射频功率放大器cadence仿真指导workshop

【实例简介】
CMOS PA在cadence下的仿真workshop，hb 仿真Pout PAE，envelp的EVM ，ACPR等等
PA Design USing SpectreRF Power Amplifier design Using SpectreRF Purpose This workshop describes how to use SpectreRF, which includes the new hb analysis, in the virtuoso Analog design Environment to measure parameters that are important in design verification of Power Amplifiers(PAs) The hb analysis is one new Gui for the harmonic balance analysis, and has the similar features with the harmonic balance engine in Pss and QPss analyses Note: The procedures described in this workshop have been kept broad and gencric. Your specific design might require procedures that are slightly different from those described here Audience Users of Spectrerf in the virtuoso Analog design Environment Overview This workshop describes a basic set of the most useful measurements for Pas Introduction to Power Amplifiers Power amplifiers are a part of the transmitter front-end used to amplify the transmitted signal so the signal can be received and decoded within a fixed geographical area. The main Pa performance parameter is the output power level the PA can achieve, dependin on the targeted application, linearity, and efficiency Power amplifiers can be categorized several ways depending on whether they are broadband or narrow band, and whether they are intended for linear operation(Class A, B AB and C)or constant-envelope operation( Class D, e and F). This workshop focuses on the design of narrowband and linear pas August 2010 ProductⅤ ersion10.1 PA Design Using SpectreRF The Design Example The Pa measurements described in this workshop are calculated using SpectreRF in the Virtuoso Analog design Environment. The design cxample used to conduct the measurements described in this workshop is the two-Stage power amplifier, EF_PA_isto and EF_PA_ostg, shown below Input Device level models 」 Inp D■■■ RFIN REOUT RF○ PA。stg utput The supply voltage is 5 V. There is a simple output matching network in the sub circuit EF_PA_Ostg. The power amplifier is designed to be driven by Cdma l/Q channel baseband signals, modulated using Qpsk schemes with a carrier frcqucncy of 1 ghz Typical Pa performance metrics are listed in the following table Measurement Acceptable value Output power +20 to +30 dBm Efficiency 30%to60% Supply voltage 2.8to58V G 20 to 30 dB Harmonic Output(2f, 3f, 4f) 30 to -50 dBc Stability factor > Three Testbenches for Pa measurements Testbench one The first testbench drives the pa by sinusoidal sources. In this workshop you use this testbench to make general measurements, including Power related measurements(input power, output power, supply voltage, supply current, power gain, and power dissipation) August 2010 ProductⅤ ersion10.1 PA Design Using SpectreRF Efficiency measurements(drain efficiency and power added efficiency) Linearity measurements(1 dB compression point, IIP3, and OIP3 Noise measurements(NF or F) Stability measurements(K-factors, Blf, and s-parameter) Large signal s-Parameter measurements You use a Periodic steady State(Pss)or hb analysis followed by a Periodic small Signal (PAC/PSP/PNOISE, or hbac/hbnoise)analyses to make these measurements (For details see labs 1 to 4 on pages 6-44) Testbench two The second testbench drives the Pa by a sinusoidal source with a port adapter added at the output power amplifier. You use this testbench to generate Load-pull contours Reflection contours You use the swept hb analysis combined with the parametric analysis tools to measure load pull. (For details, see Lab 5 on page 52) Testbench three The third testbench drives the pa by modulation signals. You use this testbench to generat ACPR plot Input and output trajectory plots You use the envelope (envlp) analysis to make these measurements ( For details, see Lab 6 on pagc 75) August 2010 ProductⅤ ersion10.1 PA Design Using SpectreRF Example Measurements Using SpectreRF To achieve optimal circuit performance, you should measure and evaluate several PA characteristics or parameters under varying conditions. The most important trade-off in Pa design is between efficiency and linearity Begin the examination of the flow by bringing