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Mitsubishi RD06HHF1/RD06HVF1 LDMOS model
Under construction...
The Mitsubishi RD06HHF1 is a medium power LDMOS (6 W) for the HF bands, which is often used as a driver for a couple of its bigger brother RD16HHF1 or also standalone for a QRP-level output power.
A very similar, if not identical, device is the RD06HVF1: this latter is specified in the datasheet up to 175 MHz (instead of 30 MHz only) but its electrical characteristics are otherwise identical to the RD06HHF1 and also the provided S-parameters are the identical, so the model shown here should be representative of both devices.
Model for Vdd=12.5 V and Idd= 500 mA
Typical S-parameters for this device can be found on the Mitsubishi web site, for a supply voltage of 12.5 V and a drain current of 500 mA.
Using the extraction method previously described, considering only the S-parameters from 50 MHz to 500 MHz, the following small-signal model parameters are determined:
Rg = 1.88 ohm Rd = 1.60 ohm Rs = 0.263 ohm Lg = 3.01 nH Ld = 2.73 nH Ls = 0.835 nH Cgs = 24.2 pF Cds = 16.5 pF Cgd = 1.35 pF gm = 0.433 S gds = 1.11 mSSo the equivalent small-signal circuit for this LDMOS at 500 mA drain current is the following:
Smith chart with measured vs. model S-parameters:
S-parameters fitting details - fitted region is in white background:
