Zetex Symbol Library for Windows Versions of PSpice



	Introduction

	The Spice models web page contains a symbol library ZETEXM.SLB that 
	allows Windows versions of PSpice to be used to schematic capture 
	circuits with the complete range of Zetex discrete devices for 
	simulation. The symbols have been designed for the Zetex discrete 
	model library ZMODELS.LIB which is also on the Spice models web page.


	The symbol library does NOT provide individual symbols for every 
	Zetex device in ZMODELS.LIB. Although such a library would be 
	convenient to use, the large number of symbols required would restrict 
	its use to full versions of Windows PSpice only. E.g. Student / demo 
	versions would not allow a library of this sort to be used. To enable 
	circuits including Zetex devices to be simulated using both full and 
	student versions of PSpice, a generic symbol library named ZETEXM.SLB 
	has been provided. Although this library contains only ten symbols, it 
	will allow any device in ZMODELS.LIB to be included in a simulation 
	(however a little more work is required than when using an individual 
	symbol library).


	Installation

	The following installation instructions apply from PSpice V5.3 with 
	small variations from V7.1 onwards. Please check the syntax for your 
	release in the manual.  There is little change from Microsim to later 
	Cadence versions of PSpice.
	

	To use the symbol library you will have to:-
	
	1) Install Windows PSpice. (Run SETUP.EXE from Windows Program Manager).
	2) Copy the symbol library file ZETEXM.SLB to the directory chosen for 
	libraries in PSpice.
	3) Copy the model library ZMODELS.LIB to the directory chosen for 
	libraries in PSpice.
	4) Start the Schematics program and select Configure (V5.3) or Options 
	(from V6.2)
	   Select Editor Configuration.
	      Select Library Settings.
	         Type ZETEXM (no return).
	            Click on Add, then OK, then OK to exit from Configure.
	 If all is well, this adds the Zetex symbol library to PSpice. You 
	 may get an error here if PSpice cannot find the symbol library. If 
	 so, check the directory names entered and that you have copied 
	 ZETEXM.SLB into the PSpice LIB/LIBRARY directory.
	5) Select Analysis.
	      Select Library and Include Files.
	         Type \(Library path)\ZMODELS.LIB (no return)
	            Click on Add Library* then OK. (Note the * is important, 
		    pick the Add with this.)

	You will now be able to enter and simulate circuits using any Zetex 
	device models. You should not need to repeat the symbol and model 
	library setting described above again for any new circuits you enter 
	as the setting should have been permanently stored.


	Contents of the ZETEXM Symbol Library

	Following is a list of the two and three pin symbols supplied in the 
	ZETEXM.SLB library. Included is a generic or master symbol for every 
	device type to be found in the ZMODELS.LIB model library. The ZTXN, 
	ZTXP, ZD, ZVD, ZZD and ZSD symbols represent single component models 
	and appropriate symbols from PSpice Breakout library could be utilized 
	instead without problem. The remaining symbols (ZVN, ZVP, ZTXND and 
	ZTXPD) represent multiple component sub circuits and so must be used 
	if you wish to use the models for these components supplied in the 
	ZMODELS.LIB library.

	The symbols supplied in ZETEXM.SLB are as follows:-

	ZTXN     NPN bipolar transistors
	ZTXP     PNP bipolar transistors
	ZVN     N-channel MOSFETs
	ZVP     P-channel MOSFETs
	ZD      Switching and rectifier diodes
	ZVD     Varicap diodes
	ZZD     Zener diodes
	ZSD     Schottky diodes
	ZTXND    NPN Darlington transistors
	ZTXPD    PNP Darlington transistors


	Using the ZETEXM Symbol Library

	If you have used symbols from the Breakout library before, 
	then you will probably be familiar with the technique necessary to 
	use the ZETEXM symbol library. The procedure for including Zetex 
	devices in your schematic is as follows:- 
		
		Draw your schematic using appropriate generic parts obtained 
		from the ZETEXM symbol library. For instance, if you want to 
		use a Zetex NPN transistor (such as a ZTX689B), select ZTXN. 
		For a PNP select ZTXP, etc. Save your schematic then rename 
		the generic or master devices to their correct Zetex type 
		numbers by selecting each in turn (i.e. highlight with the 
		mouse), clicking on EDIT, then Model, Change Model Reference 
		and then finally typing the name of the actual Zetex device 
		you want to simulate (e.g. ZTX689B for instance). The edited 
		devices will now have the correct name and model reference. 
		When you have renamed all the generic components, re-save 
		the schematic. The circuit should then be ready to simulate.


	If you have any questions concerning the ZETEXM.SLB symbol library, 
	please contact Zetex. We would be very interested to hear any comments 
	you may have.
  
	(c) Zetex Semiconductors plc 24/8/06.  Version 2.
	All trademarks acknowledged.