aLittleKnowledge wrote on Jul 13^th, 2010, 4:38am:
What do you want to mean ?

Whether a discrete time change in synthesizer is acceptable or not is dependent on system requirements such as required channel change time.

See http://www.designers-guide.org/Forum/YaBB.pl?num=1277523905/3#3

Actually DTCXO(Digitally controlled TCXO) is extensively used in cellular phone system.