A broadband compact low-loss 4$\times$ 4 butler matrix in CMOS with stacked transformer based quadrature couplers
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Date
2016Type
- Conference Paper
ETH Bibliography
no
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Abstract
This paper presents an ultra-broadband ultracompact Butler Matrix design scheme. The design employs stacked transformer based couplers and lumped LC π-network phase shifters for substantial size reduction. As a proof-of-concept design, a 4×4 Butler Matrix is implemented in a standard 130nm bulk CMOS process at a center frequency of 2.0 GHz. Compared with reported fully integrated 2.0 GHz 4×4 Butler Matrix designs in CMOS, the proposed design achieves the lowest insertion loss of 1.10dB, the smallest amplitude mismatch of 0.3 dB, the largest fractional bandwidth of 34.6%, and the smallest chip core area of 0.635×1.122 mm2. Based on the measured S-parameters, the four concurrent electrical array patterns of the Butler Matrix achieve array peak-to-null ratio (PNR) of 29.5 dB at 2.0 GHz and better than 15.0 dB between 1.55 GHz and 2.50 GHz. Show more
Publication status
publishedExternal links
Book title
2016 IEEE MTT-S International Microwave Symposium (IMS)Pages / Article No.
Publisher
CurranEvent
Subject
Beam-forming; Butler matrix; CMOS integrated circuits; MIMO; Phased-array; Quadrature coupler; Stacked transformerOrganisational unit
09757 - Wang, Hua / Wang, Hua
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ETH Bibliography
no
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