Maxim无线/射频功率放大器选择指南

本文概括了Maxim针对蜂窝、PCS、802.11b、无绳电话以及Bluetooth等应用提供的射频(RF)功率放大器(PA)。列出了工作电压、电源电流、输出功率、封装、功效等参数的对照表，并给出了Maxim PA IC的特点。另外，还提供了一个根据市场应用选择的参考表。

更多信息请查询：无线产品网页

更多信息请查询：快速浏览MAX2240数据资料

更多信息请查询：快速浏览MAX2264/MAX2265数据资料

更多信息请查询：快速浏览MAX2267/MAX2268/MAX2269数据资料

更多信息请查询：快速浏览MAX2320/MAX2321/MAX2322/MAX2324/MAX2326/MAX2327数据资料

更多信息请查询：快速浏览MAX2430数据资料

更多信息请查询：快速浏览MAX2601/MAX2602数据资料

更多信息请查询：应用技术支持

Maxim的RF功率放大器即可应用于线性调制，如QAM和QPSK，也可用于非线性调制，如：FM、FSK等。针对TDMA市场设计的PA在性能上有所改进，如：自动斜率控制可减小频谱扩散，自动斜率控制有助于保持Vcc的稳定、降低VCO牵引。自动热保护功能能够根据需要临时减小输出功率，提供一个坚固、耐用的PA。针对CDMA市场推出的PA能够在城市或远郊CDMA环境下、对于大多数便携终端要求的输出功率电平提供更低的电源电流，CDMA PA在大多数时间工作在较低的输出功率状态。

对于2.4GHz ISM应用，如：802.11b WLAN、Bluetooth、HomeRF及无绳电话，Maxim可提供低成本、超小尺寸(如UCSP封装)的功率放大器，这些PA具有模拟或数字的功率控制、闭环功率控制、动态偏置控制、集成检测器等，并具有较高的效率。

以下列出了采用硅双极型工艺设计的RF功率放大器关键特性：

低成本，这一点得益于它较高的管芯产量和简单的器件制作工艺(与超外差器件相比)

小尺寸，采用UCSP封装和较少的外部元件

无需负偏置电源，不同于大多数GaAs放大器

在全温范围和负载变化范围内提供稳定的器件特性

自动斜率控制

下表列出了我们的一些功率放大器及其性能，注意，有几款PA需要在指定的性能参数和中心频点进行重新调谐，与表中参数有差异。

表1. 选择指南: 型号列表

Part Vcc

(V)

Icc

(mA)

Frequency

(MHz)

Pout

(dBm)

Class Package PAE

(full)

PAE

(derated)

