ISM发射机电源电压变化的恒定发射功率

摘要：在电池供电的RF发射器，如车库门开启装置和汽车远程无钥匙进入电池水渠，发射功率通常落在。本应用笔记演示，结合高效率升压或升压，电压转换器与ISM发射机将保持恒定的发射功率超过电池电压范围内（下0.5分贝变化）。性能数据将显示，电池寿命为恒定的发射功率发射机电池电压下降，其功率下降的2倍。电压转换所产生的交流电压纹波不降低的幅度键控（ASK）数据链路的质量和不违反美国和欧洲的无线电排放标准的短程无线链路。Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>Automotive>APP5023Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>Power-SupplyCircuits>APP5023Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>WirelessandRF>APP5023Keywords:RF,ISM,transmitter,RKE,RFremotecontrol,shortrangeradioJan09,2012APPLICATIONNOTE5023ISMTransmitterHasConstantTransmitterPowerforVaryingSupplyVoltageJan09,2012Abstract:Inbattery-poweredRFtransmitterssuchasgaragedooropenersandremotekeylessentryforcars,asthebatterydrains,thetransmitpowertypicallyfalls.Thisapplicationnote