Difference between revisions of "Tutorials:Cadence:CreatingSchematicTransistorIV"

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(Created page with "= Creating Schematic for Transistor Testing = Click: '''Library Manager:New → Cellview''' ... The create new file form should appear as shown bellow. We will be making a t...")
 
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Click: '''Library Manager:New → Cellview''' ...
 
Click: '''Library Manager:New → Cellview''' ...
  
The create new file form should appear as shown bellow. We will be making a test transistor schematic, so type '''test_transistor''' in the  Cell  block. In the View  block type schematic or from the Type pull-down menu choose ''schematic'' and the View block will be  automatically  filled. In the ''Application'' section, select the following: Open with: ''Schematic  XL'' and check the box next to ''Always  use this application for this type of file.'' Once you make these two  selection, in the future they will be automatically selected.
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The create new file form should appear as shown bellow. We will be making a test transistor schematic, so type '''test_transistor''' in the  Cell  block. In the View  block type schematic or from the Type pull-down menu choose ''schematic'' and the View block will be  automatically  filled. In the ''Application'' section, select the following: Open with: ''Schematic  XL'' and check the box next to ''Always  use this application for this type of file''. Once you make these two  selection, in the future they will be automatically selected.
  
<img src="images/cadence_img/test_transistor1.gif" width="316" height="336">
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: [[File:Tutorials-Cadence-Test_transistor1.gif]]
  
Left click the <strong>OK</strong> button.
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Left click the '''OK''' button.
  
The Virtuoso-Schematic Editing window should be showing on your screen as whon in the figure bellow:
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The Virtuoso-Schematic Editing window should be showing on your screen as shown in the figure bellow:
  
<img src="images/cadence_img/new_schematic2.gif" alt="new_Sch2" width="906" height="726">
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: [[File:Tutorials-Cadence-New_schematic2.gif]]
  
Left click: <strong>Schematic Editing:Add -&gt;Instance...</strong>
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Left click: '''Schematic Editing:Add &rarr; Instance...'''
  
Shortcuts. You may notice letters by some of these menu  choices.  Rather than clicking through all the menus, you can just hit that  button  on the keyboard to the same effect. These are called hot-keys. In the future, you can press <strong>i </strong>in order to insert an instance<em>.</em>
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Shortcuts. You may notice letters by some of these menu  choices.  Rather than clicking through all the menus, you can just hit that  button  on the keyboard to the same effect. These are called hot-keys. In the future, you can press '''i''' in order to insert an instance.
  
A Command Browser window appears.&nbsp; In this window, select <strong>NCSU_Analog_parts</strong> under Library pull down menu.&nbsp; Next click on the <strong>nmos4</strong> selection.&nbsp; The window  should look as shown in the figure bellow.
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A Command Browser window appears. In this window, select '''NCSU_Analog_parts''' under Library pull down menu. Next click on the '''nmos4''' selection. The window  should look as shown in the figure below.
  
<img src="images/cadence_img/test_transistor2.gif" width="226" height="440">
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: [[File:Tutorials-Cadence-Test_transistor2.gif]]
  
Once you select <strong>nmos4</strong>, an Add Instance window appears. Type <strong>nmos4</strong> to choose a four terminal NMOS transistor  in the Cell Name box and <strong>symbol</strong> in the View Name box. Note  that  you can use the Browse button in order to browse through the libraries  and find the cell you want. You can edit the paramters of the <strong>nmos4</strong> cell, such as width, length, etc. For this exercise, keep the default paramters. The Add Instance window is shown in the figure bellow.
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Once you select '''nmos4''', an Add Instance window appears. Type <strong>nmos4</strong> to choose a four terminal NMOS transistor  in the Cell Name box and '''symbol''' in the View Name box. Note  that  you can use the Browse button in order to browse through the libraries  and find the cell you want. You can edit the parameters of the '''nmos4''' cell, such as width, length, etc. For this exercise, keep the default parameters. The Add Instance window is shown in the figure bellow.
  
<img src="images/cadence_img/test_transistor3.gif" width="386" height="846">
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: [[File:Tutorials-Cadence-Test_transistor3.gif]]
  
 
Move the cursor into the editing window. Notice that  there  is a NMOS transistor there instead of the normal cursor. Position it  where  you want to put the transistor, and left click to place it. You can  right  click to rotate the transistor if you want it to face a different  direction  (this is especially useful with pins).
 
Move the cursor into the editing window. Notice that  there  is a NMOS transistor there instead of the normal cursor. Position it  where  you want to put the transistor, and left click to place it. You can  right  click to rotate the transistor if you want it to face a different  direction  (this is especially useful with pins).
  
Press &lt;Esc&gt; to return to a normal cursor after  you  have finished placing all the transistors you want. For this inverter example, place it on the bottom half of the screen on the right side of the  center-line. To rotate press "r".
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Press <Esc> to return to a normal cursor after  you  have finished placing all the transistors you want. For this inverter example, place it on the bottom half of the screen on the right side of the  center-line. To rotate press "r".
  
