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参数资料
| 型号： | μPC2771T |
| 厂商： | NEC Corp. |
| 英文描述： | Medium-Power High-Frequency Amplifier(中等功率的高频放大器) |
| 中文描述： | 中等功率高频放大器（中等功率的高频放大器） |
| 文件页数： | 5/14页 |
| 文件大小： | 140K |
| 代理商： | ΜPC2771T |
5
μ
PC2771T
TEST CIRCUIT
Components of test circuit for
measuring electrical characteristics
Example of actual application components
(refer to page 10)
INDUCTOR FOR THE OUTPUT PIN
The internal output transistor of this IC consumes 28 mA, to output medium power. To supply current for output
transistor, connect an inductor between the V
CC
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 V
CC
pin and the coupling capacitors
for the input and output pins.
The bypass capacitor connected to the V
CC
pin is used to minimize ground impedance of V
CC
pin. So, stable bias
can be supplied against V
CC
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
Rf
C
).
C
1
to C
3
L
Chip capacitor
Coil
Note
1 000 pF
300 nH
C
1
to C
3
L
1 000 pF
50 nH
10 nH
100 MHz or higher
900 MHz band
1.5 GHz band
Chip capacitor
Chip inductor
TYPE
VALUE
VALUE
OPERATING FREQUENCY
TYPE
Note
20.5T, 2 mm I.D.,
φ
0.25UEW
V
CC
1 000 pF
L
C
2
50
OUT
1 000 pF
2, 3, 5
C
1
50
IN
1 000 pF
4
6
1
C
3
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