mm5025

HA5025 SPICE Macromodel (CFA)
TM
Application Note
August 1997
MM5025.2
Introduction
The HA5025 is a low cost quad amplifier optimized for RGB
video applications and gains between 1 and 10. It is a current feedback amplifier; thus it yields less bandwidth degradation at high closed loop gains than voltage feedback
amplifiers. The macromodel for the HA5025 is PSPICE (registered trademark of MicroSim Corp.) compatible, and may
be compatible with other simulation programs as well. The
model file is in ASCII format and may be viewed/edited with
any text editor.
All models require a trade-off between accuracy and complexity (simulation time). Intersil's models emulate the nominal performance of a typical device, and are designed to
match the typical performance curves in the device data
sheet.
SPICE simulations should not be considered a substitute for
breadboarding a circuit; rather, they should be used to select
preliminary component values and to verify the validity of a
design approach.
Do not rely on simulations to predict device performance
when deviating from the operating conditions specified in the
data sheet (e.g. just because the model works with ±1V supplies, don't assume that the actual amplifier does). Instead,
refer to the data sheet performance curves, or call the factory for assistance (321-724-7143).
The HA5025 model is configured as a subcircuit for easy
incorporation into larger circuit files. When using PSpice, call
a subcircuit from the top level circuit file by adding a .LIB
statement to point to the file containing the subcircuit (e.g.
.lib c:\models\HA5025.cir), and by including a subcircuit call
of the following form:
xname
(e.g. x22
+IN
101
-IN
111
V+
113
V114
OUT
112
model name
HA5025)
Note that the node order in the subcircuit call follows the
industry standard, and the order is also documented in the
comment section at the beginning of the model file.
Model Description
The macromodel schematic is shown in Figure 1, and the
PSPICE listing for the macromodel follows. The model topology consists of two main functional sections: a buffer
between the two input pins, and an output section between
the negative input pin and the output pin.
1
The topology of the input buffer section is a basic four transistor voltage follower. Additional components are added to
this structure in order to model the critical characteristics of
the actual amplifier. Of these additional components, some
are used to model both the slew limiting of the negative input
and the fractional step feed-through from the positive input to
the negative input. Other elements model the voltage and
current limiting of the negative input. The bias current of the
positive input and the high frequency voltage gain are also
accounted for in the input buffer section model.
The output section is a transimpedance amplifier constructed from four stages: current probe, mid stage, frequency transfer, and output drive. The current probe stage
monitors the current through the negative input pin and also
models the input offset voltage. The mid stage is used for the
bias current of the negative input and for power supply gains.
The frequency transfer block consists of two poles and two
zeros for modelling the high frequency open-loop transimpedance gain. The output drive stage accounts for several
characteristics including: the output slew limits and resulting
transimpedance gain bandwidth product, the saturation
delay times, and the voltage and current limiting at the output.
In addition to the two main functional sections, smaller constructs and individual components are used to model other
important amplifier characteristics. Specifically, one section
is used to capture the change in the voltage limits of the output as a function of the current through the negative input.
Power supply currents are also modelled with an additional
section. At each amplifier pin, several individual components
are included to model high frequency impedance characteristics, including any significant package parasitics.
The model is optimized for operation at ±5V, but it operates
over the full range of supply voltages. Beware, the model
does not simulate various breakdown conditions such as
exceeding the maximum ratings, but it does have input limiting. The model does not include input voltage or current
noise, or temperature effects.
