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- LTC LT1115 RIAA audio circuit demo (Out=V(58))
- *
- * Walt Jung
- * RIAA moving magnet phono preamp (40dB gain)
- * 1/02/90
- *
- * This preamp circuit is an example which uses a number of PSpice
- * features to advantage while demonstrating the performance of the
- * LT1115 op amp for audio. The circuit below is shown on page one of
- * the device data sheet. SPICE simulation was used in the initial
- * development of this circuit, and it served also as a test case
- * for the LT1115 model itself. As noted on the data sheet, there
- * is good agreement between the simulated frequency response and that
- * actually measured on the real circuit.
- *
- * In this demo, the Probe CMD file supplied calls up display parameters
- * which show the (equalized) RIAA response with a scale of 10Hz-100kHz,
- * with a +/- 0.5dB window. You can easily modify these, to suit yourself.
- * Further comments are contained below (as ";").
- *
- .OPT ACCT LIST NODE OPTS NOPAGE RELTOL=0.0001
- .WIDTH OUT=80
- .TEMP 27
- .AC DEC 10 10 100KHZ
- VIN 1 0 AC 0.1
- .PROBE
- .OP
- .INC RIAAREF.INC ; inverse RIAA pre-emph. network, -40dB @ 1kHz
- * ; (ala Jung/Lipshitz; see ".INC" file)
- VCC 52 0 +18V
- VEE 53 0 -18V
- Rin 3 50 10
- R1 57 100 210k
- R2 100 101 17.8k
- Rz 101 51 499
- Ra1 51 102 22.6 ; tweak these two for gain adj., (if desired)
- Ra2 102 103 210 ;
- Rx 57 58 562
- Ry 58 0 25k ; simulated load of next stage
- Rd 57 103 82.5k
- C1 57 100 15000pF
- C2a 100 101 3900pF
- C2b 100 101 330pF
- Cba 103 0 2200uF
- Cbb 103 0 4.7uF
- Cc 58 0 3900pF
- E1010 57 0 56 0 1
- C4 56 0 1pf
- R5 55 56 100
- * (+) (-) V+ V- OUT
- XU1 50 51 52 53 55 LT1115
- .SUBCKT LT1115 3 2 7 4 6
- RC1 7 80 7.0736E+01
- RC2 7 90 7.0736E+01
- Q1 80 2 10 QM1
- Q2 90 3 11 QM2
- C1 80 91 750E-12
- RXC1 91 90 50
- CXC1 91 90 400E-12
- C2 1 98 30.000E-12
- RXC2 98 8 1K
- CXC2 98 8 10.000E-12
- CIN 2 3 15E-12
- RIN 2 3 2E4
- DDM1 2 104 DM2
- DDM3 104 3 DM2
- DDM2 3 105 DM2
- DDM4 105 2 DM2
- RE1 10 12 -4.4157E+01
- RE2 11 12 -4.4157E+01
- IEE 12 4 4.5006E-04
- RE 12 0 4.4439E+05
- CE 12 0 1.5789E-12
- GCM 0 8 12 0 7.0854E-09
- GA 8 0 80 90 1.4137E-02
- R2 8 0 1.0000E+05
- GB 1 0 8 0 2.6731E+02
- RO2 1 0 7.9000E+01
- RS 1 6 1
- ECL 18 0 1 6 2.7910E+01
- GCL 0 8 20 0 1
- RCL 20 0 1E3
- D1 18 20 DM1
- D2 20 18 DM1
- D3A 131 70 DM3
- D3B 13 131 DM3
- GPL 0 8 70 7 1
- VC 13 6 3.6394
- RPLA 7 70 1E4
- RPLB 7 131 1E5
- D4A 60 141 DM3
- D4B 141 14 DM3
- GNL 0 8 60 4 1
- VE 6 14 3.6394
- RNLA 60 4 1E4
- RNLB 141 4 1E5
- IP 7 4 7.450E-03
- DSUB 4 7 DM2
- .MODEL QM1 NPN (IS=8.0000E-16 BF=3.4615E+03)
- .MODEL QM2 NPN (IS=8.0155E-16 BF=6.4286E+03)
- .MODEL DM1 D (IS=1.000E-19)
- .MODEL DM2 D (IS=8.000E-16)
- .MODEL DM3 D (IS=1.000E-20)
- .ENDS LT1115
- **
- * (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
-