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參數(shù)資料
| 型號(hào)： | RF2302 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 衰減器 |
| 英文描述： | BROADBAND LINEAR VARIABLE GAIN AMPLIFIER |
| 中文描述： | 100 MHz - 2000 MHz RF/MICROWAVE WIDE BAND LOW POWER AMPLIFIER |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁(yè)數(shù)： | 3/8頁(yè) |
| 文件大?。?/td> | 164K |
| 代理商： | RF2302 |
4-45
RF2302
Rev A8 010410
4
G
A
SeeUpgradedProductRF2376
Evaluation Board Schematic - 836MHz or 1900 MHz
(Download Bill of Materials from www.rfmd.com.)
Pin
1
2
Function
RF IN
VCC
Description
RF input pin. This pin is DC coupled and requires a blocking capacitor.
Interface Schematic
Power supply. This pin is connected to a battery or a regulated supply
and requires a bypass capacitor as close to the pin as possible.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance. Use a separate ground via
for this pin.
Analog gain control pin. This pin controls the gain of the IC. Minimum
gain occurs at V
GC
<1V and maximum gain is achieved with V
GC
=2.2V.
25dB of linear gain control with no variation of input P
1dB
is available,
and additional attenuation is possible with V
GC
<1V with input P
1dB
variation. Bypass this pin near the device.
Same as pin 3.
3
GND
4
GND
5
GC
6
7
GND
RF OUT
RF output pin. This pin is DC coupled and requires V
CC
through a bias
inductor sized accordingly to provide a high pass transformation with a
series capacitor. This LC transformation sets the output load line for the
amplifier. If this amplifier is driving a power amplifier or antenna, no
additional matching is required. However, to improve the output match,
a parallel resistor can be added across the inductor. For 836MHz appli-
cations use a 10nH bias inductor (optional resistor R3=100 ohms) and
2.7pF coupling capacitor. For 1900MHz applications use a 2.7nH bias
inductor (optional resistor R3=150ohms) and 1.0pF coupling capacitor.
Power down pin. This pin provides bias for the amplifier. To turn the
amplifier on, this pin should be at 2.8V. Reducing this voltage below
0.5V ensures that the amplifier will draw less than 10
μ
A current from
the supply. Additionally, bias current can be optimized for lower output
power by adjusting this voltage over a 2.7V to 2.9V range from a regu-
lated supply.
8
PD
1
4
8
5
L1
C4
C1
22 pF
C11
C14
1
μ
F
GC
PD
R3
C3
1 nF
C13
1
μ
C9
15 pF
C6
C12
1
μ
F
P1-1
P1-3
P1
GND
GC
1
VCC
P1-1
P1-3
P2
GND
PD
1
VCC
L (836 MHz)
H (1900 MHz)
Board
R3 (
)
C6 (pF)
C4 (pF)
L1 (nH)
12
3.3
100
150
10
2.7
2.7
1
VCC
50
μ
strip
RF IN
J1
50
μ
strip
RF OUT
J2
VCC
2302400-, 401-
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