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參數(shù)資料
| 型號(hào)： | μPC2762TB |
| 廠商： | NEC Corp. |
| 英文描述： | 3 V, Minicold Silicon MMIC Medium Output Power Amplifier(中等輸出功率放大器) |
| 中文描述： | 3伏，迷你冷軋硅中等輸出功率單片放大器（中等輸出功率放大器） |
| 文件頁數(shù)： | 8/28頁 |
| 文件大?。?/td> | 171K |
| 代理商： | ΜPC2762TB |
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Data Sheet P12710EJ2V0DS00
8
μ
PC2762TB,
μ
PC2763TB,
μ
PC2771TB
TEST CIRCUIT
V
CC
1 000 pF
1 000 pF
1 000 pF
C
1
C
2
L
4
6
1
2, 3, 5
50
50
OUT
IN
C
3
COMPONENTS OF TEST CIRCUIT
FOR
MEASURING ELECTRICAL
CHARACTERISTICS
EXAMPLE OF ACTUAL APPLICATION COMPONENTS
Type
Value
Type
Value
Operating Frequency
C
1
, C
2
Bias Tee
1 000 pF
C
1
to C
3
Chip capacitor
1 000 pF
100 MHz or higher
C
3
Capacitor
1 000 pF
L
Chip inductor
100 nH
100 MHz or higher
L
Bias Tee
1 000 nH
10 nH
2.0 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.
For above reason, select an inductance of 100
or over impedance in the operating frequency. The gain is a
peak in the operating frequency band, and suppressed at lower frequencies.
The recommendable inductance can be chosen from example of actual application components list as shown
above.
CAPACITORS FOR THE V
CC
, 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
π
Rfc).
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