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- LT1056 Asymmetric SR Demo (Output = V(55))
- *
- * Walt Jung
- * LT1056 asymmetric slewing JFET op amp macromodel
- * 06/28/90
- *
- * This circuit is an example of one which some might first assume
- * to be trivial. It is, after all, just a picture of an op amp
- * slewing! But, in consideration of the past modeling of P
- * channel JFET input op amps such as LF355/56 and OP15/16
- * families, maybe it is not trivial at all. This is for the
- * simple reason that the asymmetric slew characteristics of this
- * very popular class of op amps has not been properly modeled
- * heretofore!
- *
- * This circuit is a simple voltage follower, set up for the
- * same conditions as the data sheet test circuit for the LT1056.
- * This op amp is a precision JFET input op amp, one topologically
- * related to the LF156/356 and OP16 types. The actual device slew
- * response is shown on p 2-223 (top left) of the LTC 1990 data book.
- * Like the real device, the simulation here exhibits a positive slew
- * rate of about 1/2 that of the negative slew.
- *
- * In this demo, the Probe CMD file supplied calls up display parameters
- * which show a single plot of the LT1056 output.
- *
- .OPT ACCT LIST NODE OPTS NOPAGE
- .WIDTH OUT=80
- .TEMP 27
- .TRAN 1US 5US
- VIN 2 0 AC 1 PULSE (-10 10 1us .01US .01US 2US 4US)
- .PROBE
- .IC V(55)=0
- *
- VCC 52 0 +15V
- VEE 53 0 -15V
- R1 51 55 1
- R2 2 50 1
- Cl 55 0 100pF
- * (+) (-) V+ V- OUT
- XU1 50 51 52 53 55 LT1056
- *
- .SUBCKT LT1056 3 2 7 4 6
- VCM2 40 4 2.0000E+00
- RD1 40 80 9.6458E+02
- RD2 40 90 9.6458E+02
- J1 80 102 12 JM1
- J2 90 103 12 JM2
- CIN 2 3 4.0000E-12
- RG1 2 102 2.0000E+00
- RG2 3 103 2.0000E+00
- C1 80 90 1.5000E-11
- ISS 7 12 5.6000E-04
- GOSIT 7 12 90 80 2.8000E-04
- GCM 0 8 12 0 1.3052E-08
- GA 8 0 80 90 1.0367E-03
- R2 8 0 1.0000E+05
- C2 1 8 3.0000E-11
- GB 1 0 8 0 7.8368E+01
- RO2 1 0 4.9000E+01
- RSO 1 6 1.0000E+00
- ECL 18 0 1 6 1.7377E+01
- GCL 0 8 20 0 1.0000E+00
- RCL 20 0 1.0000E+03
- D1 18 20 DM1
- D2 20 18 DM1
- D3A 131 70 DM3
- D3B 13 131 DM3
- GPL 0 8 70 7 1.0000E+00
- VC 13 6 2.9595E+00
- RPLA 7 70 1.0000E+04
- RPLB 7 131 1.0000E+05
- D4A 60 141 DM3
- D4B 141 14 DM3
- GNL 0 8 60 4 1.0000E+00
- VE 6 14 2.9595E+00
- RNLA 60 4 1.0000E+04
- RNLB 141 4 1.0000E+05
- IP 7 4 4.4400E-03
- DSUB 4 7 DM2
- .MODEL JM1 PJF (IS=1.1000E-11 BETA=9.5964E-04 VTO=-1.000000E+00)
- .MODEL JM2 PJF (IS=9.0000E-12 BETA=9.5964E-04 VTO=-9.998600E-01)
- .MODEL DM1 D (IS=1.0000E-15)
- .MODEL DM2 D (IS=8.0000E-16 BV=4.8000E+01)
- .MODEL DM3 D (IS=1.0000E-16)
- .MODEL DM4 D (IS=1.0000E-09)
- .ENDS LT1056
- **
- * (C) COPYRIGHT LINEAR TECHNOLOGY CORPORATION 1990
- * All rights reserved.
- *
- * Linear Technology Corporation hereby grants the users of this
- * macromodel a non-exclusive, nontransferrable license to use this
- * macromodel under the following conditions:
- *
- * The user agrees that this macromodel is licensed from Linear
- * Technology and agrees that the macromodel may be used, loaned,
- * given away or included in other model libraries as long as this
- * notice and the model in its entirety and unchanged is included.
- * No right to make derivative works or modifications to the
- * macromodel is granted hereby. All such rights are reserved.
- *
- * This model is provided as is. Linear Technology makes no
- * warranty, either expressed or implied about the suitability or
- * fitness of this model for any particular purpose. In no event
- * will Linear Technology be liable for special, collateral,
- * incidental or consequential damages in connection with or arising
- * out of the use of this macromodel. It should be remembered that
- * models are a simplification of the actual circuit.
- *
- * Linear Technology reserves the right to change these macromodels
- * without prior notice. Contact Linear Technology at 1630 McCarthy
- * Blvd., Milpitas, CA, 95035-7487 or telephone 408/432-1900 for
- * datasheets on the actual amplifiers or the latest macromodels.
- *
- * ----------------------------------------------------------------------- *
- .END
-