PROJECT TITLE :

A Transformer-Based Poly-Phase Network for Ultra-Broadband Quadrature Signal Generation

ABSTRACT:

This paper presents a transformer-based poly-part network to get absolutely differential quadrature signals with low loss, compact area, and high-precision magnitude and phase balance over an ultra-wide bandwidth. A totally differential high-coupling 8-port folded transformer-based quadrature hybrid serves as the fundamental building block for the poly-phase unit stage to realize significant size reduction and low loss. Multiple poly-phase unit stages will be cascaded to make the multistage poly-part network to substantially extend the quadrature signal generation bandwidth. The designs of the high-coupling transformer-based mostly quadrature hybrid, the poly-section unit stage, and the multistage transformer-based poly-phase network are presented with the closed-form style equations during this paper. As a signal-of-concept design, a three-stage transformer-primarily based poly-section network is implemented in an exceedingly standard 65 nm bulk CMOS process with a core area of 772 $mu$m$,times,$925 $mu$m. Measurement results of this poly-phase network over 3 independent samples demonstrate that the output In-Phase and Quadrature (I/Q) magnitude mismatch is but one dB from a pair of.eight GHz to twenty one.eight GHz with a passive loss of 3.sixty five dB at half dozen.four GHz. The measured output I/Q part error is but 10$^circ$ from 0.1 GHz to 24 GHz. The effective Image Rejection Ratio (IRR) based mostly on the measured I/Q balancing is more than thirty dB from 3.seven GHz to twenty two.5 GHz. The three-stage transformer-primarily based poly-phase network style achieves high-quality quadrature signal generation over a initial-ever one-decade bandwidth along with low-loss and compact area.