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- Welcome to the latest release of Linear Technology Corporation op
- amp macromodels! This is release 3.0 dated April, 1993. It
- contains more than 30 macromodels for LTC's newest op amps. See
- mm30info.com for a complete listing. Included are models for LTC's
- complete line of video amplifiers, high speed amplifiers, difference
- and gain controlled amplifiers, and current feedback amplifiers.
-
- Our current literature includes:
-
- 1990 Linear Databook
- 1992 Linear Databook Supplement
- 1990 Linear Applications Handbook (AN1-AN40, DN1-DN32)
- 1993 Linear Applications Handbook (AN41-AN54, DN33-DN69)
-
- Datasheets for many of the amplifiers that are new to this disk,
- as well as the LT1122 fast settling, JFET input operational
- amplifier, are not included in the 1990 or 1992 databooks.
- Call your local sales office or (800) 637-5545 to request
- individual datasheets.
-
- Linear Technology SPICE Macromodel Release History
-
- Release 2.01 (12/90) contained:
-
- A) Entirely new macromodels for several new operational
- amplifiers, notably the LT1220 high speed CB process op
- amp, and the LT1122 high speed JFET input op amp. Also
- included is a model for the LM10 series.
-
- B) All macromodels are now released in full upper case
- code, for those using SPICE simulators not having
- internal case conversion. Note that the individual model
- files have their specification headers left intact. For
- a compact "LIB" file, the models in this format are
- without the header information. Please also note that
- there have been no actual CODE changes to these older
- models, only the new format.
-
- Release 2.0 (6/90) contained:
-
- A) Entirely new models for PMOS input, chopper-stabilized
- op amps, such as the LTC1050 family and related devices.
-
- B) A new macromodel for JFET input amplifiers which offers
- asymmetric slewing response (an LTC first!). Just as in
- real parts such as the LT1055/56/57/58 familiies, and
- also in such industry standards as "LF355/56" and
- "OP15/16" types.
-
- C) An across-the-board expansion of all model families
- to include both premium (A) and relaxed grade (D or S/S8)
- parts. Users now have access to all op amps in the LTC
- catalog for both type and grade, with the total number of
- devices supported over 125. (Note: Models are now stored
- both in ASCII form individually, or in a PACKED
- "OPLTC.LIB" format, in "MM21_LIB.EXE". See "MM21INFO").
-
-
- D) Not quite so major, but still useful are:
-
- 1) Several additional on diskette demos, with
- annotation within (print out the "CIR" files).
-
- 2) Additional SPICE related batch file utilities
- to ease installation and configuration (type
- NAME of "NAME.BAT", for operation). See "E)"
-
- E) Take note of the following (new or updated) files,
- which are found in the root dir of this diskette (A:\):
-
- XCPY2DSC BAT (copy utility, use as below)
- DEMOLTC BAT (updated DEMO batch file)
- PROBEDEV BAT (a customizer for PROBE.DEV)
- REPROBE BAT (re-run PROBE sans PSpice)
-
- Continue through this README file using "PgDn", reading all
- major sections, as noted by a number prefix ( "1)" etc.).
- You may print out all of this information by following the
- instructions at the screen bottom (recommended!)
-
- Copying Files
-
- 1) Copying the files to other media:
-
- To copy all the files to your hard disk, you should have the
- DOS utility "XCOPY" available on your PC system (here,
- "available" means somewhere along your DOS path). To copy all
- the files onto either a hard disk or a RAM echo disk using
- XCOPY, a batch file "XCPY2DSC" is provided on the macromodel
- diskette. To use it, the command syntax is as follows:
-
- "A:XCPY2DSC A: C:"
-
- The example shown above will copy all the files from your LTC
- macromodel diskette in the "A:" drive to the "C:" drive,
- re-creating the directory structure of the original diskette
- on your hard disk. Note also that if you want to use a named
- DIR on a hard disk, such as "C:\LTC", you must use your DOS
- commands to create this DIR, BEFORE using XCPY2DSC. Then log
- into this DIR, and run XCPY2DSC as above.
-
-
-
-
- In the event you don't have access to XCOPY, you can manually
- copy all the files from A:\ and A:\SPICE with the DOS "COPY"
- command, to "C:\LTC", as in the two following sequences: This
- will create a working directory called "LTC", on drive C:.
-
- (first sequence, commands as you enter them)
- C:|CD\
- MD\LTC
- CD\LTC
- COPY A:\*.*
-
- (second sequence of commands)
- MD\SPICE
- CD\SPICE
- COPY A:\SPICE\*.*
- MD\DRIVERS
- CD\DRIVERS
- COPY A:\SPICE\DRIVERS\*.*
-
-
- You are now ready to run from your hard disk!
-
- 2) Running the demonstration circuit files:
-
- The batch file "DEMOLTC" runs a DEMO version of PSpice, doing
- a test simulation with one of several specified ".CIR" files
- supplied on this diskette. (While you CAN do this on the
- floppy, copy to a hard disc for speed.. see "1)" above).