 
To make life easier?
 
To make life easier?
  
Before trying to place a component, left click the <strong>Hide</strong> button on the Add Component window. This will move it into the  background  so it's out of your way.
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Before trying to place a component, left click the '''Hide''' button on the Add Component window. This will move it into the  background  so it's out of your way.
  
Now we want to add voltage DC sources. Left Click <strong>Editing:  Add-&gt;Instance</strong>.  In<strong> NCSU_Analog_Parts </strong>library; you will find <em>vdc</em><em></em> sources. Place them in  the test circuit.  Left Click <strong>Editing:Add-&gt;Instance.</strong> In <strong>NCSU_Analog_Parts </strong>library, under <em>Voltage_Sources</em> categorie, you will find <em>vdc </em>source. Place them in the test circuit. The Component Browser should look like the one bellow:
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Now we want to add voltage DC sources. Left Click '''Editing:  Add &rarr; Instance'''.  In '''NCSU_Analog_Parts''' library; you will find ''vdc'' sources. Place them in  the test circuit.  Left Click '''Editing:Add &rarr; Instance'''. In '''NCSU_Analog_Parts''' library, under ''Voltage_Sources'' category, you will find ''vdc'' source. Place them in the test circuit. The Component Browser should look like the one bellow:
  
<img src="images/cadence_img/schematic_TestInv_ComponentBrowserVDC.gif" alt="add_vdc" width="226" height="472">
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: [[File:Tutorials-Cadence-Schematic_TestInv_ComponentBrowserVDC.gif]]
  
Select <em>Vdc</em> and  Add Instance window will appear. In the DC Voltage  field  enter <strong>5V</strong>. This window should appear as such:
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Select ''Vdc'' and  Add Instance window will appear. In the DC Voltage  field  enter '''5V'''. This window should appear as such:
  
<img src="images/cadence_img/schematic_TestInv_AddInstanceVDC.gif" alt="add_vdc" width="386" height="495">
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: [[File:Tutorials-Cadence-Schematic_TestInv_AddInstanceVDC.gif]]
  
Place the symbol to the left of the transistor. Now we want to add  ground  lines. Left Click <strong>Editing:  Add-&gt;Instance</strong>.  In <strong>NCSU_Analog_Parts </strong>library, under <em>Supply_Nets</em> categorie, you will find <em>gnd</em> symbol. Place it in the test circuit. The Component Browser should look like the one bellow.
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Place the symbol to the left of the transistor. Now we want to add  ground  lines. Left Click '''Editing:  Add &rarr; Instance'''.  In '''NCSU_Analog_Parts''' library, under ''Supply_Nets'' category, you will find ''gnd'' symbol. Place it in the test circuit. The Component Browser should look like the one bellow.
  
<img src="images/cadence_img/schematic_TestInv_ComponentBrowserGND.gif" alt="gg" width="226" height="440">
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: [[File:Tutorials-Cadence-Schematic_TestInv_ComponentBrowserGND.gif]]
  
Once you select the NCSU_Analog_Parts selection and select Supply_Nets, you will find <em>gnd</em> symbol. The Add Instance windows for <em>gnd</em> should look like the one bellow:
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Once you select the NCSU_Analog_Parts selection and select Supply_Nets, you will find ''gnd'' symbol. The Add Instance windows for ''gnd'' should look like the one bellow:
  
<img src="images/cadence_img/schematic_TestInv_AddInstanceGND.gif" alt="gnd" width="386" height="240">
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: [[File:Tutorials-Cadence-Schematic_TestInv_AddInstanceGND.gif]]
  
Now, we'll add all the wires to make the circuit   work.  Click Editing: <strong>Add -&gt; Wire</strong>. The Add Wire form should appear.  Just  click its <strong>Hide</strong> button. You can refer to the figure bellow  to see how everything is connected together.
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Now, we'll add all the wires to make the circuit work.  Click Editing: '''Add &rarr; Wire'''. The Add Wire form should appear.  Just  click its '''Hide''' button. You can refer to the figure bellow  to see how everything is connected together.
  
Notice that as you get closer to one pin than  another  (including those on devices), a small diamond will show up inside of or  around that pin. That is where you want to click to connect a wire.  Also,  when wiring schematic, leave the wire width at 0, Route method at full,  and (usually) Draw Mode as route. This tells that software to  auto-route  the wires for you. If you put a wire where you don't want it to go, you  can  delete the wire by left clicking <strong>Editing:Edit-&gt;Delete</strong> and  then left  click on the object you want to delete (wire, pin, component, etc. )
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Notice that as you get closer to one pin than  another  (including those on devices), a small diamond will show up inside of or  around that pin. That is where you want to click to connect a wire.  Also,  when wiring schematic, leave the wire width at 0, Route method at full,  and (usually) Draw Mode as route. This tells that software to  auto-route  the wires for you. If you put a wire where you don't want it to go, you  can  delete the wire by left clicking '''Editing:Edit &rarr; Delete''' and  then left  click on the object you want to delete (wire, pin, component, etc. )
  
