spectreRF 各种分析的讲解（非帮助文件，ppt格式）.pdf

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CIC 1.SpectreRF Overview • SpectreRF is an optional feature added to Spectre ,and is represented by 6 analyses: 1.PSS: Periodic Steady State Analysis 2.PAC: Periodic AC Analysis 3.PXF: Periodic Transfer Function Analysis 4.PNOISE: Periodic Noise Analysis Tdnoise: Time Domain Noise QPNOISE: Quasi-Periodic Noise (not discuss here) 5.PDISTO: Periodic Distortion Analysis QPSS: Quasi-Periodic Steady State (not discuss here) 6.Envelope Analysis (not discuss here) PAC, PXF, and PNOISE are similar in concept to AC, XF, and Noise. However, they are applied to periodically-driven circuits such as mixers and oscillators. 1-1

CIC SpectreRF in a Design Flow Design Schematic Analog Artist Environment Models Netlist SPECTRE Engine SpectreRF Control The netlists include all components along with an analysis selection, simulation controls and statements to save, plot nodes or currents. Analog Artist Plot Results Use Direct plot or the Calculator plot capabilities. 1-2

CIC SpectreRF Tool Flow No PDISTO Setup SpectreRF Stimuli iscoperiodic Yes PSS setup Spectre Engine PDISTO Analysis Spectre Engine PSS Analysis PDISTO Results PSS Results SpectreEngine -PAC Analysis -PXF Analysis -PNOISE Analysis Report Results 1-3 PSS is a large-signal analysis and determines the period of the small-signal analyses. PSS requires that multiple periodic stimuli be coperiodic. PDISTO is also a large- signal analysis, and need not to be run after a PSS analysis. PDISTO does not require multiple periodic stimuli to be coperiodic.

CIC SpectreRF Features • Compute a steady-state solution efficiently and directly • Handles very large circuits (~ 10,000 transistors) • Displays results in both time and frequency domains • Use Discrete Fourier Transform (DFT) for better accuracy • Displays standard RF measurements, such as s-parameter in Smith chart, NF, IP3, and 1dB compression point in the Analog Artist design environment. • Performs oscillator analysis. 1-4

CIC 2.S-Parameter Analysis • Linear Simulation: – Entirely in the frequency domain – A basic RF feature of the Spectre simulator • Ports: – Specify the port number on the psin ( or port); psin (or port) can act as a source port or a load. – Required properties for linear analysis: Resistance & Port number • Noise Analysis: – UseNfminand NF for 2-port circuits ONLY. 2-1

CIC Plotting S-Parameter Simulation Results G min, G opt, or G on) SP, ZP, YP, HP s-, z-, y-, and h-parameters GD group delay VSWR Voltage Standing Wave Ratio NFmin minimum noise figure Gmin reflection coefficient associated withNfmin(also known as Rn noise sensitivity parameter rn normalized equiv. Noise resistance NF noise figure Kf& B1f stability terms GT transducer gain GA available gain, assuming conjugate matched output GP power gain, assuming conjugate matchedinput Gmax maximum available power gain Gmsg maximum stable power gain Gumx maximum unilateral power gain ZM impedance at port m NC noise circles GAC available gain circles GPC power gain circles LSB load stability circles SSB source stability circles 2-2

CIC Lab1 : S-parameter Analysis • Use library “analogLib” & “tsmc25rf” to draw the scheme. • Create a new library and a new schematic view. • After drawing, push Design ﬁ Checkand Save; then push Tools ﬁ Analog Environment, and the window “Affirma Analog Circuit Design Environment” will appear. create instance from library “tsmc25rf” 2-3

CIC Setup Design Environment(1) • Push Setup ﬁ Model Libraries then the window “Model Library Setup” appears. Setup the model library as shown right. Then click OK. • Push Setup ﬁ Simulator/Directory/Host to designate the project directory. The default project directory is “ ~/simulation “ . Use “Browse” to access to the model files 2-4

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spectreRF 各种分析的讲解（非帮助文件，ppt格式）.pdf

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