Maxim無線/射頻功率放大器選擇指南

　　本文概括了Maxim針對蜂窩、PCS、802.11b、無繩電話以及Bluetooth等應用提供的射頻(RF)功率放大器(PA)。列出了工作電壓、電源電流、輸出功率、封裝、功效等參數的對照表，并給出了Maxim PA IC的特點。另外，還提供了一個根據市場應用選擇的參考表。

　　更多信息請查詢：無線產品網頁

　　更多信息請查詢：快速瀏覽MAX2240數據資料

　　更多信息請查詢：快速瀏覽MAX2264/MAX2265數據資料

　　更多信息請查詢：快速瀏覽MAX2267/MAX2268/MAX2269數據資料

　　更多信息請查詢：快速瀏覽MAX2320/MAX2321/MAX2322/MAX2324/MAX2326/MAX2327數據資料

　　更多信息請查詢：快速瀏覽MAX2430數據資料

　　更多信息請查詢：快速瀏覽MAX2601/MAX2602數據資料

　　更多信息請查詢：應用技術支持

　　Maxim的RF功率放大器即可應用于線性調制，如QAM和QPSK，也可用于非線性調制，如：FM、FSK等。針對TDMA市場設計的PA在性能上有所改進，如：自動斜率控制可減小頻譜擴散，自動斜率控制有助于保持Vcc的穩定、降低VCO牽引。自動熱保護功能能夠根據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能夠在城市或遠郊CDMA環境下、對于大多數便攜終端要求的輸出功率電平提供更低的電源電流，CDMA PA在大多數時間工作在較低的輸出功率狀態。

　　對于2.4GHz ISM應用，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具有模擬或數字的功率控制、閉環功率控制、動態偏置控制、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計的RF功率放大器關鍵特性：

　　低成本，這一點得益于它較高的管芯產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

　　無需負偏置電源，不同于大多數GaAs放大器

　　在全溫范圍和負載變化范圍內提供穩定的器件特性

　　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和中心頻點進行重新調諧，與表中參數有差異。

　　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

　　0.5A 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. 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),

　　FixedorDynamic 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