Let's Program the Transistors
Resistive divider circuit can alternatively be called as voltage divider circuit. Such a circuit is shown in the following figure: This circuit divides the input voltage Vin depending on the resistance values according to the following formula: Vout = Vin x (R2/(R1 + R2)) Vout is the output voltage, which is nothing but the voltage…
Now we are ready to simulate the layout view off this cell. Let’s open up the schematic view of the cell and copy the SPICE code. Go back to the layout view and paste the SPICE code. Increase the text size of the spice code to 10 by going to its object property (Ctrl+I). The…
Open the layout view of the Resistive_divider cell and then copy/paste (Ctrl+C/Ctrl+V) an additional resistor. Running a DRC (pressing F5) on the above layout results in the following error. By pressing > we see that there is too little space between the N-wells. Move the Nodes apart until the layout passes the DRCs. Of-course the…
Now we would simulate the resistive divider circuit which has been built, and would observe the output voltage w.r.t. a particular input voltage. For this we need to write a SPICE code which would give the description of the input voltage and would indicate the type of simulation we want to perform. Writing SPICE Code…
Before starting the schematic design let’s celebrate the fact that the most commonly used following shortcuts in our daily life are also valid for Electric VLSI. Now we would build a resistive divider circuit. Go to the schematic view of the Resistive_divider cell. Select the N-Well resistor Node and then copy the same by pressing Ctrl+C….
LTspice is a free software which performs SPICE simulations for electronic circuits. We use LTspice for spice simulation of the circuit designed in Electric. Setting in Electric Following are the steps to be followed to set up LTspice with Electric: Ensure LTspice is installed on your computer. Go to File –> Preferences –> Categories –>…
This process checks the connection of the n-well and p-substrate. The C5 process used here is an n-well process. The p-type substrate is common to all NMOS devices and should be grounded. One of the electrical rule checks (ERCs) is to verify that the p-well (in this case p-substrate) is always connected to ground. Further,…
Layout vs. Schematic (LVS) in Electric is checked using Network Consistency Checking (NCC) To check this, execute Tools –> NCC –> Schematic and Layout views of Cell in Current Window. You can run this command being in any design window (schematic / layout). We can execute the above command by only pressing ‘L‘ as we have…
Key Binding binds a key; when pressed will execute a command from the menu to which it is bound. You can bind a key to a command as below: Go to File -> Preferences –> Categories –> General –> Key bindings Then in Key Binding USER Preferences we can choose any command to assign a…
We should keep on checking the Design Rule Check throughout designing (both in case of schematic and layout) to make sure whether there is any error or not. To check DRC you can execute Tools –> DRC –> Check Hierarchically or you can press F5. Once DRC is checked, you can see result in the…