The poles and zeros of the transimpedance frequency transfer section have been located with great care to insure that
the performance for 3 different inverting and non-inverting
gains is matched closely to the curves given in the data
sheet. Also, the pole/zero placement insures that the transient response matches that shown in the data sheet.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2002. All Rights Reserved
Application Note MM5025
V+
RE1
GIP
DEN
DIP
CIP
ROP
MACROMODEL
OUTPUT
STAGE (SEE BELOW)
V+
+
IQIP
+IN
QOP
CIP2
MOUT
-
RIN
VGRO
QOM
QIM
CIM2
RIG
CIN2
GRM
CIN
LAO
RAO
OUT
ROM
DIM
CIM
GI
-IN
RAI
LAI
CAI
CAO
CPF
VCPI
FIGURE 1A. HA5025 AMPLIFIER MACROMODEL SCHEMATIC
FREQUENCY TRANSFER
(SIMPLE POLE ZERO PAIRS)
C1A
MID-STAGE WITH BIASING AND
POWER SUPPLY DEPENDENCE
C2A
RZ1A
RZ2A
CURRENT PROBE
AND OFFSET VOLTAGE
I-
RITV
EVC
HITV
+
-
-
GII
GCC
GPC
GMI2
GMI3
VMI
CC
R1A
RT
R2A
GINA
G2A
AMPLIFIER OUTPUT DRIVE WITH LIMITING
RA
MOUT
CMI
R2
GOUTA
G2P
RD
GRD
GRDP
DH
ECC
FIGURE 1B. HA5025 MACROMODEL OUTPUT STAGE
2
DL
EEE
DP
EXP
DN
EXN
Application Note MM5025
SUPPORT CIRCUIT
DE1
DEH
DEL
DO1
DOL
GEN
GOR
REH
DCL
DCH
DOH
DC2
DC1
+
-
ROH
GCR
VO1
RCH
+
RCL
VC2
POWER SUPPLY
CURRENT GENERATOR
OUTPUT VOLTAGE LIMITING vs INPUT CURRENT
V+
REE
CRE
RCC
D66
CRC
GH
D55
FCC
FEE
IPS
GPS = I(OUT)
DPS
V-
FIGURE 1C. HA5025 MACROMODEL ADDITIONAL SUPPORT CIRCUITS
HA5025 SPICE Macro Model Listing
.SUBCKT HA5025 101 111 113 114 112
LAO 115 112 250N
RAO 115 112 125
CAO 112 0 4P
LAI 116 111 40N
RAI 116 111 200
CAI 116 111 3P
CPI 111 0 1.5P
CPF 112 111 2.5P
.MODEL QIP PNP IS=1.0E-16 BF=130 NF=2.2
.MODEL QIM NPN IS=1.0E-16 BF=220 NF=2.5
.MODEL QOP NPN IS=1.0E-16 BF=180 NF=2.2
.MODEL QOM PNP IS=1.1E-16 BF=50 NF=2.5
ROP 113 117 +3.50000000E+02
QOP 117 118 119 QOP
CIP2 120 118 +2.73661972E-13
CIP 113 118 +6.70000000E-13
3
Application Note MM5025
HA5025 SPICE Macro Model Listing
(Continued)
DIP 118 113 DLIM
GIP 113 118 121 0 +3.35000000E-04
DIPL 114 118 DLIM
QIP 114 120 118 QIP
RIN 101 120 280
CIN2 101 0 .03P
RIG 101 0 +2.60000000E+07
CIN 120 0 .5PF
QIM 113 120 122 QIM
GIM 122 114 121 0 +3.35000000E-04
DIML 122 113 DLIM
DIM 114 122 DLIM
CIM 122 114 +6.29914530E-13
CIM2 120 122 +3.24501425E-13
QOM 123 122 119 QOM
ROM 123 114 +3.50000000E+02
.MODEL DLIM2 D N=.01 IS=1E-10
RE1 113 124 15K
DEN 124 113 DEN
.MODEL DEN D BV=+5.26 IBV=1.0E-10
VMI 102 108 +0.00000000E+00
EVC 119 108 POLY 4 101 0 102 0 113 0 114 0 -2.13000009E-03 +3.09210000E-04
++3.09210000E-04 -3.15209991E-04 -3.03210009E-04 0 0 -1.88100000E-06
++1.88100000E-06 0 -1.88100000E-06 +1.88100000E-06 +1.88100000E-06 0
+-1.88100000E-06
CMI 102 0 +1.00000000E-16
HITV 0 125 VMI 1
RITV 125 0 1
GII 0 126 POLY 2 121 0 125 0 0 0 0 0 -1.97000000E-03
GCC 0 126 POLY 5 121 0 101 0 102 0 113 0 114 0 0 +7.80927711E-09 0 0 0 0 0
++2.78640749E-11 +2.78640749E-11 +3.49558407E-11 +2.07723091E-11 0 0 0 0 0 0
+0 0 0 0 0 0 0 0 0 0 0 -1.92087022E-16 +1.92087022E-16 0 -1.92087022E-16
