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http://dx.doi.org/10.5515/KJKIEES.2010.21.10.1143

A Research on the Bandwidth Extension of an Analog Feedback Amplifier by Using a Negative Group Delay Circuit  

Choi, Heung-Gae (IDEC Working Group, Division of Electronics and Information Engineering, Chonbuk National University)
Kim, Young-Gyu (IDEC Working Group, Division of Electronics and Information Engineering, Chonbuk National University)
Shim, Sung-Un (IDEC Working Group, Division of Electronics and Information Engineering, Chonbuk National University)
Jeong, Yong-Chae (IDEC Working Group, Division of Electronics and Information Engineering, Chonbuk National University)
Kim, Chul-Dong (Sewon Teletech. Inc.)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.21, no.10, 2010 , pp. 1143-1153 More about this Journal
Abstract
In this paper, we propose an alternative method to increase the distortion cancellation bandwidth of an analog RF feedback power amplifier by using a negative group delay circuit(NGDC). A limited distortion cancellation bandwidth due to the group delay(GD) mismatch discouraged the use of feedback technique in spite of its powerful linearization performance. With the fabricated NGDC with positive phase slope over frequency, the feedback amplifier of the proposed topology experimentally achieved adjacent channel leakage ratio(ACLR) improvement of 15 dB over 50 MHz bandwidth at wideband code division multiple access(WCDMA) downlink band when tested with 2-carrier WCDMA signal. At an average output power of 28 dBm, ACLR of 25.1 dB is improved to obtain -53.2 dBc at 5 MHz offset.
Keywords
Bandwidth Enhancement; Feedback; Feedforward; Negative Group Delay Circuit;
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