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參數(shù)資料
| 型號： | MAX2247 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 2.4GHz SiGe Linear Power Amplifier |
| 中文描述： | 2.4GHz SiGe線性功率放大器 |
| 文件頁數(shù)： | 8/10頁 |
| 文件大小： | 770K |
| 代理商： | MAX2247 |
M
Applications Information
The MAX2247 is a three-stage amplifier that requires
special attention to board layout and grounding for
optimum output power, gain, efficiency, and side-lobe
suppression. For ease of implementation, the MAX2247
evaluation (EV) kit layout should be used as a model.
Gerber files are available from Maxim upon request.
Follow the recommendations below to optimize perfor-
mance when adapting the layout to your board.
Interstage Matching and Bypassing
V
CC
1 and V
CC
2 provide DC bias to the open-collector
outputs of the first- and second-stage amplifiers and
are also part of the interstage matching networks
required to optimize performance among the three
amplifier stages. The MAX2247 must have a small
amount of inductance on the V
CC
lines in addition to
the inductance already provided on-chip. See the
Typical Application Circuit
for the lumped and discrete
component values used on the MAX2247 EV kit for opti-
mum interstage matching and RF bypassing.
In addition to RF bypass capacitors on each bias line, a
global bypass capacitor of 4.7μF is necessary to filter
any noise on the supply line. Route separate V
CC
bias
paths from the global bypass capacitor (using a star
topology) to avoid coupling between PA stages. Use
the MAX2247 EV kit PC board layout as a guide.
Input Matching
The MAX2247 includes internal input matching to 50
, so
no external matching network is required. A DC-blocking
capacitor is required at the input to the device.
Output Matching
The RF_OUT port is an open-collector output that must be
pulled to V
CC
through an RF choke for proper biasing (see
the
Typical Operating Circuit
). A shunt 22pF capacitor to
ground is required at the supply side of the inductor. In
addition, a matching network is required for optimum gain,
efficiency, ACPR, and output power. The EV kit should
serve as a good starting point for your layout. However,
optimum performance is layout dependent, and some
component optimization may be required. It is important to
leave room on your board for tuning/optimization.
2.4GHz SiGe Linear Power Amplifier
8
_______________________________________________________________________________________
MAX2247
MAX2820
RF OUTPUT
CURRENT
DAC
BIAS
CIRCUIT
POWER
DETECTOR
PA DRIVER
B
ZERO-IF TRANSCEIVER
STANDARD BASEBAND/MAC IC
SHUTDOWN CONTROL
TX POWER DETECTOR
TX BASEBAND I/Q
RX BASEBAND I/Q
Figure 2. The MAX2247 Connected to the Current DAC of the MAX2820 for Bias Control
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX2247_09 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:2.4GHz SiGe Linear Power Amplifier |
| MAX2247_1 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Evaluation Kit |
| MAX2247EBC | 制造商:Rochester Electronics LLC 功能描述: |
| MAX2247EBC+T | 功能描述:射頻放大器 RoHS:否 制造商:Skyworks Solutions, Inc. 類型:Low Noise Amplifier 工作頻率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 輸出截獲點:37.5 dBm 功率增益類型:32 dB 噪聲系數(shù):0.85 dB 工作電源電壓:5 V 電源電流:125 mA 測試頻率:2.6 GHz 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 封裝:Reel |
| MAX2247EBC+TW | 功能描述:射頻放大器 RoHS:否 制造商:Skyworks Solutions, Inc. 類型:Low Noise Amplifier 工作頻率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 輸出截獲點:37.5 dBm 功率增益類型:32 dB 噪聲系數(shù):0.85 dB 工作電源電壓:5 V 電源電流:125 mA 測試頻率:2.6 GHz 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 封裝:Reel |
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