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+* AD8221 SPICE Macro-model
+* Description: Amplifier 
+* Generic Desc: 30/36V Bipolar,  IN AMP, Hi CMRR ,Single
+* Developed by: PRB IAP ADI
+* Revision History: 08/10/2012 - Updated to new header style
+* 1.0 (10/2010) - Changed Negative Zero stage to remove the
+*     negative capacitor value.  
+* Copyright 2012 by Analog Devices.
+*
+* Refer to http://www.analog.com/Analog_Root/static/techSupport/designTools/spiceModels/license/spice_general.html for License Statement. Use of this model
+* indicates your acceptance with the terms and provisions in the License Statement.
+*
+* BEGIN Notes:
+*
+* Not Modeled:
+* Temperature effects
+* PSRR
+* Parameters modeled include: 
+*
+* END Notes
+*
+* Node assignments
+*                 inverting input
+*                 |   RG
+*                 |   |    RG
+*                 |   |    |  non_inverting input
+*                 |   |    |    |    negative supply
+*                 |   |    |    |    |    ref
+*                 |   |    |    |    |    |   output
+*                 |   |    |    |    |    |    |     positive supply
+*                 |   |    |    |    |    |    |     |
+.SUBCKT AD8221  IN-  RG-  RG+  IN+  -Vs   REF  VOUT  +Vs         
+** INPUT STAGER1 sub_out sub_neg 10E3
+R1 sub_out sub_neg 10E3
+R2 sub_neg Inverting_Out 10E3
+R3 sub_pos noninverting_out 10001
+R4 REF sub_pos 10k
+R5 RG- N003 24700
+R6 RG+ N010 24724
+D3 N003 P001 D
+D4 P002 N003 D
+V3 P002 VNEGx 0.94
+V4 VPOSx P001 .71
+D5 N010 P003 D
+D6 P004 N010 D
+V5 P004 VNEGx 0.94
+V6 VPOSx P003 .71
+D7 N005 P005 D
+D8 P006 N005 D
+V7 P006 VNEGx 2.0
+V8 VPOSx P005 1.7
+D9 N016 P007 D
+D10 P008 N016 D
+V9 P008 VNEGx 2.0
+V10 VPOSx P007 1.7
+D11 N009 P009 D
+D12 P010 N009 D
+V11 P010 N017 1.7
+V12 N008 P009 1.7
+D13 REF P011 D
+D14 P012 REF D
+V13 P012 VNEGx .3
+V14 VPOSx P011 .3
+D15 sub_pos P013 D
+D16 P014 sub_pos D
+V15 P014 VNEGx 0.9
+V16 VPOSx P013 0.9
+E4 Inverting_Out 0 N003 0 1
+E5 noninverting_out 0 N010 0 1
+V1 VBIAS +Vs 20
+I1 VBIAS Pos_Fdbk 20E-6
+I2 VBIAS Inv_Fdbk 20E-6
+C1 N003 Inv_Fdbk 9.235e-12
+C2 N010 Pos_Fdbk 9.2e-12
+E8 N002 0 N005 0 1
+E9 N013 0 N016 0 1
+VOSI_Neg N004 IN- 25E-6
+VOSI_Pos IN+ N014 24E-6
+VOSO VOUT N009 300E-6
+C3 RG- 0 .200e-12
+C4 RG+ 0 .135e-12
+I23 IN- 0 1.4E-9
+I24 IN+ 0 0.8E-9
+G1 0 IN+ N018 N019 .0025e-9
+R13 IN+ N018 10e9
+R14 N018 IN- 10e9
+R15 +Vs N019 10e9
+R16 N019 -Vs 10e9
+G2 0 IN- N018 N019 .0025e-9
+E10 VPOSx 0 +Vs 0 1
+I3 +Vs -Vs 900E-6
+G3 +Vs -Vs +Vs -Vs 1e-6
+E11 VNEGx 0 -Vs 0 1
+
+H3 N006 N004 V24 4.5
+V24 N001 0 0
+R19 N001 0 .0166
+H4 VX sub_out V25 64
+V25 N007 0 0
+R20 N007 0 .0166
+H5 N015 N014 V26 4.5
+V26 N011 0 0
+R21 N011 0 .0166
+G4 0 N005 N006 N005 1
+G5 0 N016 N015 N016 1
+G6 0 N003 VBIAS Inv_Fdbk 1
+G7 0 N010 VBIAS Pos_Fdbk 1
+G8 0 sub_out sub_pos sub_neg 1
+R10 N005 0 10e9
+R7 N003 0 10E9
+R11 N016 0 10E9
+R8 N010 0 10E9
+R9 sub_out 0 10E9
+Q1 Pos_Fdbk N013 RG+ 0 NPN
+Q2 Inv_Fdbk N002 RG- 0 NPN
+G9 0 N012 VY N009 1
+G10 0 N009 N012 0 .002
+R12 N012 0 1e10
+R17 N009 0 500
+C5 N012 0 1.4e-7
+C6 N009 0 700e-12
+C8 VY 0 1e-9
+*G11 0 VY VALUE = { LIMIT( 1*V(VX,VY), .002, -.002) }
+g11 0 vy vx vy fit ( -18, -.002 18, .002 ) order=1 above=.002 below=-.002
+R22 VY 0 1e9
+R18 VBIAS Inv_Fdbk 1e9
+R23 Pos_Fdbk VBIAS 1e9
+D1 sub_out P015 D
+V2 VPOSx P015 1.7
+D2 P016 sub_out D
+V17 P016 VNEGx 1.7
+
+H1 VPOSx N008 POLY(1) VOSO 0 0 8000
+H2 N017 VNEGx POLY(1) VOSO 0 0 8000
+
+* MODELS USED
+*
+.model D D
+.model NPN NPN
+.ENDS AD8221
+