采用BLV904晶体管、适用于935MHz至960MHz的5W AB级放大器APPLICATION NOTE5 W Class-AB Amplifier with the BLV904 for 935 960 MHzAN98019Philips Semiconductors5 W Class-AB Amplier with the BLV904 for 935 960 MHzINTRODUCTIONApplication Note AN98019This application note contains information on a 5 W class-AB amplifier based on the SMD transistor BLV904. The amplifier described can be used for driver stages in cellular radio base stations in the GSM band 935 960 MHz. The next chapters contain information on the transistor, the amplifier construction and the typical RF performance obtained. TRANSISTOR BACKGROUND The BLV904 is an NPN bipolar RF power transistor in an 8-lead SMD package called SOT409. The package contains an Aluminium Nitride (AIN) substrate to enhance its thermal performance. The bottom surface is fully metallized to ena……
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