up the Cadence Design Framework II environment to look at a full view of the reference design Action P-1: cd to rfworkshop directory Action p-2: Run tool virtuoso Action P-3: In the ciw window, choose Tools- Library manager. Lab l: Power Related Measurement(Swept hb) Power related measurements include input power, output power, supply voltage, supply current, power gain, and power dissipation. To make these measurements, you use a swept PSs analysis to sweep the input power level Action 1-1: Open the schematic view of the design ef example simple in the library RFworkshop noLt Device level Models RFCU厂 Action 1-2: Select the PORTI source. Choose edit- Properties-Objects and ensure that the port properties are set as described below Parameter Value Resistance 50 ohm Port number DC voltage (blank August 2010 ProductⅤ ersion10.1 PA Design USing SpectreRF Sourcc typc ne SIr Frequency name 1 RE FI n Amplitude l(dBm) pin Action 1-3: Select the PORT2 source. Choose Edit- Properties-Objects and ensure that the port properties are set as described below Parameter Value Resistance 50 oh Port number DCⅴ oltage (blank Source typ dc Action 1-4: Check and save the schematic Action 1-5: In the virtuoso Schematic Editing window, choose Launch - L Action 1-6: (Optional) Choose Session- Load State in the virtuoso analog desig Environment window, select Cellview in Load State Option and loar n state"Lab1 Power hb, then skip to action 1-12 Action 1-7: In the virtuoso Analog design Environment window, choose Analyses Choose Action 1-8: In the Choosing analyses window, select hb in the analysis field of the window. Set up the form as follows August 2010 7 ProductⅤ ersion10.1 PA Design USing SpectreRF Choosing Analyses -Virtuoso Analog Design Environmen x 1 R fin 10 PORT1 上1n 1 PORT1 rarde Delete Update From Hierarch Freqdivide ratio for tone with Tsta.b Harmonic Default t Multi-rate harmonic balance Accuracy Defaults (errpreset conservative v moderate liberal Convergence Additional Time for Transient-Aided HB (tstaby Save Initial Transient Resuits (saveinit) L no _ ye Harmonic Balance Homotopy Method Oscillat Frequency variable?·n0 riable able name包r Select Design variable Sweer rar e Start-Stop Center-span Sweep Type ●Lin巳a Step si V LogarithmIc Number of Step: Add specifIc Points L New Initial value For Each Point (restart L no L yes Loadpull Enabled Option August 2010 ProductⅤ ersion10.1 PA Design Using SpectreRF similar features with the harmonic balance engine in Pss and QPSS analyses nd has the Note: The hb analysis is one new GUI for the harmonic balance analysis For the hams/maxharms parameter, 5-8 is enough usually More harms/maxharms will be used for the strong non-linear signal By default, the tstab method is used for Harmonic Balance Homotopy Method Action 1-9: Make sure that Enabled is sclccted. Click OK in the Choosing Analyses orm Action 1-10: In the Virtuoso Analog Design Environment window, choose Outputs- To be saved- Select on Schematic Action 1-11: In the schematic, select the positive terminals of PORT2, and pOrT1 Press the esc key to end the selection process The virtuoso Analog design Environment window looks like this Virtuoso Analog Design Environment (7)-RFworkshop EF example simple schematic-B Session Setup Analyses varlables outputs sImulatIon Results Tools Help cadence ‖sat$· RPAr T ulat PCTTP itateI ah1 Pnwer h Design variables nalyses RF5-600 tIn T touts l ame/Signa./Expr value Plot Save Save options PORTI/PLUS PORT2/PLUS Plot after simulatio plotting mode: Replac 30 Netlist and Ru1 Action 1-12. Choose simulation Netlist and run to start the simulation or click the netlist and Run icon in the virtuoso Analog design Environment window. After the simulation finishes, use the next actions to plot the Simulation results August 2010 ProductⅤ ersion10.1 PA Design Using SpectreRF Action 1-13: In the Virtuoso Analog design Environment window, choose Results Direct plot- Main form The Direct Plot form appears Action 1-14: In the Direct Plot Form window, choose hb as the analysis type. Choose Power in the Function field. Choose IG in the Output Harmonic list box August 2010 ProductⅤ ersion10.1 【实例截图】
【核心代码】