IN3OTD's web site
...under perpetual construction.
Freescale AFT05MS031N LDMOS model
Under construction...
The Freescale AFT05MS031N is a low power LDMOS.
Model for Vdd=13.6 V and Idd= 500 mA
Typical S-parameters for this device can be found on the NXP/Freescale web site, for a supply voltage of 13.6 V and a drain current of 500 mA.
Using the extraction method previously described, considering only the S-parameters from 200 MHz to 500 MHz, the following small-signal model parameters are determined:
Rg = 0.58 ohm Rd = 0.22 ohm Rs = 0.01 ohm Lg = 0.4 nH Ld = 0.24 nH Ls = 0.014 nH Cgs = 98.3 pF Cds = 46.2 pF Cgd = 1.6 pF gm = 2.26 S gds = 1.6 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:
