Datasheet
SLOS214C − OCTOBER 1998 − REVISED MARCH 2007
24
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
driving a capacitive load (continued)
+
_
PREAMP
C
LOAD
499 Ω
Input
Output
499 Ω
20 Ω
Figure 61. Driving a Capacitive Load
offset voltage
The output offset voltage, (V
OO
) is the sum of the input offset voltage (V
IO
) and both input bias currents (I
IB
) times
the corresponding gains. The following schematic and formula can be used to calculate the output offset
voltage:
V
OS
+
ǒ
" V
IO
" I
IB)
R
S
Ǔ
ǒ1 )
R
F
R
G
Ǔ" I
IB*
R
F
+
−
V
IO
R
G
R
S
R
F
I
IB−
V
OS
I
IB+
+
−
Figure 62. Output Offset Voltage Model
general configurations
When receiving low-level signals, limiting the bandwidth of the incoming signals into the system is often
required. The simplest way to accomplish this is to place an RC filter at the noninverting terminal of the THS7001
and THS7002 preamplifier (see Figure 63).
V
I
V
O
C1
+
−
R
G
R
F
R1
f
–3dB
+
1
2pR1C1
V
O
V
I
+ ǒ1 )
R
F
R
G
Ǔ
ǒ
1
1 ) sR1C1
Ǔ
Figure 63. Single-Pole Low-Pass Filter