超低静态电流供应的125kHz ASK接收器

摘要：本应用笔记显示了一个简单的设计为125kHz的要求轮胎压力监测系统（TPMS）的接收器。这LFRF接收器，只需要一个2.1V的电源电压和4μA（典型值）电源电流。本设计采用了一个小小的比较，作为限幅放大器的MAX9075和检测的晶体管。一个纳安级比较的MAX9117，可用于降低供电电流为600nA（典型值）。Maxim>DesignSupport>AppNotes>Automotive>APP2768Keywords:ASKreceiver,tirepressuremonitoringsystem,TPMS,low-frequencyRF,LFRF,LFRFreceiverOct01,2003APPLICATIONNOTE2768Ultra-LowQuiescentSupplyCurrent125kHzASKReceiverAbstract:Thisapplicationnoteshowsasimpledesignfora125kHzASKreceiverforatirepressuremonitoringsystem(TPMS).ThisLFRFreceiverneedsonlya2.1Vsupplyvoltageand4A(typ)supplycurrent.Thedesignusesatinycomparatoractingasalimitingamplifier,theMAX9075,andatransistorfordetection.Ananopowercomparator,theMAX9117,canbeusedtoreducethesupplycurrentto600nA(typ).Thereisane