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In this paper, digital pre-distorter based on the memory polynomial model is utilized to compensate the nonlinearity of the Multi-Carrier TD-SCDMA RF power amplifiers (RFPA). Three-carrier TD-SCDMA signals with three different sub-frame configurations are used as test signals, a 47-dBm peak-envelope-power LDMOS power amplifier is designed to validate the performance of the pre-distorter. The digital...
In Time Division Duplex(TDD) system, the radio frequency (RF) power amplifier in a repeater is turned on only when it receives RF signal, thus implementing the sub-frame synchronization and the second conversion point of timeslots is important in TDD system. This paper introduce a bias circuit design to realize the control of the RF power amplifier in the down-link through envelop detection of the...
This paper presents a design approach for high efficiency RF power amplifiers with dynamic biases for TDSCDMA systems. The design principle of a PA with dynamic bias is described in detail. The improvement of the power-added efficiency (PAE) is achieved by the drain bias control technique according to the variation of the input power. The simulation results illustrated that this PA can achieve high...
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