
91-11Ampliers and Signal Conditioners
and all input currents must be calculated at the actual temperature,
I I T
I
T
T T= +
∆
∆
× −( ) ( )
a J a
(9
1
.17
)
Temperature
mu
st
be co
rrected
be
cause
o
set
vo
ltage
an
d
cu
rrent
sp
ecications
fo
r
in
strumentation
am
pliers
a
re
m
easured
s
hortly
a
er
t
urning
t
he
d
evice
o
n,
h
ence
b
efore
i
t
w
arms
u
p
.
Error contributions from nite interference rejection are
v
v
V
r
c
e
S
CMRR
PSRR= + ∆ ×
(9
1
.18
)
where
the
C
MRR
e
must be that at the frequency for v
c
the PSRR must be that for the frequency of the ripple ∆V
S
It is assumed that both frequencies fall inside the bandpass for the signal of interest v
d
.
e e
quivalent
i
nput voltage noise