TSH111(2002) データシートの表示（PDF） - STMicroelectronics
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TSH111 Datasheet PDF : 19 Pages
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TSH110-TSH111-TSH112-TSH113-TSH114
(fig.38): Input / Output Isolation vs. Frequency..
0
-20
-40
-60
-80
-100
-120
0.01
Standby mode
0.1
1
10
100
Frequency (MHz)
Choice of the Feedback Circuit
The TSH11x is a serie of current feedback
amplifiers. For a current feedback structure the
bandwidth depends on the value of the feedback
components and the value of supply voltage.
A good choice of these components is necessary
to achieve the gain flatness and the stability.
The following table shows the typical -3dB
bandwidth and 0.1dB bandwidth assuming
different gains and power supply on 100Ω load.
Please see also the Closed Loop Gain vs.
Frequency curves on page 8 of the datasheet.
(fig.39): Non-inverting and Inverting Implementation..
Input
+
_
Rfb
RG
Cfb
Non-Inverting
Gain = 1+ Rfb / RG
Output
49.9Ω
50Ω
Input Rin
Rfb
_
Cfb
+
R
Inverting
Gain = - Rfb / Rin
Output
49.9Ω
50Ω
(tab.1): Closed-loop Gain and Feedback Components.
VCC
Gain
Rfb
(V)
(Ω)
Cfb
-3dB 0.1dB
Bw
Bw
(pF) (MHz) (MHz)
+10
510
-
46
14
-10
510
-
42
13
+2
680
2
105
50
±6
-2
680
2
90
40
+1
2.2k
2
170
30
-1
2.2k
2
110
20
+10
510
-
37
13
-10
510
-
36
12
+2
680
2
±2.5
-2
680
2
93
25
86
30
+1
2.2k
2
130
50
-1
2.2k
2
100
18
Inverting Amplifier Biasing
In this case a resistance (R on fig.40) is necessary
to achieve a good input biasing.
This resistance is calculated by assuming the
negative and positive input bias current. The aim
is to make the compensation of the offset bias
current which could affect the input offset voltage
and the output DC component.
Assuming Ib-, Ib+, Rin, Rfb and a zero volt output,
the resistance R comes : R = Rin // Rfb .
(fig.40): Compensation of the Input Bias Current..
Ib-
Rin
Rfb
_
Vcc+
+
Ib+
R
Vcc-
Output
Load
16/19
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