++1.92087022E-16 +1.92087022E-16 0 -1.92087022E-16
RT 126 0 +1.00000000E+00
GPC 0 126 POLY 3 121 0 113 0 114 0 0 0 0 0 0 +0.00000000E+00 +0.00000000E+00
R1A 127 0 +2.14285714E+03
RZ1A 127 128 -1.14285714E+03
C1A 128 0 +7.95798186E-13
GINA 0 127 126 0 +4.66666667E-04
R2A 129 0 +2.25000000E+03
RZ2A 129 130 -1.25000000E+03
C2A 130 0 +3.18319274E-13
G2A 0 129 127 0 +4.44444444E-04
GOUTA 106 0 129 0 -1.00000000E+00
GRD 104 0 106 0 +1.02164070E+01
G2P 0 106 POLY 2 113 0 114 0 0 +3.46573590E-07
4
+3.46573590E-07
Application Note MM5025
HA5025 SPICE Macro Model Listing
(Continued)
GRDP 104 0 POLY 2 113 0 114 0 0 -5.10970951E+00
-5.10970951E+00
R2 106 0 +1.44269504E+06
CC 106 104 +1.00000000E-14
RD 104 0 +3.32000000E+02
RA 104 109 +8.00000000E+00
DH 104 100 DH +1.00000000E+00
DL 131 104 DL +1.00000000E+00
.MODEL DH D IS=+2.16387643E-14 N=.2
.MODEL DL D IS=+6.45488179E-15 N=.2
ECC 100 0 POLY 2 113 0 132 0 -1.10000000E+00 1 1
EEE 131 0 POLY 2 114 0 133 0 +1.13500000E+00 1 1
FCC 0 132 POLY 1 VMI -1.30520000E-04 +1.30000000E-01
RCC 132 0 1K
CRC 132 0 +1.00000000E-10
D55 132 0 DLIMVO
FEE 0 133 POLY 1 VMI +2.19120000E-04 +2.20000000E-01
REE 133 0 1K
CRE 133 0 +1.00000000E-10
D66 0 133 DLIMVO
.MODEL DLIMVO D N=.01 IS=1E-20
DP 104 134 DCL +1.00000000E+00
EXP 134 0 POLY 2 104 0 109 0 0 -1.75393075E-01 +1.17421768E+00
DN 107 104 DCL +1.00000000E+00
EXN 107 0 POLY 2 104 0 109 0 0 +8.82115687E-02 +9.09643047E-01
.MODEL DCL D IS=1E-9 N=1
IPS 113 114 +5.78000000E-03
GPS 135 0 104 109 +1.25000000E-01
GH 113 135 POLY 1 135 114 +1.52098765E-02 -3.04197531E-02 +2.28148148E-02
+-7.60493827E-03 +9.50617284E-04
DPS 135 114 DPS
.MODEL DPS D IS=1E-16 N=+3.40657494E+00
GEN 0 136 POLY 3 113 0 113 0 114 0 +4.00000000E+00 +1.00000000E+00
+-1.00000000E+00 +0.00000000E+00
DEH 136 121 DLIM
REH 121 0 1K
DE1 121 137 DLIM
VO1 137 0 0.99
DEL 0 136 DLIM
.MODEL DLIM D N=.01 IS=1E-20
GRM 102 116 POLY 2 102 116 121 0 0 0 0 0 +1.42857143E+01
GMI2 126 0 POLY 2 104 0 121 0 0 +2.04356846E-10 0 0 -2.04356846E-10
GOR 0 138 POLY 3 109 0 115 0 121 0 -6.40000000E-01 0 0 +1.28000000E+00 1 -2
+0 1
DOH 138 139 DLIM
ROH 139 0 1K
DO1 139 137 DLIM
5
Application Note MM5025
HA5025 SPICE Macro Model Listing
(Continued)
DOL 0 138 DLIM
GRO 109 115 POLY 2 109 115 139 0 0 0 0 0 +1.25000000E+01
GCR 0 140 POLY 3 0 140 121 0 104 109 0 0 0 +1.25000000E+01 0 100
DCH 140 141 DLIM
RCH 141 0 +8.00000000E+04
DC1 141 137 DLIM
DCL 142 140 DLIM
RCL 142 0 +8.00000000E+04
DC2 143 142 DLIM
VC2 0 143 0.99
GMI3 126 0 POLY 3 121 0 141 0 0 142 0 0 -1.10000000E-08 +1.60000000E-08 0
++1.10000000E-08 -1.60000000E-08
.ENDS HA5025
HA5025 Macro Model Performance
Intersil application note AN9523 titled “Evaluation Programs
For SPICE Op Amp Models” was used as a guideline for evaluating the HA5025 performance. Figure 2 shows the noninverting AC transfer function. In the gain of one configuration
the peaking is 2.5dB versus the 3.2dB of peaking shown is the
data sheet. The -3dB bandwidth is 125MHz in both cases.
