A Top - down Synthesis Methodology Forbehavioral Mixed - Signal Systems Specified

This paper presents a top-down design methodology to synthesize mixed-signal systems described at be-havioral level. Our methodology is intended to automate the synthesis process of analog CMOS integrated circuits. Also, the method enables the circuit description at high level of abstraction where complex systems are easier to specify. The behavioral models are represented by a set of simultaneous diierential and algebraic equations (DAEs), which are written in VHDL-AMS using simple simultaneous and procedural statements. We present an algorithm to perform the topology selection process. As an example, a Dual-Tone Multiple-Frequency decoder is synthesized from behavioral model to analog CMOS transistor level.