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 > Design Support > App Notes > Automotive > APP 2768 Keywords: ASK receiver, tire pressure monitoring system, TPMS, low-frequency RF, LFRF, LFRF receiver Oct 01, 2003 APPLICATION NOTE 2768 Ultra-Low Quiescent Supply Current 125kHz ASK Receiver Abstract: This application note shows a simple design for a 125kHz ASK receiver for a tire pressure monitoring system (TPMS). This LFRF receiver needs only a 2.1V supply voltage and 4A (typ) supply current. The design uses a tiny comparator acting as a limiting amplifier, the MAX9075, and a transistor for detection. A nanopower comparator, the MAX9117, can be used to reduce the supply current to 600nA (typ). There is an e……