Transformers

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Design and Analysis of Windmill-Shaping-Geometry Eight-Phase Oscillator Incorporating Magnetic and Dual-Injection Coupling Techniques

Design and Analysis of Windmill-Shaping-Geometry Eight-Phase Oscillator Incorporating Magnetic and Dual-Injection Coupling Techniques 150 150
Author(s): Ya Zhao, Runchen Wang, Lingao Huang, Haitao Ren, Jun Yin, Pui-In Mak, Li Geng, Chao Fan

Abstract:

This article reports a compact millimeter-wave (mm-wave) quad-core eight-phase oscillator featuring magnetic coupling and dual-injection coupling. Specifically, the quad-core oscillator is integrated in an LC-ring configuration via a windmill-shaping transformer for phase noise (PN) and chip area reduction. The eight-phase oscillator could eliminate the oscillation mode ambiguity and save the …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 1 – 13
Year of Publication: 2026
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2026.3714874
Publisher: IEEE

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An Inductive-Load-Modulated Multiband Phase Shifter With <0.38°/0.12-dB RMS Errors

An Inductive-Load-Modulated Multiband Phase Shifter With <0.38°/0.12-dB RMS Errors 150 150
Author(s): Xinyi Wu, Chenxu Zhao, Hui Chen, Xun Bao, Yaolong Hu, Aoyang Zhang, Leibo Liu

Abstract:

This letter presents a compact, multiband reflection-type phase shifter (RTPS) implemented in 65-nm CMOS that overcomes the narrowband limitations of conventional passive loads. The proposed design utilizes an inductive-load modulation. By injecting a secondary signal to actively manipulate the magnetic flux, the equivalent inductance is boosted to enable operation across …

Published in: IEEE Solid-State Circuits Letters
Page(s): 170 – 173
Year of Publication: 2026
Electronic ISSN: 2573-9603
DOI: 10.1109/LSSC.2026.3694867
Publisher: IEEE

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ASAP: A 28-nm Transformer Training Accelerator With Alternating Sparsity and Asymmetrical Microscaling Precision

ASAP: A 28-nm Transformer Training Accelerator With Alternating Sparsity and Asymmetrical Microscaling Precision 150 150
Author(s): HanGyeol Mun, Jian Meng, Xiaofeng Hu, Yuan Liao, Chun-Ting Chen, Jae-sun Seo

Abstract:

This work presents ASAP, a 28-nm transformer-training accelerator that combines N:M structured sparsity with asymmetric microscaling floating-point (MXFP) precision through a unified algorithm–hardware co-design. ASAP introduces a progressive sparsity schedule in which pruned compute resources are reassigned to increase numerical precision for important weights and activations, stabilizing optimization …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 1 – 14
Year of Publication: 2026
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2026.3693653
Publisher: IEEE

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A BEV Perception Transformer Accelerator With Saliency-Driven Image/Point Cloud Fusion and Phase-Linked Dataflow in 28 nm CMOS

A BEV Perception Transformer Accelerator With Saliency-Driven Image/Point Cloud Fusion and Phase-Linked Dataflow in 28 nm CMOS 150 150
Author(s): Junyi Qian, Yuncheng Lu, Zhangrui Qian, Lishuo Deng, Zhihao Yan, Cai Li, Tony Tae-Hyoung Kim, Weiwei Shan

Abstract:

Deploying advanced Transformer-based models for real-time, high-accuracy multimodal bird’s-eye-view (BEV) perception in autonomous driving imposes substantial hardware demands. To address this, we propose a low-cost, low-power image/point-cloud fusion Transformer accelerator that supports two modes: high-performance driving and ultra-low-power sentry operation. We first propose a cross-modal saliency evaluation mechanism …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 1 – 12
Year of Publication: 2026
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2026.3691770
Publisher: IEEE

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MITTA: A Multi-Task Transformer Accelerator With Mixed Precision Structured Sparsity and Hierarchical Task-Adaptive Power Management

