4F.Carrez. Noval low-cost, low-power moduator/demoduator using a single GaAs field effect transistor. IEE Proc Circuits Devices Syst, 1998 ; 145(3) : 165-169.
5Thomas Olsson, Peter Nilsson. Digitally controlled PLL for digital SOCs. Proceedings of the International Symposium on Circuits and Systems, 2003 ; 5 ( 3 ) : 437-440.