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Freescale AFT09MS015N LDMOS model
Under construction...
The Freescale AFT09MS015N is a low power LDMOS.
Model for Vdd=12.5 V and Idd= 400 mA
Typical S-parameters for this device can be found on the NXP/Freescale web site, for a supply voltage of 12.5 V and a drain current of 400 mA.
Using the extraction method previously described, considering only the S-parameters from 240 MHz to 1 GHz, the following small-signal model parameters are determined:
Rg = 0.18 ohm Rd = 0.0 ohm Rs = 0.002 ohm Lg = 0.39 nH Ld = 0.47 nH Ls = 0.014 nH Cgs = 70.7 pF Cds = 30.6 pF Cgd = 1.1 pF gm = 1.65 S gds = 2.1 mSSo the equivalent small-signal circuit for this LDMOS at 400 mA drain current is the following:
Smith chart with measured vs. model S-parameters:
S-parameters fitting details - fitted region is in white background:
