No abstract

Abstract-We will demonstrate an alternative topology to greatly increase the operating bandwidth of an analog RF feedback power amplifier. A limited operating bandwidth due to the group delay mismatch of a feedback loop discouraged the use of an RF feedback technique in spite of its powerful linearization performance and great tolerance capability. By introducing a negative group delay circuit (NGDC) in the feedback loop, group delay match condition could be satisfied. With the fabricated 2-stage distributed element negative group delay circuit with a 30 MHz of bandwidth and a −9 ns of group delay for a wideband code division multiple access (WCDMA) downlink band, the proposed feedback amplifier with the proposed topology experimentally achieved an adjacent channel leakage ratio of −53.2 dBc with a cancellation bandwidth of over 50 MHz.Corresponding author: Y. Jeong (ycjeong@jbnu.ac.kr). 254Choi et al.

No abstract

No abstract

No abstract