This is quite good correlation between the model and the data
sheet. Similarly, the non-inverting gains of 2 and 10 closely
match the data sheet transfer functions. In all cases the data
sheet conditions were met during the SPICE analysis; i.e.,
RF = 1kΩ, RL = 400Ω, VSUPPLY = ±5V, and CL = 10pF. The
inverting AC transfer function is shown in Figure 3. Notice that
in the gain of -1 configuration the peaking is 0.5dB versus the
1.5dB of peaking shown on the data sheet, and that the gain
of -2 and -10 curves match those shown in the data sheet.
Again the correlation between the model and the data sheet is
quite good. The small signal pulse response is shown in Figure 4, and the rise time, fall time, propagation delay, and time
domain peaking can be read off this waveform.
GAIN = 1
2.0
0
-2.0
GAIN = 2
GAIN = 10
-4.0
-6.0
1.0
3.0
10
30
FREQUENCY (MHz)
100
300
FIGURE 2. HA5025 NON-INVERTING OP AMP AC TRANSFER
FUNCTION
6
4.0
2.0
0
-2.0
GAIN = -1
GAIN = -2
GAIN = -10
-4.0
-6.0
1.0
3.0
10
30
FREQUENCY (MHz)
100
300
FIGURE 3. HA5025 INVERTING OP AMP AC TRANSFER
FUNCTION
The common mode rejection ratio is obtained through the
use of two identical amplifiers and the equation CMRR =
common mode input voltage divided by the differential input
voltage for a constant output voltage (see Figure 5). The
input for this test is chosen as a 2V square wave. This
enables the evaluation of the worst case CMRR.
6.0
4.0
6.0
Application Note MM5025
120
10
80
5
40
(µA)
I(RF1) - I(RI)
0
I(RF1)
0
I(RI)
VIN
-40
-5
VOUT
-80
-120
0
50
100
150
-10
-10
TIME (ns)
FIGURE 4. HA5025 SMALL SIGNAL PULSE RESPONSE
-5
0
VIN (mV)
5
10
FIGURE 7. HA5025 INPUT CURRENT
6.0
10
4.0
5
2.0
(mV)
0
VIN
V(13)
0
-2.0
V(11) - V(13)
1.3mV
-4.0
-5
1.3 – 3
CMRR = 20LOG -------- 10 = 63.7dB
2
-6.0
1.0
10
30
TIME (ns)
100
300
-10
-10
-5
FIGURE 5. HA5025 CMRR
Figures 6, 7, and 8 show the salient DC parameters for the
HA5025. The input signal for this test is a DC sweep which
enables the evaluation of parameters around zero.
IVEE
(mA)
0
-5
IVCC
-10
-10
-5
5
10
FIGURE 8. HA5025 INPUT OFFSET VOLTAGE
Summary
The macromodel performs well for both the DC and AC
parameters. It is a fraction of a dB off for some AC tests, but
this is acceptable for an approximation. At least the model has
peaking where the op amp has peaking, and the response for
different gains is modeled correctly. The model is just an
approximation! It cannot predict performance to a few percent;
especially when one considers that the circuit layout parameters have such a large effect on high frequency performance.
The model will not predict the actual performance in many circumstances such as non-linearities, limits of performance, or
extended range operation. Only testing will confirm performance out of the normal operating range, and all circuits
should be tested to confirm the model’s predictions.
10
5
0
VIN (mV)
0
VIN (mV)
5
10
FIGURE 6. HA5025 POWER SUPPLY CURRENT DRAIN PER
AMPLIFIER
7
License Statement
The information in these SPICE macromodels (models) is protected by the United States copyright laws. Intersil Corporation
(Intersil) hereby grants users of these models, herein referred
to as licensee, a nonexclusive, nontransferable license to use
these models as long as the licensee abides by the terms of
this agreement. Before using the models, the licensee should
read this license and accept the terms.
Application Note MM5025
The licensee may not sell, loan, rent, lease, or license the
models, in whole, in part, or in modified form, to anyone outside the licensee's company. The licensee may modify these
models to suit his specific application.
These models are provided "AS IS, WHERE IS, AND WITH
NO WARRANTY OF ANY KIND EITHER EXPRESSED OR
IMPLIED, INCLUDING BUT NOT LIMITED TO ANY
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE." In no event will
Intersil be liable for special, collateral, incidental, or consequential damages in connection with or arising out of the use
of these models. Intersil reserves the right to make changes
to the products and the models without prior notice.
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
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TEL: (321) 724-7000
FAX: (321) 724-7946
8
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