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Maxim的RF功率放大器即可應(yīng)用于線性調(diào)制，如QAM和QPSK，也可用于非線性調(diào)制，如：FM、FSK等。針對TDMA市場設(shè)計的PA在性能上有所改進(jìn)，如：自動斜率控制可減小頻譜擴(kuò)散，自動斜率控制有助于保持Vcc的穩(wěn)定、降低VCO牽引。自動熱保護(hù)功能能夠根據(jù)需要臨時減小輸出功率，提供一個堅固、耐用的PA。針對CDMA市場推出的PA能夠在城市或遠(yuǎn)郊CDMA環(huán)境下、對于大多數(shù)便攜終端要求的輸出功率電平提供更低的電源電流，CDMA PA在大多數(shù)時間工作在較低的輸出功率狀態(tài)。

對于2.4GHz ISM應(yīng)用，如：802.11b WLAN、Bluetooth、HomeRF及無繩電話，Maxim可提供低成本、超小尺寸(如UCSP封裝)的功率放大器，這些PA具有模擬或數(shù)字的功率控制、閉環(huán)功率控制、動態(tài)偏置控制、集成檢測器等，并具有較高的效率。

以下列出了采用硅雙極型工藝設(shè)計的RF功率放大器關(guān)鍵特性：

低成本，這一點(diǎn)得益于它較高的管芯產(chǎn)量和簡單的器件制作工藝(與超外差器件相比)
小尺寸，采用UCSP封裝和較少的外部元件
無需負(fù)偏置電源，不同于大多數(shù)GaAs放大器
在全溫范圍和負(fù)載變化范圍內(nèi)提供穩(wěn)定的器件特性
自動斜率控制
下表列出了我們的一些功率放大器及其性能，注意，有幾款PA需要在指定的性能參數(shù)和中心頻點(diǎn)進(jìn)行重新調(diào)諧，與表中參數(shù)有差異。

表1. 選擇指南: 型號列表

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
0.5µA 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 
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. 針對市場選擇

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 

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 USCP Package Outline

12-pin USCP Package Outline