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參數(shù)資料
| 型號： | RF2126PCBA |
| 廠商： | RF Micro Devices, Inc. |
| 英文描述： | CAP ARRAY 12PF 50V NP0 1206 |
| 中文描述： | 大功率線性放大器 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大?。?/td> | 57K |
| 代理商： | RF2126PCBA |
2-75
RF2126
Rev A5 010207
2
P
Pin
1
Function
RF IN
Description
RF input. This input is DC coupled, so an external blocking capacitor is
required if this pin is connected to a DC path. An optimum match to
50
is obtained by providing an external series capacitor of 1.6pF and
then a shunt capacitor of 2.0pF; see the Application Schematic. Those
values are typical for 2450MHz; other values may be required for other
frequencies.
Same as pin 1.
Interface Schematic
2
3
RF IN
PC
Power control pin. For obtaining maximum performance the voltage on
this pin can be used to set correct bias level. In a typical application this
is implemented by a feedback loop. The feedback can be based on the
actual supply current of the device, i.e. maintaining a fixed current level,
or it can be based on the RF output power level to maintain a fixed RF
power level (Automatic Level Control loop). A voltage of 0.5V or lower
brings the part into power down state.
Power supply pin for the bias circuits. External low frequency bypass
capacitors should be connected if no other low frequency decoupling is
nearby.
RF output and bias for the output stage. The power supply for the out-
put transistor needs to be supplied to this pin. This can be done
through a quarter-wavelength microstrip line that is RF grounded at the
other end, or through an RF inductor that supports the required DC cur-
rents. Optimum load impedance is achieved by providing a shunt
capacitor of 1.8pF and a series capacitor of 3.3pF; see the Application
Schematic. Those values are typical for 2450MHz; other values may be
required for other frequencies. Since there are several output pins
available, which are internally connected, one pin can be used for con-
necting the bias, another for connecting a (third) harmonic trap filter,
and the other pins for the RF output.
Same as pin 5.
4
VCC
5
RF OUT
6
7
8
RF OUT
RF OUT
RF OUT
GND
Same as pin 5.
Same as pin 5.
Pkg
Base
Ground connection. The backside of the package should be connected
to the ground plane through a short path, i.e., vias under the device
may be required.
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