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The Envelope Elimination and Restoration (EER) technique has attracted significant attention recently because of its high efficiency under back-off operation. Memoryless Digital Predistortor (DPD) is indispensable for an EER power amplifier (PA) because of the EER PA's strong nonlinearity due to the dynamic power supply voltage. However, performance of the memoryless DPD is significantly degraded...
Dynamic supply voltage techniques, such as an EER (Envelope Elimination and Restoration) PA (Power Amplifier), have attracted significant attention recently due to their high power efficiency under back-off operation. EER PAs generally possess strong nonlinearity compared to a conventional PAs, memoryless DPD (Digital Predistortor) is therefore indispensable for maintain signal quality. However, the...
In recent mobile communication systems, impairments in analog circuits cannot be disregarded owing to the need to achieve high performance. Errors in analog circuits consist of a distortion of a power amplifier(PA), gain and phase imbalance in a quadrature modulator(QMOD) and a quadrature demodulator(QDEMOD), dc offset, frequency offset, and so on. Because of high accuracy of compensation, many techniques...
A Doherty power amplifier (PA) module for mobile terminals with variable linearity function has been developed. The linearity of the Doherty PA module is optimized according to transmission signals by a bias switching technique. The Doherty amplifier module consists of a gain amplifier and a Doherty amplifier. One GaAs HBT for a gain amplifier and two GaAs HBTs for a Doherty amplifier are integrated...
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