I. INTRODUCTION
With the advance in semiconductor technologies and the
rapid growth of the markets for computer, communication, and
consumer electronics, more and more analog and mixed-signal
circuits are integrated with digital units to realize system-on-a
chip (SoC). Since analog design needs comprehensive analysis
and complicated trade-off among various aspects of
performances, it requires a lot of development time to achieve
functional analog blocks when implementing a SoC.
Especially in modem process technologies, numerous high
order non-idealities should be taken into account, which
further complicates the analysis and design processes. The
difficulties in analog design and the lack of support by design
automation tools, analog circuits continually become
bottleneck in the chip design flow [I]. How to shorten
development time of analog circuits, and consequently shorten
the time to market, is a pressing subject to designers.