科研之友
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摘要
This article introduces a new architecture for a high-efficiency linear transmitter using a pulse modulated envelope signal. Die transmitter employs multilevel PWM to represent the baseband signal. BY using multilevel PWM, the efficiency of the power amplifier can be improved compared with that using the conventional PWM. To demonstrate the validity of the proposed architecture, a transmitter using three-level PWM is implemented and tested with the CDMA IS-95A signal. The measured PAE, including isolator and filter loss, is 37.6% at 21.6 dBm average output power and the linearity requirements are satisfied.
- 出版日期2009-8
