Foreword
Processes and operations of this series mainly for recording cadence allergo drawing circuit, the purpose for the quick start circuit fabrication allergo software, thus downplayed introduce circuit area.
cadence allergo draw schematic libraries can be regarded as the first chapter of the series.
Schematic drawing
Continue to use the software diagram drawing the schematic Orcad
top left, click File -> New -> Design. Create a new schematic, named design1.dsn, and save.
Here to note the difference between Orcad schematic organization and AD:
AD: Every file is a sch (a) schematics, multiple schematics (sch multiple files) need to integrate the project (project) in.
Orcad: dsn file is a collection of all the schematics, the concept of multiple schematic page (page) is saved in the file. That is, strictly speaking, a dsn file is a project, rather than a schmatic.
The schematics we need two pages, you need to create two page in the dsn file.
Right-click on the SCHEMATIC1 , select New Page, and then click New, as shown below in two schematics.
Drawing circuit first enters the first page.
Prior to this we have drawn up a library, and put their own special components into them.
First, click on the screen rightmost icon Place part (P). Instructions to complete adding a library according to the arrow in FIG.
After the library addition is complete, the components in the upper right corner directory, find their favorite components, and then double-click the left button, then move the mouse to press the left button is placed on the drawing.
Component arrangement when the left-click component, according to the rotation R, V and H, respectively, according to the axis along the XY mirror.
After the device is put away, starting wiring. Shortcut keys wiring teletext follows:
add power / ground manner shown below. Orcad provides a variety of power symbol, you can choose according to demand.
Further, the power supply is placed shortcut is F, the shortcut key is placed G.
Next we want to add a common component. cadence itself offers a complete library of principle, this is great (AD Hello eager to learn the point ah). Path is as follows (the Cadence is the root of the software is installed) FIG.
Great, yikes.
Seen in the figure below, contain various operational amplifier Amplifier.olb, various connector Connector.olb, and all the basic Discrete.olb devices are commonly used libraries.
To add such components resistance capacitance and inductance, as shown below was added to the library.
Internet connection
Two principle picture is over, this time on the need to take into account the problems between the two schematic diagram of a network connection.
Unfortunately Orcad AD does not use the global network that is connected, so additional operations must be carried out on the schematic, i.e. the outer Videos offpage connector.
offpage connector shown below, the locator.
Each network requires a connection diagram between the two pin pressing need in the format shown in FIG drawn in the drawing.
And "tab connector array" shown below are required on the two maps, to the need to copy another drawing!
Light Painting identify good is not enough, also need to "enable" it.
Need shown in the illustration, the schematic of the sheet (p) to get rid of the case prior to the actual situation is enabled. For example, this is the second page, it is necessary to change "2 of 2", of course, the first page is "1 of 2". The default software is not going to help you change, if not properly distinguish the page number, then the label can not be enabled network links across pages.
Back to the root directory of schematic, is the place, in the left point design1.dsn below.
Then click Tools -> Annotate, the pop-up window:
Press check entry shown in FIG.
Subsequent pop-up window Click OK just fine.
Then readily stored. Each painting can be seen in front of the arrays before there was a small number. 1 illustrates the emergence of additional network and the first page of links, and 2 illustrate the emergence of additional network and the second page of links.
Here I shot a second page, so you can see right in front of all 1.
Here I deliberately made a mistake . I will label the far right a network is not connected to the first page (the same network that is not marked on the label on the first page), so you can see on the far right in front of a no number appears.
Because there is no link and the first page, the software will not enable them.
Then the first page in the correct network numerals plus, then the above operation is again enabled.
As shown below, the rightmost column has successfully been enabled, appeared in front of the number 1.
Add Package
Add allegro package AD are significantly different manner.
In allegro netlist is generated first, and then reintroduced into the library packaged inside the pcb editor. In other words Orcad schematic level, the package can be added not in one step; however AD can be encapsulated in an encapsulating management manager, in the case where there is no PCB can be one step.
allegro particular package was added in two steps: 1. Adding the package name in orcad. 2. Add pcb editor packaged library, a library package then the package name is automatically matched.
Which is apparently only do the first step. Back to the root directory of the project:
Right-click design1.dsn, select edit objects properties. Pop-up window:
adding the various components indicated on the package according to the name of the FIG, fill out as shown below:
