出版社：The Institute of Image Information and Television Engineers
摘要：We developed a wide-band, high-efficiency, cost-effective multi-channel power amplifier (MCPA) using digital pre-distortion for digital terrestrial TV broadcasting. In this equipment, a wide-band of 50 MHz and over, is produced by using a high-speed A/D D/A converter that has a sampling frequency of 200 MHz and over. We also developed a new method that detects PA distortion by adding an RF output signal and an inverted RF input signal to reduce dynamic range and used a new algorithm that compensates for a high speed.Using these new methods, we obtained IMs of-50dB and under with multiple channel input and high efficiencies of 10.2-11.2%.
