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3.4GHz to 3.8GHz SiGe
Low-Noise Amplifier/PA Predriver
Detailed Description
The MAX2645 is a versatile amplifier with high-gain,
high-linearity, and low-noise performance — features that
make it suitable for use as an LNA, high-linearity/low-
noise amplifier, PA predriver, or LO buffer in the 3.4GHz
to 3.8GHz frequency range. See Figure 1, MAX2645
Typical Application Circuit , for recommended compo-
nent values. A single external bias-setting resistor allows
the system designer to trade off linearity for reduced
supply current. A logic-level control reduces gain by a
25dB step to further improve input IP3 performance. A
low-power shutdown mode disables the device and
reduces current consumption to 0.1μA.
Bias Circuitry
The linearity and supply current of the MAX2645 are
externally programmable with a single resistor (R BIAS )
placed from BIAS to GND. Larger resistor values result
in lower IP3 performance and lower supply current, while
smaller resistor values result in higher IP3 performance
and higher supply current. Use resistor values in the
15k ? to 25k ? range, with a nominal value of 20k ?
suitable for most applications. See Typical Operating
Characteristic s for performance variation vs. R BIAS
value.
Table 1. MAX2645 S-Parameters
Gain Step Control
The MAX2645 features a logic-level gain step control
input (GAIN) that places the device in high-gain or low-
gain mode. A logic-level high places the device in high-
gain mode, where the gain is 14.5dB. A logic-level low
places the device in low-gain/high-linearity mode, where
the gain is reduced to 10dB and the input IP3 perfor-
mance is increased.
Shutdown Control
The MAX2645 features a logic-level shutdown control
input. A logic high on SHDN enables the device for nor-
mal operation. A logic low on SHDN disables all device
functions and reduces supply current to 0.1μA.
Applications Information
RF Input
The RFIN port is internally biased and requires an exter-
nal DC-blocking capacitor. A matching network is
required for best performance. Figure 1 shows compo-
nent values optimized for best noise-figure performance,
low-noise figure, high-input IP3 performance, and high-
output P1dB performance in the 3.4GHz to 3.8GHz fre-
quency range. For matching to other frequencies, see
Tables 1 and 2.
FREQ
S11
S21
S12
S22
(MH z )
MAG
PHASE
MAG
PHASE
MAG
PHASE
MAG
PHASE
R BIAS = 20 k ? , V CC = +3.3V, T A = +25 ° C
3400
3450
3500
3550
3600
3650
3700
3750
3800
0.468
0.466
0.472
0.469
0.471
0.477
0.485
0.484
0.492
-149.8
-150.4
-151.6
-153.4
-154.6
-155.0
-156.6
-156.5
-157.0
5.061
4.975
5.098
4.883
4.814
5.118
4.769
4.780
4.939
-44.6
-46.3
-49.9
-53.7
-53.7
-57.4
-63.4
-62.3
-66.6
0.053
0.058
0.056
0.054
0.056
0.058
0.054
0.058
0.060
-55.5
-60.8
-64.6
-62.7
-64.4
-68.9
-70.5
-72.0
-75.4
0.660
0.658
0.661
0.658
0.647
0.657
0.657
0.654
0.654
-57.0
-58.4
-60.6
-63.0
-64.2
-66.2
-69.8
-70.9
-72.3
R BIAS = 15 k ? , V CC = +5V, T A = +25 ° C
3400
3450
3500
3550
3600
3650
3700
3750
3800
0.454
0.457
0.465
0.468
0.472
0.481
0.486
0.486
0.499
-146.6
-147.4
-147.9
-149.7
-150.5
-150.5
-152.2
-152.4
-152.6
5.350
5.245
5.375
5.165
5.066
5.386
5.040
5.019
5.207
-41.8
-43.5
-46.6
-50.3
-50.2
-53.4
-59.4
-58.3
-62.0
0.057
0.061
0.060
0.057
0.060
0.063
0.060
0.062
0.065
-51.3
-56.7
-61.2
-61.0
-62.7
-67.6
-67.8
-67.0
-73.3
0.651
0.646
0.654
0.652
0.645
0.652
0.648
0.642
0.643
-52.3
-53.7
-55.6
-58.3
-59.3
-60.7
-63.9
-64.8
-66.2
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MAX2648EBT-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
MAX2648EBT-T10 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
MAX2648EVKIT 功能描述:放大器 IC 开发工具 RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V
MAX2648PCB 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
MAX2649CCM 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX2649EBT 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX2649EBT-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