1 *//////////////////////////////////////////////////////////////////////
2 * (C) National Semiconductor, Inc.
3 * Models developed and under copyright by:
4 * National Semiconductor, Inc.
6 */////////////////////////////////////////////////////////////////////
7 * Legal Notice: This material is intended for free software support.
8 * The file may be copied, and distributed; however, reselling the
11 *////////////////////////////////////////////////////////////////////
12 * For ordering or technical information on these models, contact:
13 * National Semiconductor's Customer Response Center
14 * 7:00 A.M.--7:00 P.M. U.S. Central Time
16 * For Applications support, contact the Internet address:
17 * amps-apps@galaxy.nsc.com
18 * ///////////////////////////////////////////////////////////////////
21 * 1. Input resistance (Rin) for these JFET op amps is 1TOhm. Rin is
22 * modeled by assuming the option GMIN=1TOhm. If a different (non-
23 * default) GMIN value is needed, users may recalculate as follows:
24 * Rin=(R1||GMIN+R2||GMIN), where R1=R2,
25 * to maintain a consistent Rin model.
27 *//////////////////////////////////////////////////////////
28 *LF356 Monolithic JFET-Input OP-AMP MACRO-MODEL
29 *//////////////////////////////////////////////////////////
31 * connections: non-inverting input
33 * | | positive power supply
34 * | | | negative power supply
38 .SUBCKT LF356/NS 1 2 99 50 28
41 *Low input bias current = 30pA
42 *Low input offset current = 3pA
43 *High input impedance = 1Tohm
44 *Low input offset voltage = 1mV
46 ****************INPUT STAGE**************
49 *^Input offset current
60 ***********COMMON MODE EFFECT***********
63 *^Quiescent supply current
64 *EOS 7 1 POLY(1) 16 49 3E-3 1
65 BEOS 7 1 V=3E-3+V(16,49)
66 *Input offset voltage.^
70 *********OUTPUT VOLTAGE LIMITING********
76 **************SECOND STAGE**************
79 *F1 9 98 POLY(1) VA3 0 0 0 1.5944E7
80 BF1 9 98 I=1.5944e7*I(va3)^3
88 *********COMMON-MODE ZERO STAGE*********
94 **************OUTPUT STAGE**************
109 ***************MODELS USED**************
111 .MODEL DX D(IS=1E-15)
112 .MODEL JX PJF(BETA=1.25E-5 VTO=-2.00 IS=30E-12)