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THS3115IPWPR データシート(PDF) 13 Page - Texas Instruments

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部品番号 THS3115IPWPR
部品情報  LOW-NOISE, HIGH-SPEED, CURRENT FEEDBACK AMPLIFIERS
PDF  35 Pages
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI1 - Texas Instruments

THS3115IPWPR データシート(HTML) 13 Page - Texas Instruments

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49.9 W
1
F
m
100-
Load
W
+V
S
+V
S
R
G
-V
S
R
F
R
5.11
ISO
W
49.9 W
1
F
m
100-
Load
W
+V
S
+V
S
R
G
-V
S
R
F
5.11 W
27pF
750 W
R
IN
49.9 W
1
F
m
100-
Load
W
+V
S
+V
S
R
G
-V
S
R
F
Ferrite
Bead
49.9 W
1
F
m
100-
Load
W
+V
S
+V
S
R
G
-V
S
R
F
5.11 W
27pF
Ferrite
Bead
F
IN
THS3112
THS3115
www.ti.com
SLOS385C – SEPTEMBER 2001 – REVISED SEPTEMBER 2010
Placing a small series resistor, RISO, between the
Figure 46 shows another method used to maintain
amplifier output and the capacitive load, as shown in
the low-frequency load independence of the amplifier
Figure 44, is an easy way of isolating the load
while isolating the phase shift caused by the
capacitance.
capacitance at high frequency. At low frequency,
feedback is mainly from the load side of RISO. At high
frequency, the feedback is mainly via the 27-pF
capacitor. The resistor RIN in series with the negative
input is used to stabilize the amplifier and should be
equal to the recommended value of RF at unity gain.
Replacing RIN with a ferrite of similar impedance at
about 100 MHz as shown in Figure 47 gives similar
results with reduced dc offset and low frequency
noise.
Figure 44. Resistor to Isolate Capacitive Load
Using a ferrite chip in place of RISO, as Figure 45
shows, is another approach of isolating the output of
the amplifier. The ferrite impedance characteristic
versus frequency is useful to maintain the low
frequency load independence of the amplifier while
isolating the phase shift caused by the capacitance at
high frequency. Use a ferrite with similar impedance
to RISO, 20 Ω to 50 Ω, at 100 MHz and low
Figure 46. Feedback Technique with Input
impedance at dc.
Resistor for Capacitive Load
Figure 45. Ferrite Bead to Isolate Capacitive Load
Figure 47. Feedback Technique with Input Ferrite
Bead for Capacitive Load
Copyright © 2001–2010, Texas Instruments Incorporated
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Product Folder Link(s): THS3112 THS3115



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