MicroNote 703 Silicon PIN Diode and GaAs MESFET Switches and Their Effects On Linearity of Digital Communications Systems
نویسنده
چکیده
The RF sections of Analog FM and Digital Radios primarily differ in the required linearity. If the transmitter amplifiers and attendant switching functions are not extremely linear, AM to AM and AM to PM conversion can cause serious deterioration of Bit Error Rate (BER) and an increase in intersymbol interference (ISI). Higher order QAM Systems such as 64-QAM and 256-QAM require even higher levels of linearity. This article discusses the linearity requirements for the RF sections of Digital Communications Links and compares the low-distortion performance of silicon PIN diode and GaAs MESFET switches.
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