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Figure 79: Schematic with Parasitics Applied to the Inverter Figure 80: Changing Between Views San Francisco State University Nano‐electronics and Computing Research Lab 74
Now go ahead and simulate your circuit as you did previously in Part 3 of the tutorial. From the schematic window, go to Tools SAE to open a new SAE window. When comparing the two waveforms (inverter parasitics to inverter without parasitics) take note of the difference between delays from VIN to VOUT for transient waveforms. Part 7: Hierarchical Design Using smaller instances of circuits to create a larger design is what hierarchical design is all about. In this section, we use an inverter we created earlier and use several instances of it to create a five stage oscillator in schematic and layout views. Create a new schematic for the ring oscillator by going to New CellView from the Custom Designer Console and setup the options as shown in figure 81 below. The setup is as follows: Library: mylibrary Cell Name: ringOscillator View Name: schematic Editor: SE - schematic Click OK when done. San Francisco State University Nano‐electronics and Computing Research Lab 75
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Full Custom IC Design Flow Tutorial
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Introduction This manual assumes yo
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Figure 1: Shell commands Custom Des
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Figure 4: New Cell View After you c
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Figure 8: PMOS and NMOS Next add wi
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Adding Pins To add pins to the sche
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Figure 13: Schematic with Pins San
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Figure 15: Inverter Symbol You may
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Figure 17: Drawing an Instance of a
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Figure 19: Edit property You final
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1. Choose the appropriate Models fo
Page 23 and 24: Figure 23: DC Simulation Window 3.
Page 25 and 26: Figure 24: Clicking on the Schemati
Page 27 and 28: Figure 26: Save State Window To run
Page 29 and 30: Figure 28: Transient Analysis Wave
Page 31 and 32: Figure 31: Grouping Waveforms Delay
Page 33 and 34: Figure 33: Delay Waveform Measureme
Page 35 and 36: Figure 35: Rise/Fall Waveform Measu
Page 37 and 38: Figure 37: Average Waveform Measure
Page 39 and 40: Figure 39: Frequency Waveform Measu
Page 41 and 42: Figure 41: Layout Window Go to rule
Page 43 and 44: Figure 44: Layout with NWell and Di
Page 45 and 46: Figure 46: Drawing a Path San Franc
Page 47 and 48: Figure 48: Drawing Contacts Select
Page 49 and 50: Figure 51: Labeling Connections San
Page 51 and 52: Figure 53: DRC Setup Click OK. Afte
Page 53 and 54: Figure 57: DRC Errors San Francisco
Page 55 and 56: In the layout window go to Verifica
Page 57 and 58: Under Control Variables tab set DEC
Page 59 and 60: Figure 63: LVS Done Confirmation Al
Page 61 and 62: Figure 66: LPE Setup Main Tab Under
Page 63 and 64: Under Output Options tab type make
Page 65 and 66: Figure 70: Passing LPE After LPE ha
Page 67 and 68: Figure 72: Parasitic View Zoom You
Page 69 and 70: Figure 74: Testbench Circuit for In
Page 71 and 72: Figure 76: Hierarchy Editor In orde
Page 73: Figure 78: Open Design with Parasit
Page 77 and 78: For the pins, go to Add Pins and p
Page 79 and 80: Figure 84: Ring Oscillator Symbol N
Page 81 and 82: window. In the add instance window,
Page 83 and 84: instances of the inverter layout on
Page 85 and 86: Figure 90: Ring Oscillator Layout F
Page 87 and 88: Debug any DRC errors that come up.
Page 89 and 90: At this point if there are any LVS
Page 91 and 92: If LPE ran successfully, a parasiti
Page 93 and 94: Figure 99: Configurations File Setu
Page 95 and 96: Figure 101: Ring Oscillator Testben
Page 97 and 98: Figure 103: Setting up Convergence
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