Features

MAX2235 2.7 to 5.5 20 idle

610 full

800 to 1000 +30.3 C 20-Pin

TSSOP-EP

47% 22%

+24dBm

Analog Gain Control, Auto Power Ramp, Shutdown

MAX2430 3.0 to 5.5 52 800 to 1000 +21.4 AB 16-Pin

SO/QSOP

24% NA Power Control, Shutdown, Drives MAX2601/02

MAX2601 2.7 to 5.5 450 DC to 1000 +30.0 AB/C 8-Pin

PSOPII

54% 18%

+20dBm

Power Transistor

MAX2602 2.7 to 5.5 450 DC to 1000 +30.0 AB/C 8-Pin

PSOPII

54% 18%

+20dBm

Power Transistor with On-Chip Bias Diode, Power Ramp, Shutdown

MAX2264 2.7 to 5.0 34 idle,

58 avg,

95 full

824 to 849 +28.0 AB 16-Pin

TSSOP-EP

32% 12%

+16dBm

IS-98 CDMA U.S., Internal Switch,

Smallest, Most Economical Solution

MAX2265 2.7 to 5.0 83 full 824 to 849 +28.0 AB 16-Pin

TSSOP-EP

37% 7%

+16dBm

IS-98 CDMA U.S., TDMA PAE = 40% at +30dBm

MAX2266 2.7 to 5.0 34 idle,

52 avg,

100 full

824 to 849 +28.0 AB 16-Pin

TSSOP-EP

32% 17%

+16dBm

IS-98 CDMA U.S., Off-Chip Switch, Lowest Current

MAX2267 2.7 to 4.5 34 idle,

56 avg,

95 full

887 to 925 +27.0 AB 16-Pin

TSSOP-EP

28% 12%

+17dBm

IS-98 CDMA Japan, Internal Switch,

Smallest, Most Economical Solution

MAX2268 2.7 to 4.5 90 idle 887 to 925 +27.0 AB 16-Pin

TSSOP-EP

34% 7%

+13.6dBm

IS-98 CDMA Japan, PDC PAE = 41% at +29dBm

MAX2269 2.7 to 4.5 34 idle,

50 avg,

100 full

887 to 925 +27.0 AB 16-Pin

TSSOP-EP

29% 17%

+17dBm

IS-98 CDMA Japan, Off-Chip Switch, Lowest Current

MAX2240 2.7 to 5.0 65 idle

105 full

2400 to 2500 +20 AB UCSP

3x3

30% NA Bluetooth PA with Digital Power Control, Shutdown

MAX2242 2.7 to 3.6 280 idle

300 full

2400 to 2500 +22.5 AB UCSP

3x4

17%

Pin=

-7dBm

315mA

6.7%

+13dBm

+22.5dBm Output Power at -33dBc ACPR for 802.11b

28.5dB Power Gain

External Bias Control for Current Throttleback

On-Chip Power Detector

Output Power Tunable from +10dBm to +22dBm

MAX2244 3.0 to 3.6 65 idle

172 full

2400 to 2500 +22 AB UCSP

3x3

34.2% NA Integrated Input Match

Internal Bandwidth-Limited Power Ramping

Power Control Range: 0.5V to 2.0V

Supply Current = 170mA at +22dBm

MAX2245 3.0 to 3.6 65 idle

179 full

2400 to 2500 +22 AB UCSP

3x3

29.2% NA Integrated Input Match

Internal Bandwidth-Limited Power Ramping

Power Control Range: 0.9V to 2.0V

Supply Current = 170mA at +22dBm

MAX2246 3.0 to 3.6 42 idle

118 full

2400 to 2500 +20 AB UCSP

3x3

27.8% NA Integrated Input Match

Internal Bandwidth-Limited Power Ramping

Power Control Range: 0.5V to 2.0V

MAX2247 2.7 to 3.6 293 idle

390 full

2400 to 2500 +25 AB UCSP

3x4

24.5% 21%

+22.5dBm

High Linear Output Power: +25dBm with <-33dBc ACPR

(1st side lobe) and <-55dBc ACPR (2nd side lobe)

25% Efficiency with Linear Output Power

29dB Power Gain

On-Chip Power Detector

External Bias Control for Current Throttleback

On-Chip Input Matching

0.5A Shutdown Mode

MAX2251 2.8 to 4.5 205 idle

1029 full

824 to 849 +32.4

AMPS

+30

TDMA

AB UCSP

3x4

51%

AMPS

41%

TDMA

38%

+30dBm

AMPS

Gain: 28dB

Integrated Power Detector

Low-Power Shutdown Mode

PAE: 41% at +30dBm for TDMA

PAE: 51% at +32.4dBm for AMPS

MAX2281 2.7 to 4.2 35 idle

731 full

824 to 849 +29 AB UCSP

5x5

+31% 14%

+16dBm

PAE: 14% at +16dBm Output Power for CDMA

PAE: 31% at +29dBm Output Power for CDMA

PAE: 40% at +31.5dBm Output Power for AMPS

PAE: 43% at +30.5dBm Output Power for TDMA

Shutdown Mode

MAX2282 2.7 to 4.2 35 idle

471 full

887 to 925 +27.5 AB UCSP

5x5

34% 17%

+18dBm

PAE: 17% at +18dBm Output Power for JCDMA

PAE: 34% at +27.5dBm Output Power for JCDMA

23dB Low-Power Mode Gain

28dB High-Power Mode Gain

Shutdown Mode

MAX2291 2.7 to 4.2 30 idle

629 full

1850 to 1910 +29 AB UCSP

5x5

36% 10%

+15dBm

High-Power Path Gain: 27dB

Low-Power Path Gain: 15dB

N-CDMA PAE: 36% at +28dBm

Shutdown Mode

TDMA PAE: 42% at +30.5dBm

W-CDMA PAE: 37% at +28dBm

表2. 针对市场选择

Market Part Advantages Specs

Cellular CDMA (U.S.) MAX2265 Low-cost, Simple Layout, Few External Components,

High-peak Efficiency

Efficiency = 37% (ACPR = -45)

Efficiency = 35% (ACPR = -48)

MAX2264

MAX2266

Low-cost, World''s Lowest Talk Current Talk Current=55mA

16dBm Efficiency =12/18% (2264/66)

Peak Efficiency =32%

MAX2281 Small Size Ultra-chip Scale Package

(2.5mm x 2.5mm),

Fixed or Dynamic Biasing

PAE: 14% at +16dBm Output Power for CDMA

PAE: 31% at +29dBm Output Power for CDMA

PAE: 40% at +31.5dBm Output Power for AMPS

PAE: 43% at +30.5dBm Output Power for TDMA

MAX2251 Small Size Ultra-chip Scale Package

(2.06mm x 2.06mm),

Integrated Power Detector,

Low-power Shutdown Mode

Gain: 28dB

PAE: 41% at +30dBm for TDMA

PAE: 51% at +32.4dBm for AMPS

CDMA (Japan) MAX2268 Low-cost, Simple Layout, Few External Components,

High-peak Efficiency

Efficiency = 37% (ACPR = -45)

