6.1 General Considerations Figure 6.1.Role of mixers in a generic transceiver. LNA Downconversion Mixer IF/Baseband Port F Port LO Port Duplexer LO PA RF LO Port Port IF/Baseband Upconversion Port Mixer Figure 6.2.(a)Mixer using an ideal switch,(b)input and output spectra. V.o RF 3010 C> 00L0 0A-30L000RP-L0 (a) (b时6.1 General Considerations