I had the same opinion about this (that vhdl is only for digital circuits) but then i saw a paper which use VHDL-ams to implement analogue circuit.I need resources about this subject
You should be little more specific as to what do you want to implement.... Some of the telecom designs (partially) may be purely digital and you may use VHDL, but majority of them deals with Mixed Signals and VHDL-AMS is the best option to go for.