Title :
Negative Group Delay Circuit for Feed-Forward Amplifier
Author :
Noto, Hifumi ; Yamauchi, Kazuhisa ; Nakayama, Masatoshi ; Isota, Yoji
Author_Institution :
Mitsubishi Electr. Corp., Kamakura
Abstract :
We present a design and an implementation of a negative group delay circuit, which consists of lumped parameter element. It is very small and simple circuit. The circuit is composed of three resonators with resisters, which are arranged to pi type circuit to improve the reflection. We discuss the principle of a negative group delay circuit and apply the circuit to the feed-forward amplifier. It is confirmed that 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; lumped parameter networks; resonators; delay line; distortion cancellation loop; efficiency 12 percent; error amplifier; feed-forward amplifier; lumped parameter element; negative group delay circuit; resonator; Delay lines; Driver circuits; Feedforward systems; Information technology; Joining processes; Metamaterials; RLC circuits; Reflection; Resonance; Resonant frequency; delay line; feed-forward amplifier; metamaterials; negative group delay;
Conference_Titel :
Microwave Symposium, 2007. IEEE/MTT-S International
Conference_Location :
Honolulu, HI
Print_ISBN :
1-4244-0688-9
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2007.380286
