Computer-aided circuit analysis tools for RFIC simulation: Algorithms, features, and limitations

The design of the radio frequency (RF) section in a communication integrate d circuit (IC) is a challenging problem. Although several computer-aided an alysis tools are available for RFIC design, they are not effectively used, because there is a lack of understanding about their features and limitatio ns. These tools provide fast simulation of RFIC's, However, no single tool delivers a complete solution for RFIC design. This paper describes the shor tcomings of conventional SPICE-like simulators and the analyses required fo r RF applications with an emphasis on accurate and efficient simulation of distortion and noise. Various analysis methods, such as harmonic balance, s hooting method, mixed frequency-time methods, and envelope methods, that ar e currently available for RFIC simulation are presented. Commercial simulat ors are compared in terms of their functionalities and limitations. The key algorithmic features and the simulator-specific terminology are described.