hspice book hspice ch02 1 Thu Jul 23 19 10 43 1998 Chapter 2 Getting Started The examples in this chapter show you how to run Star Hspice to perform some simple analyses This chapter includes the following examples AC Analysis of an RC Network Transient Analysis of an RC Network Transient Analysis of an Inverter Star Hspice Manual Release 1998 2 2 1 hspice book hspice ch02 2 Thu Jul 23 19 10 43 1998 AC Analysis of an RC Network Getting Started AC Analysis of an RC Network Figure 2 1 shows a simple RC network with a DC and AC source applied The circuit consists of two resistors R1 and R2 capacitor C1 and the source V1 Node 1 is the connection between the source positive terminal and R1 Node 2 is where R1 R2 and C1 are connected Star Hspice ground is always node 0 1 R1 1k V1 10 VDC 1 VAC 2 R2 1k C1 0 001 F 0 Figure 2 1 RC Network Circuit The Star Hspice netlist for the RC network circuit is A SIMPLE AC RUN OPTIONS LIST NODE POST OP AC DEC 10 1K 1MEG PRINT AC V 1 V 2 I R2 I C1 V1 1 0 10 AC 1 R1 1 2 1K R2 2 0 1K C1 2 0 001U END Follow the procedure below to perform an AC analysis for the RC network circuit 2 2 Star Hspice Manual Release 1998 2 hspice book hspice ch02 3 Thu Jul 23 19 10 43 1998 Getting Started AC Analysis of an RC Network 1 Type the above netlist into a file named quickAC sp 2 Run a Star Hspice analysis by typing hspice quickAC sp quickAC lis When the run finishes Star Hspice displays info hspice job concluded followed by a line that shows the amount of real time user time and system time needed for the analysis The following new files are present in your run directory quickAC ac0 quickAC ic quickAC lis quickAC st0 3 Use an editor to view the lis and st0 files to examine the simulation results and status 4 Run AvanWaves and open the sp file Select the quickAC ac0 file from the Results Browser window to view the waveform Display the voltage at node 2 using a log scale on the x axis Figure 2 2 shows the waveform that was produced by sweeping the response of node 2 as the frequency of the input was varied from 1 kHz to 1 MHz Star Hspice Manual Release 1998 2 2 3 hspice book hspice ch02 4 Thu Jul 23 19 10 43 1998 AC Analysis of an RC Network Getting Started Figure 2 2 RC Network Node 2 Frequency Response The file quickAC lis displays the input netlist details about the elements and topology operating point information and the table of requested data as the input is swept from 1 kHz to 1 MHz The files quickAC ic and quickAC st0 contain information about the DC operating point conditions and the Star Hspice run status respectively The operating point conditions can be used for subsequent simulation runs using the LOAD statement 2 4 Star Hspice Manual Release 1998 2 hspice book hspice ch02 5 Thu Jul 23 19 10 43 1998 Getting Started Transient Analysis of an RC Network Transient Analysis of an RC Network As a second example run a transient analysis using the same RC network as in Figure 2 1 but adding a pulse source to the DC and AC sources 1 Type the following equivalent Star Hspice netlist into a file named quickTRAN sp A SIMPLE TRANSIENT RUN OPTIONS LIST NODE POST OP TRAN 10N 2U PRINT TRAN V 1 V 2 I R2 I C1 V1 1 0 10 AC 1 PULSE 0 5 10N 20N 20N 500N 2U R1 1 2 1K R2 2 0 1K C1 2 0 001U END Note that the V1 source specification has added a pulse source The syntax for pulsbe sources and other types of sources is described in Chapter 5 Using Sources and Stimuli 2 Type the following to run Star Hspice hspice quickTRAN sp quickTRAN lis 3 Use an editor to view the lis and st0 files to examine the simulation results and status 4 Run AvanWaves and open the sp file Select the quickTRAN tr0 file from the Results Browser window to view the waveform Display the voltage at nodes 1 and 2 on the x axis The waveforms are shown in Figure 2 3 ob Star Hspice Manual Release 1998 2 2 5 hspice book hspice ch02 6 Thu Jul 23 19 10 43 1998 Transient Analysis of an RC Network Getting Started Figure 2 3 Voltages at RC Network Circuit Node 1 and Node 2 2 6 Star Hspice Manual Release 1998 2 hspice book hspice ch02 7 Thu Jul 23 19 10 43 1998 Getting Started Transient Analysis of an Inverter Transient Analysis of an Inverter As a final example analyze the behavior of the simple MOS inverter shown in Figure 2 4 VCC VCC M1 OUT IN VIN CLOAD 0 75 pF M2 Figure 2 4 MOS Inverter Circuit 1 Type the following netlist data into a file named quickINV sp Inverter Circuit OPTIONS LIST NODE POST TRAN 200P 20N PRINT TRAN V IN V OUT M1 OUT IN VCC VCC PCH L 1U W 20U M2 OUT IN 0 0 NCH L 1U W 20U VCC VCC 0 5 VIN IN 0 0 PULSE 2 4 8 2N 1N 1N 5N 20N CLOAD OUT 0 75P MODEL PCH PMOS LEVEL 1 MODEL NCH NMOS LEVEL 1 END 2 Type the following to run Star Hspice hspice quickINV sp quickINV lis Star Hspice Manual Release 1998 2 2 7 hspice book hspice ch02 8 Thu Jul 23 19 10 43 1998 Transient Analysis of an Inverter Getting Started Use AvanWaves to examine the voltage waveforms at the inverter IN and OUT nodes The waveforms are shown in Figure 2 5 Input Output Figure 2 5 Voltage at MOS Inverter Node 1 and Node 2 2 8 Star Hspice Manual Release 1998 2