Efficiency = 35% (ACPR = -48)

MAX2267

MAX2269

Low-cost, World''s Lowest Talk Current Talk Current=55mA

16dBm Efficiency =12/18% (2264/66 and ACPR=-45)

Peak Efficiency =33% (ACPR=-45)

MAX2282 Small Size Ultra-chip Scale Package

(2.5mm x 2.5mm)

PAE: 17% at +18dBm Output Power for JCDMA

PAE: 34% at +27.5dBm Output Power for JCDMA

23dB Low-Power Mode Gain

28dB High-Power Mode Gain

PCS CDMA MAX2291 Small Size Ultra-chip Scale Package

(2.5mm x 2.5mm), Shutdown

High-Power Path Gain: 27dB

Low-Power Path Gain: 15dB

N-CDMA PAE: 36% at +28dBm

TDMA PAE: 42% at +30.5dBm

W-CDMA PAE: 37% at +28dBm

Cellular TDMA MAX2281 Shutdown Mode PAE: 14% at +16dBm Output Power for CDMA

PAE: 31% at +29dBm Output Power for CDMA

PAE: 40% at +31.5dBm Output Power for AMPS

PAE: 43% at +30.5dBm Output Power for TDMA

MAX2251 Small Size Ultra-chip Scale Package

(2.06mm x 2.06mm),

Integrated Power Detector,

Low-power Shutdown Mode

Gain: 28dB

PAE: 41% at +30dBm for TDMA

PCS TDMA MAX2291 Small Size Ultra-chip Scale Package

(2.5mm x 2.5mm), Shutdown

High-Power Path Gain: 27dB

Low-Power Path Gain: 15dB

N-CDMA PAE: 36% at +28dBm

TDMA PAE: 42% at +30.5dBm

W-CDMA PAE: 37% at +28dBm

PDC MAX2265 Low-cost, Simple Layout, Few External Components,

High-peak Efficiency

Efficiency=40% (ACPR=-28)

Pout=30dBm

AMPs MAX2251 Small Size Ultra-chip Scale Package

(2.06mm x 2.06mm),

Integrated Power Detector,

Low-power Shutdown Mode

Efficiency=51%

Pout=32.4dBm

MAX2265 Low-cost, Simple Layout, Few External Components,

High-peak Efficiency

PAE: 48% at +31.5dBm Output Power for AMPS

WLL MAX2265 Low-cost, Simple Layout, Few External Components,

High-peak Efficiency

Efficiency=37% (ACPR=-45)

Efficiency=35% (ACPR=-48)

900MHz ISM MAX2235 Analog Gain Control, Auto Power Ramp, Shutdown PAE: 47% at +30.3dBm Output Power

MAX2251 Small Size Ultra-chip Scale Package

(2.06mm x 2.06mm),

Integrated Power Detector,

Low-power Shutdown Mode

Gain: 28dB

PAE: 41% at +30dBm for TDMA

PAE: 51% at +32.4dBm for AMPS

Bluetooth

HomeRF

2.4GHz DECT

MAX2240 Small Size Ultra-chip Scale Package

(1.56mm x 1.56mm),

2-bit Digital Power Control

+20dBm, Efficiency =30%

MAX2244 Closed-loop Analog Power Control,

Small Size Ultra-chip Scale Package

(1.56mm x 1.56mm)

+22dBm, Efficiency = 34.2%

Power control range 0.5V to 2V

MAX2245 Closed-loop Analog Power Control,

Small Size Ultra-chip Scale Package

(1.56mm x 1.56mm)

+22dBm, Efficiency = 29.2%

Power control range 0.9V to 2V

MAX2246 Closed-loop Analog Power Control,

Small Size Ultra-chip Scale Package

(1.56mm x 1.56mm)

+20dBm, Efficiency = 27.8%

Power control range 0.5V to 2V

Cellular TDMA/AMPS

Dual Mode

MAX2251 Small Size Ultra-chip Scale Package

(2.06mm x 2.06mm),

Integrated Power Detector,

Low-power Shutdown Mode

Gain: 28dB

PAE: 41% at +30dBm for TDMA

PAE: 51% at +32.4dBm for AMPS

802.11b WLAN MAX2242 Integrated Power Detector,

Dynamic Bias Control,

Output Power Tunable from +10dBm to +22dBm

+22.5dBm Output Power at -33dBc ACPR for 802.11B

28.5dB Power Gain