THS4021_16 Datasheet, PDF (13/29 Pages) Texas Instruments – 350-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS

THS4021
THS4022
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SLOS265C – SEPTEMBER 1999 – REVISED JULY 2007
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 schematic and formula of Figure 35 can be used to calculate the output offset
voltage.
R_G
R_F
I_IB–
–
R_S
I_IB+
+
+
–
V_IO
V_OS
VOS
=
(±VIO
±
IIB₊
´ RS )^{æççè}1+
RF
RG
ö
÷÷ø
± IIB_-
´ RF
S0280-01
Figure 35. 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 amplifier (see
Figure 36).
R_G
R_F
V_I
R1
–
V_O
+
C1
f_-3dB
=
1
2pR1C1
V_O
V_I
æ
= ççè1+
R_F
R_G
ö
÷÷ø
æ
çè
1+
1
sR1C1
ö
÷ø
S0281-01
Figure 36. Single-Pole Low-Pass Filter
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