A picture of what the circuit should   look like is shown below:
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A picture of what the circuit should look like is shown below:
  
<img src="images/cadence_img/test_transistor6.gif" width="906" height="726">
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: [[File:Tutorials-Cadence-Test_transistor6.gif]]
  
Once you are done editing, left click the "check  mark"  icon on the left side of the screen. This will check your work for  connection  errors and will save your work in the library. You can accomplish the  same thing by left clicking <strong>Schematic Editing</strong>:<strong>File -&gt; Check and Save</strong>
+
Once you are done editing, left click the "check  mark"  icon on the left side of the screen. This will check your work for  connection  errors and will save your work in the library. You can accomplish the  same thing by left clicking '''Schematic Editing:File &rarr; Check and Save'''

Revision as of 16:56, 31 October 2010

Creating Schematic for Transistor Testing

Click: Library Manager:New → Cellview ...

The create new file form should appear as shown bellow. We will be making a test transistor schematic, so type test_transistor in the Cell block. In the View block type schematic or from the Type pull-down menu choose schematic and the View block will be automatically filled. In the Application section, select the following: Open with: Schematic XL and check the box next to Always use this application for this type of file. Once you make these two selection, in the future they will be automatically selected.

Tutorials-Cadence-Test transistor1.gif

Left click the OK button.

The Virtuoso-Schematic Editing window should be showing on your screen as shown in the figure bellow:

Tutorials-Cadence-New schematic2.gif

Left click: Schematic Editing:Add → Instance...

Shortcuts. You may notice letters by some of these menu choices. Rather than clicking through all the menus, you can just hit that button on the keyboard to the same effect. These are called hot-keys. In the future, you can press i in order to insert an instance.

A Command Browser window appears. In this window, select NCSU_Analog_parts under Library pull down menu. Next click on the nmos4 selection. The window should look as shown in the figure below.

Tutorials-Cadence-Test transistor2.gif

Once you select nmos4, an Add Instance window appears. Type nmos4 to choose a four terminal NMOS transistor in the Cell Name box and symbol in the View Name box. Note that you can use the Browse button in order to browse through the libraries and find the cell you want. You can edit the parameters of the nmos4 cell, such as width, length, etc. For this exercise, keep the default parameters. The Add Instance window is shown in the figure bellow.

Tutorials-Cadence-Test transistor3.gif

Move the cursor into the editing window. Notice that there is a NMOS transistor there instead of the normal cursor. Position it where you want to put the transistor, and left click to place it. You can right click to rotate the transistor if you want it to face a different direction (this is especially useful with pins).

Press <Esc> to return to a normal cursor after you have finished placing all the transistors you want. For this inverter example, place it on the bottom half of the screen on the right side of the center-line. To rotate press "r".

To make life easier?

Before trying to place a component, left click the Hide button on the Add Component window. This will move it into the background so it's out of your way.

Now we want to add voltage DC sources. Left Click Editing: Add → Instance. In NCSU_Analog_Parts library; you will find vdc sources. Place them in the test circuit. Left Click Editing:Add → Instance. In NCSU_Analog_Parts library, under Voltage_Sources category, you will find vdc source. Place them in the test circuit. The Component Browser should look like the one bellow:

Tutorials-Cadence-Schematic TestInv ComponentBrowserVDC.gif

Select Vdc and Add Instance window will appear. In the DC Voltage field enter 5V. This window should appear as such:

Tutorials-Cadence-Schematic TestInv AddInstanceVDC.gif

Place the symbol to the left of the transistor. Now we want to add ground lines. Left Click Editing: Add → Instance. In NCSU_Analog_Parts library, under Supply_Nets category, you will find gnd symbol. Place it in the test circuit. The Component Browser should look like the one bellow.

Tutorials-Cadence-Schematic TestInv ComponentBrowserGND.gif

Once you select the NCSU_Analog_Parts selection and select Supply_Nets, you will find gnd symbol. The Add Instance windows for gnd should look like the one bellow:

Tutorials-Cadence-Schematic TestInv AddInstanceGND.gif

Now, we'll add all the wires to make the circuit work. Click Editing: Add → Wire. The Add Wire form should appear. Just click its Hide button. You can refer to the figure bellow to see how everything is connected together.

Notice that as you get closer to one pin than another (including those on devices), a small diamond will show up inside of or around that pin. That is where you want to click to connect a wire. Also, when wiring schematic, leave the wire width at 0, Route method at full, and (usually) Draw Mode as route. This tells that software to auto-route the wires for you. If you put a wire where you don't want it to go, you can delete the wire by left clicking Editing:Edit → Delete and then left click on the object you want to delete (wire, pin, component, etc. )

A picture of what the circuit should look like is shown below:

Tutorials-Cadence-Test transistor6.gif

Once you are done editing, left click the "check mark" icon on the left side of the screen. This will check your work for connection errors and will save your work in the library. You can accomplish the same thing by left clicking Schematic Editing:File → Check and Save