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This paper presents a D-band frequency quadrupler from 124GHz to 158GHz. The design leverages a folded-transformer based passive network to generate high-quality and broadband differential quadrature driving signals with low loss for the input tone centered at 35GHz. Then, the four-phase signals drive the 1st-stage frequency doublers to yield fully differential signals at the 2nd harmonic frequency...
This paper presents the design scheme of an ultra-broadband compact mm-wave Butler Matrix. The design employs new transformer-based swapped-port couplers and lumped LC-based π-network phase shifters to achieve an extremely compact chip size and ultra-broad bandwidth. This scheme is implemented as a 4×4 Butler Matrix in a standard 65nm CMOS technology with a core area of 0.335×0.215 mm2 and a broad...
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