However, this site has posted a lot of detailed explanations on how to use LTspice IV, settings, circuit diagram creation, and simulation. Since LTspice II is freeware, we cannot receive support such as lectures on how to use it. This completes the download and installation method of LTspice XVII. You should have a shortcut icon on your PC desktop. Automatic startup and shortcut icon generation for LTspice XVIIįinally, LTspice XVII starts up. Since LTspice XVII starts up automatically, wait for a while if there is the above display. Wait for a while until LTspice XVII starts up If the message “LTspice XVII has been successfully installed” is displayed, the installation has been successfully completed. Click “OK” when the installation is successful The installation will start, so wait for a while. Wait a moment for the installation to complete What do you observe at the load? What happened? Can you explain this in terms of your previous models? Conclusion: Propose what you think would be the best combination of techniques that one could use to maintain Signal Integrity for these CMOS circuits.You can select 64bit or 32bit in “Executable version (s)” and the folder to install in “Installation Directory”. Set up this SPICE model and run your simulation as before. Series Matching at the Source End and Parallel Matching at the Load End Problem #10: One would think that the best one could dowould be a simultaneous combination of the two matching techniques (series matching at the source and parallel matching at the load) that we have simulated. What do vou observe? ive an expression for the reflection coefficient It at the capacitive 5.3. Plot the clock and load signals for one duty cycle. Deri load, and explain what the reflected signal is for the case of this parallel match at the load? Use the same clock signal that you used in problem #6 and run the simulator.

Matching at the Load Problem #9: Now, in your SPICE model, place a 50 ? resistor in parallel (shunt) prior to the oad ofthe transmission line. Derive an expression for the reflection coefficient Isource at the source and explain what the reflected signal is for the case of this series match at the source? Use the same clock signal that you used in problem #6 and run the simulator. Matching at the Source Problem #8: In your SPICE model, place a 40 ? resistor in series prior to the input to the transmission line. We will try a number of techniques to see if we can correct some of these problems in the Integrity of the Signals (Signal Integrity). Matching Techniques for Signal Integrity As was seen in the previous section, impedance mismatches at the generator (Thevenin source) and at a reactive load can spoil the signal integrity of digital signals, thus resulting in high Bit Error Rates (BER).

Spice software free download