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Chapter 14<br />

Working with S, Y, Z Parameters<br />

A set of commands in Eldo enables you to extract large signal S parameters (Scattering),<br />

Y parameters (Admittance) or Z parameters (Impedance) in the frequency domain for a<br />

specified circuit. The circuit can have any number of ports.<br />

Eldo enables the simulation of circuits including any number of N-port blocks described by a<br />

frequency tabulation of their S, Y, or Z parameters. It does so by reading the S, Y, Z,<br />

G (Hybrid-G), H (Hybrid-H), T (Transfer scattering), or A (chain or ABCD) parameter data<br />

from a Touchstone® or CITIfile format file.<br />

Simulation Setup for S, Y, Z Parameter Extraction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 684<br />

S, Y, Z Parameter Extraction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 685<br />

Matrix (G, H, T, A) Parameter Extraction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 687<br />

Output File Specification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 688<br />

Simulating a Block Defined by S Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 691<br />

Transient Simulation of Circuits Characterized in the Frequency Domain . . . . . . . . . . . . 691<br />

Technical Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 692<br />

Implementation Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 695<br />

Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 696<br />

Basic Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 697<br />

Detailed Functionality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 697<br />

Instantiating a Block Defined by S, Y, Z Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 699<br />

Touchstone Data File Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 705<br />

CITIfile Data File Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 708<br />

Instantiating a Block Defined by X-Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 710<br />

Eldo® User's Manual, 15.3 683

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