Circuit Envelope Simulation: A Powerful Resource for 4G Power Amplifier Design
Designers of RF power amplifiers for 3G and 4G wireless systems face conflicting challenges unlike those they have encountered before. For example, while today’s higher-order modulation schemes require exceptional linearity throughout both transmit and receive signal paths, wireless carriers require the highest possible efficiency at the system level. Optimizing a circuit for one parameter invariably requires sacrificing performance of the other. Combine this and other unavoidable design conflicts with demands for greater instantaneous bandwidth and designers indeed have a conundrum. Achieving acceptable solutions requires not just standard timedomain and frequency-domain simulators but the unique contributions of circuit envelope simulation as well. This tool is seamlessly integrated within AWR 2011, and together with Microwave Office™ and Visual System Simulator™ (VSS) software, it can shave time from the design process while producing highperformance, manufacturable products.
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