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2.7V, Single-Supply, Cellular-Band
Linear Power Amplifiers
ence, so the current out of this pin is inversely propor-
tional to the value of the resistor between this pin and
ground. Similarly, the bias current of the first stage in
high-power mode is proportional to the current flowing
out of BIAS1H. The current in the second stage is pro-
portional to the currents out of BIAS2L and BIAS2H for
low- and high-power modes, respectively.
Additionally, these resistors allow for customization of
gain and alternate- and adjacent-channel power ratios.
Increasing the bias current in the first stage increases
the gain and improves alternate-channel power ratio at
the expense of efficiency. Increasing the bias current in
the second stage increases gain at the expense of effi-
ciency as well as adjacent- and alternate-channel power
ratios.
The PA bias current can be dynamically adjusted by
summing a current into the bias pin of interest with an
external source such as a DAC. See the MAX2265
Typical Application Circuit for using a voltage DAC and
current setting resistors RTB1 and RTB2. Choosing
RTB1 = R1 and RTB2 = R2 allows current adjustment
between 0mA to double the nominal idle current with
DAC voltages between 0V and 2.4V. The DAC must be
able to source approximately 100μA.
Shutdown Mode
Pull pins 2 and 6 low to place the MAX2264/MAX2265/
MAX2266 into shutdown mode. In this mode, all gain
stages are disabled and supply current drops to 0.5μA.
Increasing Efficiency Further
The MAX2266 incorporates an additional external
switch to increase efficiency to 17% at +16dBm and to
32% at +28dBm. This efficiency increase is mainly due
to the additional isolation between the high- and low-
power outputs provided by the external switch.
Applications Information
External Components
The MAX2264/MAX2265/MAX2266 require matching
circuits at their inputs and outputs for operation in a
50 ? system. The application circuits in Figures 1, 2,
and 3 describe the topology of the matching circuits for
RFIN
C2
L1
C1
L2
MAX2264
L3
PWR
1
16
RH2
C3
C11
2
15
V CC
3
14
V CC
C12 V CC
SHDN
RH1
4
5
6
13
12
11
C13
OPTIONAL NOISE-REDUCTION CIRCUIT
L6
C6
7
10
V CC
RL2
8
9
RL1
L5
C5
V CC
C4
L4
C9
C8
C7
RFOUT
Figure 1. MAX2264 Typical Application Circuit
12
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相关代理商/技术参数
MAX2266 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Evaluation Kit for the MAX2406[MAX2406EVKIT ]
MAX2266EUE 功能描述:射频放大器 RoHS:否 制造商:Skyworks Solutions, Inc. 类型:Low Noise Amplifier 工作频率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 输出截获点:37.5 dBm 功率增益类型:32 dB 噪声系数:0.85 dB 工作电源电压:5 V 电源电流:125 mA 测试频率:2.6 GHz 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-16 封装:Reel
MAX2266EUE+T 功能描述:射频放大器 RoHS:否 制造商:Skyworks Solutions, Inc. 类型:Low Noise Amplifier 工作频率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 输出截获点:37.5 dBm 功率增益类型:32 dB 噪声系数:0.85 dB 工作电源电压:5 V 电源电流:125 mA 测试频率:2.6 GHz 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-16 封装:Reel
MAX2266EUE-T 功能描述:射频放大器 RoHS:否 制造商:Skyworks Solutions, Inc. 类型:Low Noise Amplifier 工作频率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 输出截获点:37.5 dBm 功率增益类型:32 dB 噪声系数:0.85 dB 工作电源电压:5 V 电源电流:125 mA 测试频率:2.6 GHz 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-16 封装:Reel
MAX2266EVKIT 功能描述:射频放大器 RoHS:否 制造商:Skyworks Solutions, Inc. 类型:Low Noise Amplifier 工作频率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 输出截获点:37.5 dBm 功率增益类型:32 dB 噪声系数:0.85 dB 工作电源电压:5 V 电源电流:125 mA 测试频率:2.6 GHz 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-16 封装:Reel
MAX2267 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:+2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers
MAX2267E/D 功能描述:射频放大器 RoHS:否 制造商:Skyworks Solutions, Inc. 类型:Low Noise Amplifier 工作频率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 输出截获点:37.5 dBm 功率增益类型:32 dB 噪声系数:0.85 dB 工作电源电压:5 V 电源电流:125 mA 测试频率:2.6 GHz 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-16 封装:Reel
MAX2267EUE 功能描述:射频放大器 RoHS:否 制造商:Skyworks Solutions, Inc. 类型:Low Noise Amplifier 工作频率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 输出截获点:37.5 dBm 功率增益类型:32 dB 噪声系数:0.85 dB 工作电源电压:5 V 电源电流:125 mA 测试频率:2.6 GHz 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-16 封装:Reel