參數(shù)資料
型號(hào)： AB-029
元件分類： 差分放大器
英文描述： AB-029 - INPUT FILTERING THE INA117 -200V DIFFERENCE AMPLIFIER
中文描述： 抗體- 029 -輸入過濾INA117 - 200伏差動(dòng)放大器
文件頁(yè)數(shù)： 17/42頁(yè)
文件大?。?/td> 606K
代理商： AB-029
17
SECTION D:
SIMPLIFIED CIRCUIT MODELS
As already mentioned the simplified circuit models provide
a much different simulation approach, because they do not
follow a standard model design. They are micromodels at
the transistor level, therefore each model has its individual
circuit schematic, which are shown on the following pages.
Almost all of the devices of this model level (Level IV) are
wideband/high-speed components with bandwidth capabili-
ties of up to 1GHz. Some models have only one simplified
circuit model available, and are labeled with the suffix “X”.
Other models offer two simplified circuit models. In general,
the models with an “X1” suffix are of equivalent complexity
as the “X” models. They are simpler implementations of the
macromodel and will simulate faster; however, the accuracy
is not as good as with the macromodels with an “X2” suffix
for the same product.
All of these models are found in the CIR_MOD subdirectory
on the disk. These models are designed using different
topologies than mentioned above and several non-linear
elements. Because of the increased number of non-linear
elements in these models, the simulation time is longer, but
the accuracy is improved.
The wideband operational amplifiers that have simplified
circuit macromodels were designed using several subcircuits
that allow the user to implement a variety of configurations.
The OPA622 is a monolithic amplifier that can be config-
ured as a current-feedback amplifier or a voltage-feedback
amplifier. Like typical current-feedback amplifier, the
OPA622 has a constant large-signal bandwidth of 280MHz.
One would expect that when the OPA622 is configured in a
voltage-feedback configuration the bandwidth would change
with gain. This is not the case. When the OPA622 is
configured as a voltage-feedback amplifier, it will again
have a constant bandwidth over a wide gain and output
voltage range. In the voltage-feedback mode, the OPA622
offers the speed advantages of current-feedback amplifiers
and matched input impedance advantage of the voltage-
feedback op amp. The OPA623 is strictly configured as a
current-feedback amplifier, using the same internal design
as the OPA622.
The OPA660 wideband amplifier offers the user an “ideal
transistor” and a buffer. The “ideal transistor” has three
terminals available to the user—a high-impedance input
(base), a low-impedance input/output (emitter) and the cur-
rent output (collector). This “ideal transistor”, otherwise
called an Operational Transconductance Amplifier (OTA),
is constructed using several discrete real transistors on the
chip to give the user superior gain and temperature perfor-
mance, hence, the comparison to an “ideal transistor”.
Although these transistor level models are more accurate
than the other three topology levels used for macromodels
on this disk, the user is cautioned that all models are an aid
to circuit design and not a suggested replacement for bread-
boarding. Simulation should be used as a forerunner or a
supplement to traditional lab testing. The parameters that are
modelled by the transistor level circuit macromodels are
listed in Table X.
TABLE VIIII. Simplified Circuit Models Figure Reference.
FIGURE
DESCRIPTION
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
BUF600/601X1 Circuit Model
BUF600/602X2 Complex Circuit Model
BUF634X Circuit Model
ISO120/121X Circuit Model
ISO130 Circuit Model
MPC100X1 Circuit Model
MPC100X2 Complex Circuit Model
OPA603X Circuit Model
OPA620/621X Circuit Model
OPA622X1 Circuit Model
OPA622X2 Complex Circuit Model
OPA623X1 Circuit Model
OPA623X2 Complex Circuit Model
OPA640X/OPA641X Circuit Model
OPA642X/OPA643X Circuit Model
OPA644X Circuit Model
OPA646X Circuit Model
OPA648X Circuit Model
OPA64x Package and Pad Parasitics
OPA658X Circuit Model
OPA660X1 Circuit Model
OPA660X2 Complex Circuit Model
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