MITTA: A Multi-Task Transformer Accelerator With Mixed Precision Structured Sparsity and Hierarchical Task-Adaptive Power Management 150 150
Author(s): Qirui Zhang, Zichen Fan, Pierre Abillama, Sara Shoouri, Jungho Lee, Chien-Wei Tseng, Changwoo Lee, Wei Meng, Hun-Seok Kim, David Blaauw, Dennis Sylvester

Abstract:

This article presents MITTA, the first silicon-proven transformer accelerator optimized for multi-task inference across both natural language processing (NLP) and image processing domains. MITTA accelerates a task-sharing algorithm that minimizes sub-task computation by reusing both activations and weights from a shared base task, requiring only sparse delta computation for sub-tasks. …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 1 – 14
Year of Publication: 2026
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2026.3669815
Publisher: IEEE

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Design and Analysis of a 13.7–41 GHz Ultra-Wideband Frequency Doubler With Cross-Coupled Push-Push Structure

Design and Analysis of a 13.7–41 GHz Ultra-Wideband Frequency Doubler With Cross-Coupled Push-Push Structure 150 150
Author(s): Kai Li, Keping Wang, Fanyi Meng, Kiat Seng Yeo, Kaixue Ma

Abstract:

This article presents a 13.7–41 GHz ultra-wideband frequency doubler with high efficiency and conversion gain (CG). The proposed cross-coupled push-push structure, in conjunction with the fourth-order transformer-based resonator and the series gate inductor, collaboratively shapes the input signal amplitude such that three distinct peaks emerge at different frequencies, thereby significantly improving …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 1 – 15
Year of Publication: 2026
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2026.3667289
Publisher: IEEE

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A K/Ka-Band Transmit/Receive Front-End With Triple-Coupled Transformer Technique in 65-nm Bulk CMOS

A K/Ka-Band Transmit/Receive Front-End With Triple-Coupled Transformer Technique in 65-nm Bulk CMOS 150 150
Author(s): Nayu Li, Ziyao Xiong, Botao Yang, Hang Lu, Yiwei Liu, Xiaokang Qi, Gaopeng Chen, Na Yan, Chunyi Song, Zhiwei Xu

Abstract:

This article presents a K/Ka-band transmit/receive (T/R) front-end for jointed sensing and communication (JSAC) applications. A reconfigurable matching network for both signal reception and transmission is realized using the proposed triple-coupled transformer (TCT) technique, achieving low power loss and a compact footprint. The T/R switch at …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 1 – 12
Year of Publication: 2026
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2026.3667736
Publisher: IEEE

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A Compact Reconfigurable Dual-Path Dual-Band LNA for 5G NR FR2 Applications

A Compact Reconfigurable Dual-Path Dual-Band LNA for 5G NR FR2 Applications 150 150
Author(s): Pei Qin, Junyu Wu, Taotao Xu, Yongchun Li, Wenjie Feng, Quan Xue, Wenquan Che

Abstract:

This article presents a reconfigurable dual-path dual-band low noise amplifier (LNA) for fifth generation (5G) millimeter-wave (mmW) communications. A novel band-switching input matching architecture based on the cross-connected transistors is proposed to achieve optimal dual-band input matching and $g_{m}$ -boosting. This architecture allows the dual-band input transistors to share …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 1 – 14
Year of Publication: 2026
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2026.3661593
Publisher: IEEE

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Analysis and Design of Power Amplifier Using Parallel-Combined Multisegment Transformer

Analysis and Design of Power Amplifier Using Parallel-Combined Multisegment Transformer 150 150
Author(s): Geuntae Kim, Hyunjin Ahn, Kyutaek Oh, Ilku Nam, Ockgoo Lee

Abstract:

This letter presents a highly efficient power amplifier (PA) using a parallel-combined vertical multisegment transformer for 5G new radio (NR) applications operating in bands n257 and n258, in a 65-nm bulk CMOS process. A multisegment transformer facilitates a lower provided input impedance than a conventional transformer, enabling the PA to …

Published in: IEEE Solid-State Circuits Letters
Page(s): 85 – 88
Year of Publication: 2026
Electronic ISSN: 2573-9603
DOI: 10.1109/LSSC.2026.3665218
Publisher: IEEE

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