-
- Usage of the demo batch file is "DEMOLTC" or "DEMOLTC 1007",
- which will run the default LT1007 demo file. Alternately, the
- various other demos below are available:
-
- A summary of DEMOLTC usage:
-
- "DEMOLTC" (to run the default LT1007 example),
- "DEMOLTC 1007" (to run the default LT1007 example),
- "DEMOLTC RIAA" (to run an LT1115 audio RIAA circuit demo),
- "DEMOLTC 1056" (to run an LT1056 asymmetric SR demo),
- "DEMOLTC 1078" (to run an LT1078 rectifier demo),
- "DEMO EXAMPLE1" (to run the PSpice Example1)
- "DEMOLTC TEST" (not real, will beep and give instructions)
- (we recommend reading all the "CIR" files for useful info)
-
- 3) A foreword about the files and modeling:
-
- This disc library of SPICE macromodels is being supplied to
- LTC customers as an aid to circuit designs. While the models
- reflect reasonably close similarity to the actual devices in
- terms of performance, their use is not suggested as a
- replacement for breadboarding. Simulation should be used as a
- forerunner or a supplement to traditional lab testing.
-
- As a preface to using these models effectively, it is
- suggested that all users thoughtfully read "Should Ohm's Law
- Be Repealed?", by LTC's Jim Williams. Neglect in doing so may
- cause one or more of the models on this disc to intermittently
- fail. The specific time and mode of the failure will be a)
- When your boss is checking your work, and/or b) The simulation
- results will be false positive, in a manner totally
- indistinguishable from expected positive results.
-
-
-
-
-
- We have placed a good deal of emphasis on making these models
- perform functionally like their real counterparts. The models
- are generated using circuit modeling techniques which
- emphasize proprietary performance aspects of the devices. For
- example, where an LTC op amp has unique micropower/single
- supply characteristics, the models actually reflect this, with
- input clamping and output saturation behavior like the real
- devices (LT1078/79/77, LT1178/LT1179).
-
- While many of models use a single pole frequency response,
- where warranted more complex AC responses are simulated with
- extensions. This allows devices such as the LT1007, the OP-27
- and LT1028 to be simulated with reasonable transient fidelity.
-
- Other LTC model improvements are more subtle and less device
- specific. Examples are in devices which employ new and
- proprietary voltage and/or current limit circuits, developed
- to minimize model gain and/or limiting threshold errors
- without sacrifice to functionality. Chopper-stabilized
- devices such as the LTC1050 use this, and others. The
- asymmetric SR technique is used in the LT1056 and other JFETs.
-
- 4) The macromodel files included in this release are far greater
- in number than in past releases. In lieu of listing them
- here, we supply a utility "MM21INFO", which describes each
- individual file in terms of the number of models it supports,
- creation date, and relative size. Be sure and run this
- utility! It contains important information on re-creating
- models from their packed format (MM21_LIB.EXE => OPLTC.LIB).
-
- We suggest that "OPLTC.LIB" be placed in your PATH and used
- with a ".LIB" statement for easiest access to the family.
- Good luck in your designs and with using these models. We
- hope to be developing other macromodels for LTC devices, in
- the months ahead. Let us know about your experiences with
- these, and do stay in touch with us, to be kept abreast of
- future releases.
-
- For further technical information, refer to the individual
- device data sheets. In all instances, data sheet information
- is the final design guideline for performance guarantees.
-
-
-
- Some related SPICE reading, with "*" prefixed references
- available from LTC literature service, at (800) 637-5545:
-
- References:
-
- [1] Boyle, G.R., "Macromodeling of Integrated Circuit
- Cohn, B.M., Operational Amplifiers", IEEE Journal of
- Pederson, D.O., Solid-State Circuits, Vol. SC-9, # 6,
- Solomon, J.E. December 1974.
-
- [2] Solomon, J.E. "The Monolithic Op Amp: A Tutorial Study",
- IEEE Journal of Solid-State Circuits,
- Vol. SC-9, # 6, December 1974.
-
- [3] Krajewska, G. "Macromodeling of FET/Bipolar Operational
- Holmes, F.E. Amplifiers", IEEE Journal of Solid-State
- Circuits, Vol. SC-14, # 6, December 1979.
-
- * [4] Jung, W. G., "An LT1013 Op Amp Macromodel",
- Linear Technology Design Note # 13, July, 1988.
-
-
- * [5] Jung, W. G., "A SPICE Op Amp Macromodel for the LT1012",
- Linear Technology Design Note # 28, November,
- 1989.
-
- * [6] Jung, W. G., "Questions and Answers on the SPICE Macromodel
- Library", Linear Technology Application Note # 41,
- April, 1990.
-
- [7] Jung, W. G., "Using Op Amp Macromodels",
- Electronic Products, June 1990.
-
- [8] Jung, W. G., "Models Can Mimic Behavior of Real Op Amps",
- Electronic Design, October 25, 1990.
-
- * [9] Jung, W. G., "Using the LTC Op Amp Macromodels",
- Linear Technology Applications Note # 48,
- November, 1991.
-
-
-
- For further information contact LTC at:
- Linear Technology Corporation
- 1630 McCarthy Blvd., Milpitas, CA
- 95035 (408) 432-1900
-
- For custom models, or models for parts not included on this disk:
- Willow Electronics, Inc.
- 1268 Harbor Cut
- Okemos, MI 48864-3499
- (517) 349-4303
-
- For information on PSpice, contact MicroSim at:
- MicroSim Corporation
- 20 Fairbanks, Irvine, CA
- 92718 (714) 770-3022
-