Open AccessK‐band frequency‐selective limiter using an injection locked oscillator for blocker cancellation
Author(s) -
Choi K.,
Jung J.,
Park H.,
Seo T.,
Jeong J.,
Kwon Y.
Publication year - 2018
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2017.3396
Subject(s) - limiter , injection locking , materials science , electronic engineering , physics , computer science , telecommunications , optics , engineering , laser
A frequency‐selective limiter (FSL) using an injection locked oscillator (ILO) is proposed for a blocker cancellation, which employs an ILO in the feedforward path as a high‐ Q notch filter to select and amplify the blocker from the input signal. The ILO also functions as a phase shifter providing a proper phase delay so that two blockers in the feedforward and thru paths cancel each other out in the combining node. The proposed FSL is fabricated in a commercial 0.15 μm GaAs pHEMT process with a maximum blocker suppression of 27 dB in the 50 MHz spacing two‐tone measurement at the K‐band. Thus, it provides a blocker suppression higher than 20 dB over the 250 MHz blocker bandwidth.