Satoshi Tanaka Evolutional Trend of Mixed Analog and Digital RF Circuits. 757-768 2009 92-C IEICE Transactions 6 http://search.ieice.org/bin/summary.php?id=e92-c_6_757&category=C&year=2009&lang=E&abst= db/journals/ieicet/ieicet92c.html#Tanaka09