Title :
Efficiency Enhancement Technique for Feed-Forward Amplifier Using Negative Group Delay Circuit
Author :
Yamauchi, Kazuhisa ; Noto, Hifumi ; Inoue, Akira ; Miyazaki, Moriyasu
Author_Institution :
Mitsubishi Electr. Corp. Inf. Technol. R&D Center, Kamakura
Abstract :
We present a design and an implementation of a multistage negative group delay circuit. It is small in size and has a compact circuit. Each stage of the multistage circuit is composed of three lumped resonators with resisters. To obtain the good reflection, the resonators are arranged in the pi circuit. We discuss the principle of the negative group delay circuit and apply the circuit to the feed-forward amplifier. The delay line of the distortion cancellation loop is shortened 40% by connecting the circuit to the driver stage of the error amplifier. The efficiency of the feed-forward amplifier has been improved from 9% to 12%.
Keywords :
delay circuits; feedforward amplifiers; resonators; distortion cancellation loop; feedforward amplifier; multistage negative group delay circuit; three lumped resonators; Delay lines; Driver circuits; Feedforward systems; Information technology; Joining processes; RLC circuits; Reflection; Research and development; Resonance; Resonant frequency;
Conference_Titel :
Antenna Technology: Small Antennas and Novel Metamaterials, 2008. iWAT 2008. International Workshop on
Conference_Location :
Chiba
Print_ISBN :
978-1-4244-1522-9
DOI :
10.1109/IWAT.2008.4511308
