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| 应用笔记335
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Maxim无线/射频功率放大器选择指南 |
摘要：本文概括了Maxim针对蜂窝、PCS、802.11a/b/g、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：
Maxim的RF功率放大器(PA)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) (802.11b)
+17dBm and 3%EVM (802.11g)
25% Efficiency with Linear Output Power
29dB Power Gain
On-Chip Power Detector
External Bias Control for Current Throttleback
On-Chip Input Matching
0.5µA 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
|
| MAX2840
|
2.7 to 3.6
|
120 idle
155 full
|
5150 to 5350
|
+15
|
A
|
12-UCSP-
1.52x2.02
|
6%
|
NA
|
High Linear Output Power
+15dBm at 5.25 GHz
(802.11a), 22dB Power
gain, On-chip Power
detector, Simple
input/output matching,
<10uA Shutdown current
|
| MAX2841
|
2.7 to 3.6
|
165 idle
260 full
|
5150 to 5350
|
+18
|
A
|
12-UCSP-
1.52x2.02
|
7%
|
NA
|
High Linear Output Power
+18dBm at 5.25 GHz
(802.11a), 22dB Power
gain, On-chip Power
detector, Simple
input/output matching,
<10uA Shutdown current
|
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%
|
|
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)
|
| Cellular TDM |
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
|
|
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
|
|
802.11b/g
|
MAX2247
|
High linear output power, On-chip
power detector, External DAC
controllable Bias, On-chip input
matching
|
+25dBm Output Power for 802.11b,
+17dBm output power at 3.0% EVM
for 802.11g, 29dB Power Gain
|
|
802.11a
|
MAX2840
|
High linear output power, On-chip
power detector, Simple Matching
External DAC controllable Bias
|
+15dBm Output Power at 3.9% EVN for
802.11a, 22dBm power gain
|
|
MAX2841
|
High linear output power, On-chip
power detector, Simple Matching
External DAC controllable Bias,
|
+18dBm Output Power at 3.5% EVN for
802.11a, 22dBm power gain
|
16-pin PQSOP Package Outline
16/20-pin
TSSOP-EP Package Outline
16-pin SO/QSOP
Package Outline
8-pin PSOPII
Package Outline
9-pin UCSP
Package Outline
12-pin UCSP
Package Outline
25-pin UCSP
Package Outline
| 相关型号 | |
APP 335: Aug 04, 2003
|
| MAX2240 |
2.5GHz、+20dBm功率放大器IC，UCSP封装 |
完整的数据资料
(PDF, 192kB)
|
|
| MAX2251 |
+2.8V、单电源、蜂窝频段线性功率放大器 |
完整的数据资料
(PDF, 208kB)
|
|
| MAX2264 |
2.7V、单电源、蜂窝频段线性功率放大器 |
完整的数据资料
(PDF, 232kB)
|
免费样品
|
| MAX2265 |
2.7V、单电源、蜂窝频段线性功率放大器 |
完整的数据资料
(PDF, 232kB)
|
免费样品
|
| MAX2267 |
+2.7V、单电源、蜂窝频段线性功率放大器 |
完整的数据资料
(PDF, 288kB)
|
免费样品
|
| MAX2268 |
+2.7V、单电源、蜂窝频段线性功率放大器 |
完整的数据资料
(PDF, 288kB)
|
免费样品
|
| MAX2269 |
+2.7V、单电源、蜂窝频段线性功率放大器 |
完整的数据资料
(PDF, 288kB)
|
免费样品
|
| MAX2322 |
可调、高线性度、SiGe、双频段、LNA/混频器IC |
完整的数据资料
(PDF, 436kB)
|
免费样品
|
| MAX2430 |
低电压、硅工艺RF功放前置驱动器 |
完整的数据资料
(PDF, 192kB)
|
|
| MAX2601 |
3.6V、1W RF功率晶体管，适合900MHz应用 |
完整的数据资料
(PDF, 96kB)
|
免费样品
|
| MAX2602 |
3.6V、1W RF功率晶体管，适合900MHz应用 |
完整的数据资料
(PDF, 96kB)
|
免费样品
|
|
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