Abstract
This paper describes resent technology trend of mixed analog digital RF circuits. With progress of CMOS technology, large-scale digital signal processing and control function can be integrated in RF integrated circuit and some analog signal process blocks can be translated to digital signal processing units. In the same time, the design of remaining analog functional blocks becomes very hard.. The evolution of RF circuit technique in these 20 year is reviewed and some tradeoff between conventional analog circuit and digital RF circuit is discussed..
