saber仿真软件tdsa模块使用说明.pdf

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tdsa (MX-Scan)

Functional Description

Template Description Sections

tdsa Connection Points

tdsa Symbol Properties

tdsa Post Processing Information

tdsa Model Description

tdsa Usage Notes

tdsa (MX-Scan) tdsa Associated Symbols: tdsa License Requirements: MODEL_SYNTHESIS Part Category: Related Topics: Analog Model Synthesis Templates Analog Model Synthesis Overview Functional Description The tdsa template uses sine wave stimulus techniques to obtain phase and gain information for a large-signal circuit. You connect the output as a source for the design under test, and the input to the output of the design. When you run a transient analysis, tdsa simulates the design, measures its output, and calculates phase and gain information, which it stores in a plot file. It also offers an optional bandpass input filter, and includes a source for a standard AC analysis. Template Description Sections Connection Points Symbol Properties Post-Processing Information Model Description Usage Notes Example Generic Template Library Copyright © 1992-2007 Synopsys Inc. 1

tdsa Connection Points Name outp outm inp inm Type electrical Description positive output of sinusoidal source electrical negative output of sinusoidal source electrical positive input for measurements electrical negative input for measurements enbl logic_4 enable input for frequency sweep MX Scan (tdsa) 2 Generic Template Library Copyright © 1992-2007 Synopsys Inc.

tdsa Symbol Properties tdsa Property primitive Description: This symbol calls the template tdsa. The template will create an AC or complex plot file for the circuit under test during a transient analysis. This is not meant to replace the standard AC analysis, but to allow AC results to be obtained for circuits that will not work with the standard AC analysis. An example is switching circuits. WARNING! Since a template and not the simulator creates the plot file, analyses with looping (such as vary and mc) will not function as expected. Only the AC data obtained from the last loop will be in the plot file created by the tdsa template. ref Description: Suffix appended to a template name that uniquely identifies a part in a schematic. Default: Example Input: If not specified will be assigned by Schematic Capture Tool Can be any alpha-numeric string Generic Template Library Copyright © 1992-2007 Synopsys Inc. 3

Property fbegin Description: Starting frequency value for the frequency sweep. A value is required and it must be > 0. Default (units): Example Input: value required (Hz) 100 fend Description: Ending frequency value for the frequency sweep. A value is required and it must be > 0. Default (units): Example Input: value required (Hz) 10k pfile Description: Name of the plot file created by Default (units): Example Input: tdsa template. File identifier (suffix) identifying AC plot file showing the frequency response determined by tdsa. ac_tdsa Can be any alpha-numeric string in quotes. ac_1 Plot file generated: design.ac_1 Generic Template Library Copyright © 1992-2007 Synopsys Inc. 4

tdsa Property ampl Description: Peak amplitude of output sine wave relative to DC offset. Default (units): Example Input: 100m (V) 200m offset Description: Offset voltage of the output waveform. Default (units): Example Input: 0 (V) 2 npoints Description: Number of frequency steps to take during the frequency sweep from fbegin to fend. Must be an integer > 0. Default (units): Example Input: 100 (—) 200 Generic Template Library Copyright © 1992-2007 Synopsys Inc. 5

Property mode Description: Type of frequency sweep to be Default (units): Values: performed. logswp (—) linswpLinear spacing of frequency points. All points are equally spaced from fbegin to fend. logswpLog base 10 spacing of frequency points. All points are equally spaced on a log scale. rlogswp1-log base 10 spacing of frequency points. Distribution of points is weighted toward fend on a log scale. Example Input: logswp 6 Generic Template Library Copyright © 1992-2007 Synopsys Inc.

Property max_err Description: Maximum error allowed for tdsa writing data to the plot file and going to the next frequency point in the sweep. Error is calculated for gain and phase and both must be less then max_err to continue on to next frequency point. Must be > 0. Default (units): Example Input: 0.01 (—) 0.005 max_nper Description: Maximum number of periods allowed before switching to the next frequency point, even if the error is larger then max_err. Data gets written to the plot file and a warning is sent to the screen. Must be an integer >= 3. Default (units): Example Input: 30 (—) 40 Generic Template Library Copyright © 1992-2007 Synopsys Inc. 7

Property min_nper Description: Minimum number of periods required before switching to the next frequency even if the error is less than max_err. Must be integer >= 3 and < max_nper. Default (units): Example Input: 3 (—) 4 min_tspp Description: Minimum number of time steps taken during a period. For circuits with very little switching you need to insure a reasonable number of time steps are taken per period. Must be >= 20. This affects the accuracy of the phase information obtained. A larger number increases the accuracy but can slow down the simulation. Default (units): Example Input: 40 (—) 35 8 Generic Template Library Copyright © 1992-2007 Synopsys Inc.

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