THS4021 Datasheet, PDF (13/22 Pages) Texas Instruments – 350-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS

THS4021, THS4022
350-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS
SLOS265B – SEPTEMBER 1999 – REVISED FEBRUARY 2000
APPLICATION INFORMATION
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:
RF
IIB–
RG
+
–
VI
+
VO
RS
ǒ ǒ ǓǓ ǒ ǒ ǓǓ ^IIB+
+ ) " ₎ ) VOO VIO 1
RF
RG
IIB RS 1
RF
RG
" IIB– RF
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).
RG
RF
–
VI
+
VO
R1
C1
ǒ Ǔǒ Ǔ ^{+ f–3dB}
1
2pR1C1
+ ) ₎ ^VO
VI
1
RF
RG
1
1
sR1C1
Figure 36. Single-Pole Low-Pass Filter
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