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This paper presents a hybrid supply modulator (SM) with a comprehensive analysis of receiver (RX) band noise in an envelope tracking power amplifier (ET-PA). The designed SM supports both ET mode and average power tracking (APT) mode depending on the PA output power level. In the APT mode, an integrated buck-boost (BB) converter with hysteretic control generates dc supply voltage and its average switching...
Envelope tracking (ET) prolongs the battery life by modulating the supply of a power amplifier (PA) according to the signal envelope. With this emerging technology, the PA efficiency is greatly improved, whereas the supply modulator (SM) itself needs to provide efficient and accurate envelope tracking for the overall performance of the SM-PA combined system (PA module). The ET technique, meanwhile,...
An advanced class-S transmitter architecture using a tri-level envelope encoding is presented. With tri-level encoding based on a delta-sigma modulator (DSM), a coding efficiency is improved compared to the two-level case, and sampling frequency is lowered to 522.24 MHz, which leads to an enhanced system efficiency. An analog/RF interface block is designed to control the propagation delay of the envelope...
This paper presents a new power amplifier architecture incorporating a multi-level envelope delta sigma modulation (EDSM) encoder together with a dynamic bias control method to improve the overall efficiency. The proposed transmitter was developed based on a 3-level encoding process for quantizing the non-constant envelope signal. Therefore, the power amplifier is always operated under only a two-state...
This paper presents novel simulation method and possibility of class S power amplifier for LTE base station. A baseband signal with 9.7 dB Peak-to-Average Power Ratio (PAPR) is used to represent LTE signal, which is about top 12-percent of the PAPR statistics. The channel bandwidth of 10 MHz and carrier frequency of 890.88 MHz is used to represent prearranged LTE service in Korea. A Band-Pass Delta-Sigma...
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