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1. (WO2018042247) SWITCHABLE TRANSFORMER-BASED BALUN

Pub. No.:    WO/2018/042247    International Application No.:    PCT/IB2017/001170
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Thu Aug 31 01:59:59 CEST 2017
IPC: H03H 7/42
H03H 7/09
H03H 7/01
H01F 21/12
H01F 27/28
H01L 23/522
H03H 11/32
H01F 17/00
Applicants: ANALOG DEVICES GLOBAL UNLIMITED COMPANY
Inventors: ABDALLA, Mohamed A.
MOBARAK, Mohamed
KHALIL, Ahmed Ibrahim
Title: SWITCHABLE TRANSFORMER-BASED BALUN
Abstract:
A transformer-based balun circuit is disclosed herein. The balun can be implemented using a spiral transformer (204), where primary transformer windings (206) and secondary transformer windings (208) can be inductively coupled and can be implemented on the same metal layer (or different metal layers, e.g. vertically adjacent metal layers). The balun can further include a compensation capacitor (216) and a digital frequency tuning circuit (202). The compensation capacitor can be introduced at one of the differential terminals to reduce or suppress the amplitude and phase imbalance. The digital frequency tuning circuit can be a switchable bank of capacitors (C, 2C, 4C), which allows for tuning the frequency of operation of the transformer-based balun.