參數(shù)資料
型號(hào)： P12152EJ3V0AN00
英文描述： uPC1678G/1678GV/1679G. uPC2708T to 2710T. uPC2762T/2763T. uPC2771T/2776T Silicon Medium-Power High-Frequency Amplifier MMIC
中文描述： uPC1678G/1678GV/1679G。 uPC2708T到2710T。 uPC2762T/2763T。 uPC2771T/2776T硅中功率高頻單片放大器
文件頁(yè)數(shù)： 13/35頁(yè)
文件大?。?/td> 291K
代理商： P12152EJ3V0AN00
Application Note P12152EJ3V0AN00
13
P
PC2776
IN
V
CC
OUT
GND
GND
<6>
<1>
<3>
<2>
<5>
<4>
3.2 External Circuit Description
The ICs in this series are designed to supply large current for an internal output stage transistor to obtain higher
output. Therefore, RF characteristics are guaranteed by connecting an external element that offers no resistance to
DC current and has high impedance in the high-frequency range. Bias-tee type test circuits are most commonly used
to simplify testing and obtain reproducibility.
In actual use, you should externally connect an inductor between the output pin and V
CC
pin. By using the
external inductor, output port can keep the applied voltage and the impedance at used frequency without dropping
both parameters. In addition, by using a wire-wound inductor with a self-resonance frequency close to the used
frequency, the return loss on the output side may be improved.
For the electrical characteristics test circuit, a bias-tee of approximately 1000nH is used so that high impedance is
maintained even in low frequency. If the impedance in the used frequency or above is kept high, the required gain
can be obtained even if the inductance value is small. Therefore, the used frequency is allowed to be higher than the
self-resonance frequency.
The following shows a calculation example for the used frequency f and inductance value L.
Z
inductor
= 2
S
fL
1
1
Z
L
=
=
1
1
1
1
+
+
Z
next
Z
inductor
Z
next
2
S
fL
Here, the gain is rapidly decreased at the frequency where the Z
inductor
is smaller than the next stage impedance
Z
next
(50
:
for example), and a large gain is obtained at the frequency where the Z
inductor
is larger than the next stage
impedance. Accordingly, the relation between the used frequency and the minimum required inductor is as follows.
2
S
L > 50 (when Z
next
= 50
:
)
For example, the calculation of L such that L > 8 nH produces f > 1 GHz. Therefore, to obtain a flat gain for 1 GHz
or higher, the inductance value must be larger than 8 nH.
Because band is limited by the input/output DC cut capacitor value, determine the capacitance value C based on
the following calculation.
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