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參數(shù)資料
| 型號： | RF2307PCBA |
| 廠商： | RF Micro Devices, Inc. |
| 英文描述： | GENERAL PURPOSE AMPLIFIER |
| 中文描述： | 通用放大器 |
| 文件頁數(shù)： | 3/4頁 |
| 文件大?。?/td> | 59K |
| 代理商： | RF2307PCBA |
4-69
RF2307
Rev B2 010228
4
G
A
Applic ation S chematic
Pin
1
Function
RF IN
Description
RF input pin. This pin is NOT internally DC blocked. A DC blocking
capacitor, suitable for the frequency of operation, should be used in
most applications. DC coupling of the input is not allowed, because this
will override the internal feedback loop and cause temperature instabil-
ity.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
Same as pin 2.
Interface Schematic
2
GND
3
4
5
6
7
8
GND
GND
GND
GND
GND
RF OUT
Same as pin 2.
Same as pin 2.
Same as pin 2.
Same as pin 2.
RF output and bias pin. Biasing is accomplished with an external series
resistor and choke inductor to V
CC
. The resistor is chosen to set the DC
current into this pin to a desired level. At room temperature, this pin will
bias itself to 3.7V as long as the current is held between 20mA and
65mA. Thus the resistor value is determined by the following equation:
V
(
----------------------------------------
=
Care should also be taken in the resistor selection to
ensure that the
current into the part never exceeds 65 mA over the planned oper-
ating temperature
. This means that a resistor between the supply and
this pin is always required, even if a supply near 3.7V is available.
Because DC is present on this pin, a DC blocking capacitor, suitable for
the frequency of operation, should be used in most applications. The
supply side of the bias network should also be well bypassed.
R
3.7
–
)
I
CC
RF OUT
RF IN
1
2
3
4
8
7
6
5
RF OUT
22 pF
22
10 nF
22 pF
47 nH
22 pF
RF IN
V
CC
= 5 V
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