8 MHz 1N5408 H4 at 1.8 MHz 1N5408 H5 at 1.8 MHz

Intermodulation distortion vs power

At 1.8 MHz

1N5408 IM3 at 1.8 MHz 1N5408 IM5 at 1.8 MHz 1N5408 IM7 at 1.8 MHz