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A Wideband Calibration-Free D-Band Passive Phase Shifter With Frequency-Invariant Codes Over 24% Fractional Bandwidth

A Wideband Calibration-Free D-Band Passive Phase Shifter With Frequency-Invariant Codes Over 24% Fractional Bandwidth 150 150
Author(s): Basem Abdelaziz Abdelmagid, Yuqi Liu, Hua Wang

Abstract:

This work presents a compact 110–140 GHz bidirectional D-band passive phase shifter based on combining a 5-stage capacitively-loaded reflective-type PS (RTPS) with a wideband 0°/180° stage. The design achieves a 360° phase range with a resolution of 11.25°. By applying: 1) a wideband RTPS design methodology on the stage level; 2) frequency/switching-staggering techniques among the …

Published in: IEEE Solid-State Circuits Letters
Page(s): 329 – 332
Year of Publication: 2025
Electronic ISSN: 2573-9603
DOI: 10.1109/LSSC.2025.3622233
Publisher: IEEE

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A Low-Jitter Fractional-N Digital PLL Using a Quantization-Error-Compensating BBPD and an Orthogonal-Polynomial-Based LMS Calibration

A Low-Jitter Fractional-N Digital PLL Using a Quantization-Error-Compensating BBPD and an Orthogonal-Polynomial-Based LMS Calibration 150 150
Author(s): Munjae Chae, Seheon Jang, Seungjae Lee, Jaehyouk Choi

Abstract:

This work presents a 10.0–11.5-GHz fractional- $N$ digital phase-locked loop (DPLL) using the quantization-error-compensating bang–bang phase detector (QEC-BBPD) that can minimize both the static delay ( $T_{\mathrm {S}}$ ) and the dynamic delay ( $T_{\mathrm {D}}$ ) required for removing the delta-sigma modulator’s ( $\Delta \Sigma $ M) quantization-error (Q-error). Since the …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 1 – 13
Year of Publication: 2025
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2025.3611417
Publisher: IEEE

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RXO-LDPC: A Physics-Inspired Relaxation Oscillator-Based Solver Leveraging Six-Body Spin Interactions for Soft Decoding of LDPC Codes

RXO-LDPC: A Physics-Inspired Relaxation Oscillator-Based Solver Leveraging Six-Body Spin Interactions for Soft Decoding of LDPC Codes 150 150
Author(s): Evangelos Dikopoulos, Luke Wormald, Ying-Tuan Hsu, Wei Tang, Po-Shao Chen, Zhengya Zhang, Michael P. Flynn

Abstract:

Physics-inspired computing harnesses continuous-time (CT) operation, massive parallelism, and direct compute load mapping to coupled CMOS-based spins to accelerate solving complex optimization problems. This work advances the field by introducing relaxation oscillator (RXO)-low-density parity check (LDPC), a combinatorial optimization problem (COP) engine that natively supports six-body spin interactions for …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 1 – 14
Year of Publication: 2025
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2025.3561780
Publisher: IEEE

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