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參數(shù)資料
| 型號： | μPC2763T |
| 廠商： | NEC Corp. |
| 英文描述： | High Frequency Amplifier for Mobile Commnication(應用于移動通信的高頻放大器) |
| 中文描述： | 高頻放大器移動Commnication（應用于移動通信的高頻放大器） |
| 文件頁數(shù)： | 4/18頁 |
| 文件大小： | 283K |
| 代理商： | ΜPC2763T |
μ
PC2762T,
μ
PC2763T
4
TEST CIRCUIT
V
CC
1 000 pF
C
3
C
1
1 000 pF
IN
50
6
4
1
2, 3, 5
1 000 pF
C
2
50
OUT
L
Components of test circuit for
measuring electrical characteristics
Example of actual application components
C
1
to C
3
L
TYPE
Chip capacitor
Chip inductor
VALUE
1 000 pF
50 nH
10 nH
OPERATING FREQUENCY
100 MHz or higher
900 MHz band
2.5 GHz band
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 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
Rfc).
C
3
L
C
1
to C
2
TYPE
Capacitor
Bias Tee
Bias Tee
VALUE
1 000 pF
1 000 nH
1 000 pF
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