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Q‐boosted switched inductor based on 1:2 transformer
Author(s) -
Chen Zhe,
Fan Kuikui,
Zhai Jianfeng
Publication year - 2019
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31948
Subject(s) - inductor , transformer , inductance , electrical engineering , electromagnetic coil , eddy current , q factor , electronic engineering , materials science , engineering , voltage , resonator
In this article, the development of quality factor (Q) boosted switched inductor based on 1:2 transformer is presented. The Q‐boosted switched inductor consists of 1:2 inductor‐loaded transformer and RF switch. The eddy current in the secondary coil, equivalent inductance, and Q‐boosted factor are theoretically analyzed and derived. In the proposed topology at switch ON‐state, the eddy current in the secondary coil will decrease to 1/2, and the dissipated power due to the switch on‐resistance will decrease to 1/4, compared with conventional switched inductor with 1:1 inductor‐loaded transformer. Thus, the inductor Q will be boosted at switch ON‐state. Prototype has been designed and fabricated for the Q‐boosted and conventional switched inductors. Measured results show the peak inductor Q is greatly improved from 19.3 to 30.4 at ON‐state. The proposed Q‐boosting method is compatible with multiple planar circuit techniques, that is, PCB, low‐temperature co‐fired ceramic (LTCC), monolithic microwave integrated circuit (MMIC) techniques, etc.