Composite Instrumentation Amp Extends CMRR Frequency Range 10
Times : 02/04/02 Electronic Design - Ideas for Design /
Instrumentation amplifiers are the building blocks commonly used
in industrial, medical, and military systems. The primary
benefit of such a component is its ability to reject common-mode
signals while amplifying a differential-input...
Instrumentation amp makes noninverting integrator:
09/19/2002 EDN - Design Ideas / Figure 1a shows the classic
implementation of an integrator. The circuit has two properties
that may be undesirable in same applications: It necessarily
inverts, and it requires a split-supply or midsupply reference.
Figure 1b shows an implementation of an integrator that uses an
LT1789 instrumentation amplifier..
Instrumentation Amp Swings Rail to Rail: 03/03/94 EDN-Design
Ideas / You can combine an instrumentation amplifier and an
inexpensive CMOS op amp to get the better of two worlds: the
precision of a bipolar instrumentation amp and the5V
single-supply operation of the CMOS op amp. The characteristics
of such a circuit depend first on the instrumentation amp you
use. The INA131 delivers50-µV max voltage offset,0.25-µV/°C max
offset drift, and100-dB min common-mode rejection. Next, how
close the output swings to the power supplys rail depends on
which rail-to-rail op amp you use. A Texas Instruments TL2272,
for example, swings outputs to within100 mV of the rails.