Sonnet User's Guide - Sonnet Software

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Sonnet User’s Guide project editor or Output ⇒ PI Model File in the response viewer). The PI model is only applicable for a narrow band. The model that is output is usually one which is intuitive and easily understood by a user as shown below. Z a Z b Z c may be used for any number of ports. This figure shows a 2-port model, but the PI model The second output is an N-coupled line (Multiple Transmission Line) model. Sonnet creates this model when you specify an N-Coupled Line Model output file in the Spectre format (Analysis ⇒ Output Files in the project editor or Output ⇒ N- Coupled Line Model in the response viewer). This model produces a RLGC matrix which can be used in Cadence Virtuoso Spectre. The equivalent circuit is shown below for four lossless transmission lines. 310
Chapter 21 SPICE Model Synthesis A third way to bridge the gap between the frequency domain and the time domain is to fit the frequency domain data with a rational polynomial. Sonnet's Broadband Spice Extractor feature uses this method to provide a circuit model which is valid over a broad band. This model, unlike the lumped element model described above, does not yield an intuitive understanding of a design. Instead, the Broadband Spice Extractor feature generates a model that can be used in Spice as a “black box” representing the broad band behavior of your circuit as shown below. This type of model will be referred to as the Broadband Spice model. filter.olb This chapter describes how to use Sonnet to automatically synthesize PI Model, N-Coupled Line Model and Broadband Spice Model files. The PI capability is useful for circuits which are small with respect to the wavelength at the highest frequency of interest. This includes structures such as discontinuities like step, tee and cross junctions. Other applications include modeling cross-talk and propagation delay in digital interconnect circuits and multiple spectrum circuits that combine digital, analog and RF functions. The Broadband Spice model is fitted over a wide frequency band and can be used in circuit simulators for AC sweeps and transient simulations. NOTE: Broadband Spice Extractor is only available if you have purchased a license from Sonnet which includes the Broadband Spice Extractor feature. Please see your system administrator if you are unsure of the availability of this option. PI Spice Model Specifying an optional PI Model Spice output file automatically takes the results of the electromagnetic analysis of a circuit and synthesizes a model using inductors, capacitors, resistors and mutual inductors. This information is then formatted and saved in one of two SPICE formats: PSpice or Spectre. 311
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