LDMOS gate source is Low voltage ..
and need high-side Nmos , source-bulk have high breakdown .
VIS (vanguard )have 40v mos
vgs = 40v
vds=40v
use "sym_nmos "
asy_nmos source to Bulk还是低压
by the way , how can provide some paper about analog switch ?
usb have high speed switch
Digitally controlled high-voltage analog switch array for medical ultrasound applications in thin-layer silicon-on-insulator process
Integrated analog switch matrix with large input signal and 46 dB isolation at 1 GHz Low-resistance wide-voltage-range analog switch for implantable neural stimulators