A 39 GHz 2×16-Channel Phased-Array Transceiver IC With Compact, High-Efficiency Doherty Power Amplifiers

Jung, Jinhwan; Lee, Jooseok; Kang, Daehyun; Kim, Jin-Hyun; Lee, Woo‐Jae; Oh, Hansik; Park, Jae-hong; Kım, Kihyun; Lee, Dong-Hyun; Lee, Sang-Ho; Lee, Jehee; Kim, Ji Hoon; Kim, Young‐Hwan; Kim, Tae‐Wan; Park, Sang Yong; Park, Seungwon; Baek, Seungjae; Suh, Bohee; Oh, Seungin; Lee, Dongsoo; Son, Jaeman; Yang, SeungCheol

doi:10.1109/rfic54547.2023.10186130

“…Recently, millimeter-wave (mm-wave) transceivers have been intensively researched for multi-Gb/s data transfer with low-latency and high reliability [1][2][3][4][5][6][7][8]. For fifth-generation (5G) cellular communications, n260 (37~40 GHz) and n257 (26.5~29.5 GHz) mm-wave bands are allocated for 5G applications [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…For fifth-generation (5G) cellular communications, n260 (37~40 GHz) and n257 (26.5~29.5 GHz) mm-wave bands are allocated for 5G applications [9][10][11]. Transceiver systems [1][2][3][4][5][6][7][8] have successfully demonstrated 5G cellular communications using mm-wave bands. The transceivers for mm-wave 5G cellular communications use phased arrays to enhance communication distance and coverage to non-line-of-sight propagation [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A 28 GHz Highly Linear Up-Conversion Mixer for 5G Cellular Communications

Byeon

2024

Technologies

0

View full text Add to dashboard Cite

In this paper, we present a highly linear direct in-phase/quadrature (I/Q) up-conversion mixer for 5G millimeter-wave applications. To enhance the linearity of the mixer, we propose a complementary derivative superposition technique with pre-distortion. The proposed up-conversion mixer consists of a quadrature generator, LO buffer amplifiers, and an I/Q up-conversion mixer core and achieves an output third-order intercept point of 15.7 dBm and an output 1 dB compression point of 2 dBm at 27.6 GHz, while it consumes 15 mW at a supply voltage of 1 V. The conversion gain is 11.4 dB and the LO leakage and image rejection ratio are −56 dBc and 61 dB, respectively, in the measurement. The proposed I/Q up-conversion mixer is suitable for 5G cellular communication systems.

show abstract

“…Even though it is close to 100 years since its invention, first publication, and patent in 1936 by Willliam H. Doherty [1,2], it is still highly present in today's wireless systems, and in the research for tomorrow's. However, with the exception of two recently published papers [3] and [4], the published 5G mmW transceivers during recent years all focus on class AB PAs to support the tough linearity requirements that follow transmissions of wideband, high peak to average (PAR), orthogonal frequency division multiplexing (OFDM) signals with high order modulations [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. A growing interest for deploying adaptive bias, i.e.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of a GHz Bandwidth Adaptive Bias Circuit for an mmW Doherty Amplifier

Elgaard,

Sjoland

2024

Preprint

0

View full text Add to dashboard Cite

This paper derives theoretical results for adaptive bias in Doherty amplifiers and presents the design and measurements of an integrated adaptive bias circuit tailored for high peak-to-average high bandwidth signals. Fundamental equations for output power, impedance, and efficiency of the complete Doherty amplifier are derived. Even with ideal transistor models, the Doherty amplifier is fundamentally nonlinear due to saturation of the main amplifier and class-C nonlinearity of the auxiliary. Increasing the transconductance of the auxiliary amplifier mitigates the distortion. Adaptive bias offers the possibility to control the output current characteristic of the auxiliary amplifier. This means that adaptive bias linearises and mitigates the need for an oversized auxiliary amplifier. Both methods, transconductance scaling and adaptive bias, are analysed and compared as well as having a band limited adaptive bias signal. The design of a multiple GHz bandwidth adaptive bias circuit is presented. To verify the circuit design and the theoretical predictions, an mmW Doherty amplifier in 22 nm CMOS-FD-SOI, utilizing the presented adaptive bias circuit, is measured and compared with and without adaptive bias. Comparison is conducted both using continuous-wave and modulated high bandwidth signals. Measured results confirm the predicted improvements by the adaptive bias as derived by the theoretical analysis.

show abstract

Analysis and design of a GHz bandwidth adaptive bias circuit for an mmW Doherty amplifier

Elgaard,

Sjöland

2024

Analog Integr Circ Sig Process

0

View full text Add to dashboard Cite

This paper derives theoretical results for adaptive bias in Doherty amplifiers and presents the design and measurements of an integrated adaptive bias circuit tailored for high peak-to-average high bandwidth signals. Fundamental equations for output power, impedance, and efficiency of the complete Doherty amplifier are derived. Even with ideal transistor models, the Doherty amplifier is fundamentally nonlinear due to saturation of the main amplifier and class-C nonlinearity of the auxiliary. Increasing the transconductance of the auxiliary amplifier mitigates the distortion. Adaptive bias offers the possibility to control the output current characteristic of the auxiliary amplifier. This means that adaptive bias linearises and mitigates the need for an oversized auxiliary amplifier. Both methods, transconductance scaling and adaptive bias, are analysed and compared as well as having a band limited adaptive bias signal. The design of a multiple GHz bandwidth adaptive bias circuit is presented. To verify the circuit design and the theoretical predictions, an mmW Doherty amplifier in 22 nm CMOS-FD-SOI, utilizing the presented adaptive bias circuit, is measured and compared with and without adaptive bias. Comparison is conducted both using continuous-wave and modulated high bandwidth signals. Measured results confirm the predicted improvements by the adaptive bias as derived by the theoretical analysis.

show abstract

A 39 GHz 2×16-Channel Phased-Array Transceiver IC With Compact, High-Efficiency Doherty Power Amplifiers

Cited by 5 publications

References 8 publications

A 28 GHz Highly Linear Up-Conversion Mixer for 5G Cellular Communications

A 28 GHz Highly Linear Up-Conversion Mixer for 5G Cellular Communications

Analysis and Design of a GHz Bandwidth Adaptive Bias Circuit for an mmW Doherty Amplifier

Analysis and design of a GHz bandwidth adaptive bias circuit for an mmW Doherty amplifier

Contact Info

Product

Resources

About