Power generation

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A 298–334-GHz Scalable Injection-Locked Phased-Array Radiator With Second-Subharmonic-Termination-Assisted Waveform Formulation for Power Enhancement

A 298–334-GHz Scalable Injection-Locked Phased-Array Radiator With Second-Subharmonic-Termination-Assisted Waveform Formulation for Power Enhancement 150 150
Author(s): Meng Yang, Liang Wu

Abstract:

This article introduces an injection-locked $4\times 2$ phased-array radiator featuring scalability in both horizontal and vertical dimensions. The system architecture is constructed by sequentially cascading four identical phase-shifting and frequency-quadrupling (PSFQ) elements in a chain-like configuration and then cohering two such chains, thereby achieving global frequency synchronization. Particularly, phase shifting and …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 1 – 12
Year of Publication: 2025
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2025.3624563
Publisher: IEEE

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A Compact Current-Reusing 6-mW 66–92 GHz Frequency Quadrupler With 5% Peak Power Added Efficiency and >36 dBc Harmonic Rejection in 22-nm FDSOI CMOS

A Compact Current-Reusing 6-mW 66–92 GHz Frequency Quadrupler With 5% Peak Power Added Efficiency and >36 dBc Harmonic Rejection in 22-nm FDSOI CMOS 150 150
Author(s): Shankkar Balasubramanian, Kristof Vaesen, Piet Wambacq, Carsten Wulff

Abstract:

This letter presents a frequency quadrupler with 32% fractional bandwidth (66–92 GHz) and 5% peak power-added efficiency (PAE), capable of operating with an input power of 0 dBm. The quadrupler consisting of two cascaded frequency doublers uses a multiport driven push-push complementary architecture for the first stage to generate differential signals for the second …

Published in: IEEE Solid-State Circuits Letters
Page(s): 301 – 304
Year of Publication: 2025
Electronic ISSN: 2573-9603
DOI: 10.1109/LSSC.2025.3614381
Publisher: IEEE

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CORDIC-Less Digital Polar Transmitter Architecture Based on Delta-Sigma Modulator

CORDIC-Less Digital Polar Transmitter Architecture Based on Delta-Sigma Modulator 150 150
Author(s): Yuncheng Zhang, Zezheng Liu, Duo Li, Minzhe Tang, Yi Zhang, Hóngyè Huáng, Dingxin Xu, Waleed Madany, Ashbir Aviat Fadila, Wenqian Wang, Yuang Xiong, Daxu Zhang, Garry Pranata Kusuma, Hiroyuki Sakai, Kazuaki Kunihiro, Atsushi Shirane, Kenichi Okada

Abstract:

Conventional digital polar transmitters (TXs) suffer from limited power efficiency and linearity due to the multi-bit nature of intermediate signals. This work proposes a digital polar TX architecture that avoids such drawbacks by reducing the bit count of TX signals. The proposed TX oversamples and quantizes multi-bit I/Q inputs …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 1 – 14
Year of Publication: 2025
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2025.3611233
Publisher: IEEE

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SLiMDO: A Single-Link Multi-Domain-Output Isolated DC–DC Converter With Passive Magnetic Flux Sharing for Local Energy Distribution and Rx Behavior Sensing-Based Global Power Modulation

SLiMDO: A Single-Link Multi-Domain-Output Isolated DC–DC Converter With Passive Magnetic Flux Sharing for Local Energy Distribution and Rx Behavior Sensing-Based Global Power Modulation 150 150
Author(s): Jianqiang Jiang, Lei Zhao, Junyao Tang, Cheng Huang

Abstract:

This article introduces a small form-factor single-link multi-domain-output (SLiMDO) isolated dc–dc converter design. The proposed design provides two regulated outputs in separate domains in the receiver (Rx) side with a single micro-transformer. These isolated Rxes achieve local voltage regulation and automatic energy distribution across domains through passive magnetic flux …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 1 – 15
Year of Publication: 2025
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2025.3606903
Publisher: IEEE

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A Millimeter-Wave Direct Digital Transmitter Using Multiphase Subharmonic Switching PA

A Millimeter-Wave Direct Digital Transmitter Using Multiphase Subharmonic Switching PA 150 150
Author(s): Soumya Mahapatra, Mostafa Ayesh, Ce Yang, Mayank Palaria, Shiyu Su, Aoyang Zhang, Mike Shuo-Wei Chen

Abstract:

This article presents a direct digital transmitter (TX) employing a multiphase subharmonic switching (MP-SHS) power amplifier (PA) to achieve both high peak and power back-off (PBO) efficiency with wide signal bandwidth. A phase-shifted subharmonic (SH) local oscillator (LO) divider is proposed to suppress SH spurs with minimal implementation overhead by …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 1 – 16
Year of Publication: 2025
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2025.3605564
Publisher: IEEE

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A 240-GHz Sub-THz Direct-Conversion Transmitter With I/Q Phase Calibration in 40-nm CMOS

A 240-GHz Sub-THz Direct-Conversion Transmitter With I/Q Phase Calibration in 40-nm CMOS 150 150
Author(s): Chun-Sheng Lin, Chih-Hsueh Lin, Chun-Hsing Li

Abstract:

A 240-GHz direct-conversion transmitter (TX), consisting of an LO chain and fundamental I/Q mixers, is proposed for sub-THz communication applications. The LO chain integrates phase-shifter-embedded impedance matching networks (IMNs) and frequency tripler with an optimized harmonic IMN, delivering I/Q LO signals at 240 GHz with high output power, 360° phase …

Published in: IEEE Solid-State Circuits Letters
Page(s): 225 – 228
Year of Publication: 2025
Electronic ISSN: 2573-9603
DOI: 10.1109/LSSC.2025.3592246
Publisher: IEEE

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A 0.7-V Multiclass Digital Doherty Power Amplifier for BLE Applications With 41% Peak DE in 22-nm CMOS

A 0.7-V Multiclass Digital Doherty Power Amplifier for BLE Applications With 41% Peak DE in 22-nm CMOS 150 150
Author(s): Edoardo Baiesi Fietta, David Seebacher, Davide Ponton, Andrea Bevilacqua

Abstract:

This letter presents a multiclass, asymmetric digital Doherty power amplifier (DDPA) for Bluetooth low energy (BLE) applications, that achieves high efficiency at full-scale as well as at 8.6-dB back-off using a single 0.7-V supply voltage. The proposed DDPA is made of two power-combined switched-capacitor power amplifiers (SCPAs) and uses an …

Published in: IEEE Solid-State Circuits Letters
Page(s): 217 – 220
Year of Publication: 2025
Electronic ISSN: 2573-9603
DOI: 10.1109/LSSC.2025.3591570
Publisher: IEEE

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