*Begin LM6181 Model *//////////////////////////////////////////////////////////////////// *rev.b *July2007 *L5 and RL5 added to enhance the output impedance vs. frequency performance *CIN2 changed to better match the datasheet *////////////////////////////////////////////////////////////////////// * (C) National Semiconductor, Inc. * Models developed and under copyright by: * National Semiconductor, Inc. *///////////////////////////////////////////////////////////////////// * Legal Notice: This material is intended for free software support. * The file may be copied, and distributed; however, reselling the * material is illegal * /////////////////////////////////////////////////////////////////// * User Notes about what the CFA models can do: *Supply voltage dependant input offset voltage (Vos) *Temperature dependant input offset voltage (TCVos) *Supply voltage dependant input bias current (Ib+ & Ib- PSR) *Temperature dependant input bias current (TCIb+ & TCIb-) *Input voltage dependant input bias current (Ib- CMRR) *Non-inverting input resistance *Asymmetrical output swing *Output short circuit current (Isc) *Supply voltage dependant supply current *Quiescent and dynamic supply current *Input voltage dependant input slew rate *Input voltage dependant output slew rate *Multiple poles and zeros in open-loop transimpedance (Zt) *Supply voltage dependant input buffer impedance *Supply voltage dependant open-loop voltage gain (Avol) *Feedback resistance dependant bandwidth *Accurate small-signal pulse response *Large-signal pulse response *DC and AC common mode rejection ratio (CMRR) *DC and AC power supply rejection ratio (PSRR) *White and 1/f voltage noise (en) *White and 1/f current noise (in) *********************Modeled but not tested***************** *Asymmetrical output slew rate. *Input common mode input range. *Supply voltage dependant input slew rate. ***************************Not modeled********************** *Third-order large signal effects. *Self heating effects. *////////////////////////////////////////////////////////// *LM6181 CURRENT FEEDBACK OP-AMP MACRO-MODEL *////////////////////////////////////////////////////////// * * connections: non-inverting input * | inverting input * | | positive power supply * | | | negative power supply * | | | | output * | | | | | * | | | | | .SUBCKT LM6181/NS 1 2 99 50 41 * *Features: (TYP.) *High bandwidth = 100MHz *High slew rate = 2000V/uS *Current Feedback Topology *NOTE: Due to the addition of PSRR effects, model must be operated * with symetrical supply voltages. To avoid this limitation * and disable the PSRR effects, see EOS below. * ****************INPUT STAGE************** * GI1 99 5 POLY(1) 99 50 243.75U 2.708E-6 GI2 4 50 POLY(1) 99 50 243.75U 2.708E-6 FI1 99 5 VA3 100 FI2 4 50 VA4 100 Q1 50 3 5 QPN Q2 99 3 4 QNN GR1 5 6 5 6 2.38E-4 *^4.2K noiseless resistor C1 6 99 .468P GR2 4 7 4 7 2.38E-4 *^4.2K noiseless resistor C2 7 50 .468P GR3 99 8 99 8 1.58E-3 *^633ohm noiseless resistor V1 99 10 .3 RE1 10 30 130 D1 30 8 DX GR4 50 9 50 9 1.58E-3 *^633ohm noiseless resistor V2 11 50 .3 RE2 11 31 150 D2 9 31 DX Q3 8 6 2 QNI Q4 9 7 2 QPI DS1 3 12 DY VA3 12 5 0 DS2 13 3 DY VA4 4 13 0 GR6 1 99 1 99 5E-8 *^20MEG noiseless resistor GR7 1 50 1 50 5E-8 *^20MEG noiseless resistor GB1 1 99 POLY(2) 99 50 56 0 -1.2E-6 4E-8 1E-3 FN1 1 0 V18 1 GB2 99 2 POLY(3) 99 50 1 49 55 0 18.5E-6 -1.5E-7 -1E-7 -1E-6 FN2 2 0 V17 1 EOS 3 1 POLY(5) 99 50 45 0 47 0 57 0 59 61 -2.8E-3 9.3E-5 1 1 1 1 *To run on asymetrical supplies, change to 0.................^.^ CIN1 1 0 2P CIN2 2 0 5.75P * **************SECOND STAGE************** * I3 99 50 4.47M R8 99 49 7.19K R9 49 50 7.19K V3 99 16 1.7 D3 15 16 DX D4 17 15 DX V4 17 50 2.0 EH 99 98 99 49 1 G1 98 15 POLY(2) 99 8 50 9 0 1.58E-3 1.58E-3 *Fp1 = 27.96 KHz R5 98 15 2.372MEG C3 98 15 2.4P * ***************POLE STAGE*************** * *Fp=250MHz G2 98 20 15 49 1E-3 R14 98 20 1K C4 98 20 .692P * ***************POLE STAGE*************** * *Fp=250 MHz G3 98 21 20 49 1E-3 R15 98 21 1K C5 98 21 .692P * ***************POLE STAGE*************** * *Fp=275 MHz G4 98 22 21 49 1E-3 R16 98 22 1K C6 98 22 .5787P * ***************POLE STAGE*************** * *Fp=500 MHz G5 98 23 22 49 1E-3 R17 98 23 1K C7 98 23 .3183P * ***************PSRR STAGE*************** * G10 0 45 99 0 1.413E-4 L3 44 45 26.53U R25 44 0 10 G11 0 47 50 0 1.413E-4 L4 46 47 2.27364U R26 46 0 10 * ************THERMAL EFFECTS************* * I12 0 55 1 R27 0 55 10 TC=3.453E-3 7.93E-5 I13 0 56 1E-3 R28 0 56 1.5 TC=9.303E-4 8.075E-5 I14 0 57 1E-3 R29 0 57 3.34 TC=3.111E-3 * ************* NOISE SOURCES************* * V15 58 0 .1 D9 58 59 DN R30 59 0 726.4 V16 60 0 .1 D10 60 61 DN R31 61 0 726.4 V17 62 0 0 R32 62 0 73.6 V18 63 0 0 R33 63 0 1840 * **************OUTPUT STAGE************** * F6 99 50 VA7 1 F5 99 35 VA8 1 D7 36 35 DX VA7 99 36 0 D8 35 99 DX E1 99 37 99 23 1 VA8 37 38 0 R35 38 40 50 V5 33 40 5.3V D5 23 33 DX V6 40 34 5.3V D6 34 23 DX CF1 41 2 2.1P L5 40 41 31N RL5 40 41 100K * ***************MODELS USED************** * .MODEL QNI NPN(IS=1E-14 BF=10E4 VAF=62.9 KF=6.7E-14) .MODEL QPI PNP(IS=1E-14 BF=10E4 VAF=62.9 KF=6.7E-14) .MODEL QNN NPN(IS=1E-14 BF=10E4 VAF=62.9 KF=4.13E-13) .MODEL QPN PNP(IS=1E-14 BF=10E4 VAF=62.9 KF=4.13E-13) .MODEL DX D(IS=1E-15) .MODEL DY D(IS=1E-17) .MODEL DN D(KF=1.667E-9 AF=1 XTI=0 EG=.3) * .ENDS *$