Re-configurable impedance matching and harmonic filter system

摘要

Methods and apparatus are provided to enable a transceiver ( 200 ) or transmitter including a single PA line-up ( 210 ) to transmit signals having frequencies in two or more different frequency bands, and/or having two or more different modulation types, and/or having two or more different RF power levels. The single PA line-up includes at least one variable matching circuit ( 216 ) and a variable harmonic filter ( 240 ) to tune match and tune filter communication signals prior to transmission. The variable matching circuit and the variable harmonic filter each include at least one variable capacitive element ( 2160 and 2400 ) that switches ON/OFF depending on whether a low frequency signal or a high frequency signal is being transmitted. Each variable capacitive element includes separate direct current and radio frequency terminals to enable the single PA line-up to change signal modulation and/or RF power levels in addition to frequencies.