Cadence Schematic Tutorial. EEE5320/EEE4306 Fall 2015 University of Florida ECE

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1 Cadence Schematic Tutorial EEE5320/EEE4306 Fall 2015 University of Florida ECE 1

2 Remote access You may access the Linux server directly from the NEB Computer Lab using your GatorLink username and password. If you would like to access the Linux servers from your own computer or off-campus, you may refer to the Accessing Linux Servers Remotely tutorial in order to set up a remote connection 2

3 Run Cadence and create a new library On the linux terminal, type the italicized commands below - source /apps/settings : source cadence settings - icfb & : Run cadence Click File New Library on the Library Manager menu to make a new library Click Attach to existing tech library on the new pop-up window, choose TSMC 0.24u CMOS025/DEEP (5M, HV FET) and click OK. 3

4 Create a new schematic Click your library on the library manager. Click File New Cell View on the library manager. On the new pop-up window, choose Composer-Schematic for a new schematic (or Virtuoso for a new layout). You will see a blank schematic window. 4

5 Run ADE and choose a simulator On the schematic menu, click Tools Analog Environment. In the Analog Design Environment (ADE) window, click Setup Simulator/Directory/Host. Choose spectre as your simulator. 5

6 Add tsmc 0.25um model file You can download the tsmc 0.25um model file from or googling. On ADE, click Setup Model Libraries. On the new window, click Browse, and choose the model file you downloaded. Then click Add in the bottom left of the Model Library Setup window Now you are ready to use the tsmc 0.25um process. 6

7 Draw a circuit Click instance on the left side of the schematic window to add resistors, caps or TRs. On the component browser, the two commonly used libraries are NCSU_Analog_Parts and analoglib. You can find NMOS in NCSU_Analog_Parts N_Transistors and PMOS in P_Transistors. Choose nmos4 and pmos4. You can find voltage and current sources, resistors, caps and so on in analoglib. You have to make sure that the names of the pmos and nmos should be matched to the names of the model file you have. - tsmc25dp and tsmc25dn in this instruction. 7

8 Draw a circuit (continued) You can find the voltage sources in analoglib Sources Independent. Use vdc for V0 and vpulse for V1 in the figure below When placing each instance you can set the parameters in the Add Instance window. Otherwise you can add the part to the schematic, select the component, and click Property in the toolbar on the left side of the Schematic Editor Enter the parameters for V1 (vpulse) as shown in the figure on the left Set the remaining parameters for V0, P0, and N0 as shown in the figure on the right 8

9 Run transient simulations In the ADE window click Analyses Choose tran or click Choose Analysis on the right side. Enter a Stop Time and check Enabled. Click OK. Click Simulation Netlist and Run or click Netlist and Run on the right side of the ADE window. You MUST SAVE your schematic every time you run a simulation, otherwise the last saved schematic will be simulated. 9

10 Plot transient outputs On ADE, choose Session Options Waveform Tool Wavescan or AWD depending on your preference. You will see different plot settings. After running a tran simulation, click Results Direct Plot Transient Signal, and then choose the voltage node on the schematic that you want to plot. Press ESC on your keyboard to plot. To plot the transient current you should first save the current by clicking, on ADE, Options To Be Saved Select On Schematic, and then choose the current you want to save (To choose a current, select the node at which you want to measure the current). Then, run a tran simulation, and plot the current. You can also use the calculator. You can do almost every function using the calculator. For example if you want average current of the inverter, run the calculator by Tools Calculator on ADE. Click it on the calculator for transient current, on your schematic click the current flowing through Vdd. On your calculator, click Special Functions average, click plot or check Evaluate Buffer on the calculator to plot or calculate, respectively. 10

11 Run DC simulation Apply a proper DC voltage input that every transistor is working on its saturation region. In the ADE, select Analyses Choose dc. Check Save DC Operating Point, Enabled, and then OK. Uncheck Enabled under tran. Run a simulation (Simulation Netlist and Run). In order to see the node voltage or DC operating point, in ADE choose Results Annotate DC Node Voltages or DC Operating Points, respectively. To return to the original schematic annotation, in ADE choose Results Annotate Design Defaults In order to see the detailed operating point of a transistor, in ADE choose Results Print DC Operating Points, and select the specific transistor 11

12 Run AC simulation Apply a proper DC voltage input to the inverter. Add an AC voltage of 1 V on the voltage source. Click Analyses Choose ac, put a specific frequency range, check Enabled, and run. To plot the gain of the inverter, click on ADE Results Direct Plot Main Form. On the new window, choose ac and db20, choose the output node on the schematic to plot the AC response. 12

13 Make a symbol Define inputs (vdd, vin, and gnd) and outputs (vout) using pins. Remove/Delete the voltage sources (V0 and V1) and gnd terminal Select Pin on the left side of the Schematic Editor Enter the Pin Name and Direction then place the pin in the schematic window To place multiple pins with the same direction: Enter each pin name separated by a space Set Placement to Multiple Then place the pins on the schematic in the order they appear under Pin Names 13

14 Make a symbol (continued) On the schematic, click Design Create Cellview From Cellview. Click OK on the new window, then you will have a symbol with a rectangular block. Modify the block depending on your preference. Make sure the pin names of the schematic and the symbol are matched. On the symbol window, click Edit Origin, and then click the input pin for origin. To use the symbol you made, click instance on a schematic window, choose the library in which the inverter is located, and choose the symbol you just made. Then put it on the schematic. 14

15 Save and load ADE setting To save the ADE settings, click on ADE Session Save State. On the new window check Cellview, check settings that you want to save on What to save. Click OK. To use the setting that you saved, click on ADE Session Load State. On the new window check Cellview and click OK. Make sure your simulator is spectre before loading the state (Refer to Slide 5). 15

16 Useful hotkeys <On the schematic> i : instance w : wire l : wire name label p : add pin q : Property c : copy m : Move r : rotate s : stretch f : fit to screen shift+z : zoom out ctrl +z: zoom in f8: check and save L : Add note x : go into the inside of a symbol for read only. shift+x : go into the inside of a symbol for edit. b : Return to upper level of symbols. Ctrl+r : redraw/refresh schematic view <On the plots> a : marker A b : marker B d : delta markers 16

17 Useful default instances location NMOS PMOS Resistor, Capacitor, and Inductance Vdd, gnd Volt and current sources VCCS, VCVS, CCCS and CCVS NCSU_Analog_Parts N_Transistors nmos4 NCSU_Analog_Parts P_Transistors pmos4 analoglib Passives analoglib Globals analoglib Sources Independent analoglib Sources Dependent 17

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