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UPC2709TB-A Datasheet(PDF) 6 Page - celduc-relais

Part # UPC2709TB-A
Description  BIPOLAR ANALOG INTEGRATED CIRCUITS
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Manufacturer  CELDUC [celduc-relais]
Direct Link  http://www.celduc-relais.com/uk/index.asp
Logo CELDUC - celduc-relais

UPC2709TB-A Datasheet(HTML) 6 Page - celduc-relais

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Data Sheet P12653EJ3V0DS00
6
PC2709TB
TEST CIRCUIT
VCC
1 000 pF
F
p
0
0
0
1
F
p
0
0
0
1
C1
C2
L
4
6
1
2, 3, 5
50
50
OUT
IN
C3
COMPONENTS OF TEST CIRCUIT FOR
MEASURING ELECTRICAL CHARACTERISTICS
EXAMPLE OF ACTURAL APPLICATION COMPONENTS
y
c
n
e
u
q
e
r
F
g
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i
t
a
r
e
p
O
e
u
l
a
V
e
p
y
T
e
u
l
a
V
e
p
y
T
C1 to C2
Bias Tee
1 000 pF
C1 to C3
Chip capacitor
1 000 pF
100 MHz or higher
C3
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e
h
g
i
h
r
o
z
H
M
0
1
H
n
0
0
3
r
o
t
c
u
d
n
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p
i
h
C
L
F
p
0
0
0
1
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c
a
p
a
C
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0
1
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e
T
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B
L
10 nH
1.0 GHz or higher
INDUCTOR FOR THE OUTPUT PIN
The internal output transistor of this IC consumes 20 mA, to output medium power. To supply current for output
transistor, connect an inductor between the VCC pin (pin 6) and output pin (pin 4). Select large value inductance, as
listed above.
The inductor has both DC and AC effects. In terms of DC, the inductor biases the output transistor with minimum
voltage drop to output enable high level. In terms of AC, the inductor make output-port impedance higher to get
enough gain. In this case, large inductance and Q is suitable.
CAPACITORS FOR THE VCC, INPUT, AND OUTPUT PINS
Capacitors of 1 000 pF are recommendable as the bypass capacitor for the VCC pin and the coupling capacitors
for the input and output pins.
The bypass capacitor connected to the VCC pin is used to minimize ground impedance of VCC pin. So, stable bias
can be supplied against VCC fluctuation.
The coupling capacitors, connected to the input and output pins, are used to cut the DC and minimize RF serial
impedance. Their capacitance are therefore selected as lower impedance against a 50
load. The capacitors thus
perform as high pass filters, suppressing low frequencies to DC.
To obtain a flat gain from 100 MHz upwards, 1 000 pF capacitors are used in the test circuit. In the case of under
10 MHz operation, increase the value of coupling capacitor such as 10 000 pF. Because the coupling capacitors are
determined by equation, C = 1/(2 Rfc).


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