* OrCAD Model Editor - Version 9.0 *$ * ADA4937 SPICE Macro-model, TRW, CK, ADI rev A; 4/2007 * * Copyright 2006 by Analog Devices, Inc. * * Refer to "README.DOC" file for License Statement. Use of this model * indicates your acceptance with the terms and provisions in the License Statement. * * This model will give typical performance characteristics * for the following parameters; * * closed loop gain and phase vs bandwidth * output current and voltage limiting * offset voltage (is non-static, will vary with gain) * ibias (again, is static, will not vary with vcm) * slew rate and step response performance * (slew rate is based on 10-90% of step response) * current on output will be reflected to the supplies * Vocm is varable and include input typical offset * distortion is not characterized * cmrr is not characterized in this version. * * Node assignments * FD output neggative * | FD oputput positive * | | non-inverting input * | | | inverting input * | | | | positive supply * | | | | | negative supply * | | | | | | output positive * | | | | | | | output negative * | | | | | | | | vocm input * | | | | | | | | | .SUBCKT ADA4937 9b 3b 3a 9 99 50 71b 71 110 *** positive input left side *** I 99 5 6E-4 Q1 50 2 5 QX vos 3a 2 -1.95E-3 *** RAIL CLIPING *** Dlim+ 75a 14b Dx Vlim+ 99 14b 1.7 Dlim 14c 75a Dx Vlim 14c 50 1.7 Dlim- 13b 76a DX Vlim- 13b 50 1.7 Dlim-B 76a 13C Dx Vlim-B 99 13C 1.7 *** VOCM INPUT RAIL CLIPING *** DOCMa 100 100a dx VOCMa 99 100a 1.8 DOCMb 100b 100 DX VOCMb 100b 50 1.8 *** negative input right side *** I1 99 6 6E-4 Q2 50 9 6 QX *** Input capacitance/impedance *** Cin 3a 9 1p *** pole, zero pole stage *** G1 13 14 5 6 5E-3 c1 14 13 100f c2 98 13 155f c3 98 14 155f r11 98 13 RX1 250K r12 98 14 RX1 250K *** pole zero stage( POSITIVE SIDE) *** gp1 0 75 14 98 1 RP1 75 0 RX2 1 CP1 0 75 100f *** pole zero stage( NEGATIVE SIDE) *** gp2 0 76 13 98 1 RP2 76 0 RX2 1 CP2 0 76 100f *** output stage Negative side *** D17 76 84 DX VO1 84 70 .177V VO2 70 85 .177V D16 85 76 DX G30 70 99c 99 76 91E-3 G31 98c 70 76 50 91E-3 RO30 70 99c RX2 11 RO31 98c 70 RX2 11 VIOUT1 99 99c 0 VIOUT2 98c 50 0 VIOUT3 70 71 0 *** Output Stage Positive side *** D17b 75 84b DX VO1b 84b 70b .177V VO2b 70b 85b .177V D16b 85b 75 DX G30b 70b 99d 99 75 91E-3 G31b 98d 70b 75 50 91E-3 RO30b 70b 99d RX2 11 RO31b 98d 70b RX2 11 VIOUTB1 99 99d 0 VIOUTB2 98d 50 0 VIOUTB3 70b 71b 0 *** VOCM STAGE *** Gocm_a 0 75 110 0 1 Gocm_b 0 76 110 0 1 Rocm1 100 99 400K Rocm2 50 100 400K Voffset 100 110 -1E-3 *** CURRENT MIRROR TO SUPPLIES POSITVIE SIDE *** FO1 0 99 poly(2) VIOUT1 VI1 -19.803E-3 1 -1 FO2 0 50 poly(2) VIOUT2 VI2 -19.803E-3 1 -1 FO3 0 400 VIOUT1 1 VI1 401 0 0 VI2 0 402 0 DM1 400 401 DX DM2 402 400 DX *** CURRENT MIRROR TO SUPPLIES NEGATIVE SIDE *** FO1B 0 99 poly(2) VIOUTB1 VIB1 -19.803E-3 1 -1 FO2B 0 50 poly(2) VIOUTB2 VIB2 -19.803E-3 1 -1 FO3B 0 400B VIOUTB1 1 VIB1 401B 0 0 VIB2 0 402B 0 DMB1 400B 401B DX DMB2 402B 400B DX *** Reference Stage *** Eref 98 0 poly(2) 99 0 50 0 0 0.5 0.5 *** Feadback output *** Vfd+ 3b 71b 0 Vfd- 9b 71 0 *** Buffer Stage *** Vbf1 76 76a 0 Vbf2 75 75a 0 *** Models *** .MODEL QX PNP (BF=228 Is=1E-15 KF=1E-11 AF=1.25) .MODEL RX1 Res(T_abs=-273.56) .MODEL RX2 Res(T_abs=-275) .MODEL RX3 Res(T_abs=-275) .MODEL DX D(IS=1E-14) .MODEL DEN D(IS=1E-9 RS=0.002 KF=7E-10 AF=1) .ENDS *$