A Multimode 28 GHz CMOS Fully Differential Beamforming IC for Phased Array Transceivers
Author:
Bhatta Ayush1ORCID, Park Jeongsoo2ORCID, Baek Donghyun3ORCID, Kim Jeong-Geun1
Affiliation:
1. Department of Electronic Engineering, Kwangwoon University, Seoul 01897, Republic of Korea 2. Department of Information Technology and Electrical Engineering, ETH, 8092 Zurich, Switzerland 3. School of Electrical Engineering, Chung-Ang University, Seoul 06974, Republic of Korea
Abstract
A 28 GHz fully differential eight-channel beamforming IC (BFIC) with multimode operations is implemented in 65 nm CMOS technology for use in phased array transceivers. The BFIC has an adjustable gain and phase control on each channel to achieve fine beam steering and beam pattern. The BFIC has eight differential beamforming channels each consisting of the two-stage bi-directional amplifier with a precise gain control circuit, a six-bit phase shifter, a three-bit digital step attenuator, and a tuning bit for amplitude and phase variation compensation. The Tx and Rx mode overall gains of the differential eight-channel BFIC are around 11 dB and 9 dB, respectively, at 27.0–29.5 GHz. The return losses of the Tx mode and Rx mode are >10 dB at 27.0–29.5 GHz. The maximum phase of 354° with a phase resolution of 5.6° and the maximum attenuation of 31 dB, including the gain control bits with an attenuation resolution of 1 dB, is achieved at 27.0–29.5 GHz. The root mean square (RMS) phase and amplitude errors are <3.2° and <0.6 dB at 27.0–29.5 GHz, respectively. The chip size is 3.0 × 3.5 mm2, including pads, and Tx mode current consumption is 580 mA at 2.5 V supply voltage.
Funder
Institute of Information & Communications Technology Planning & Evaluation (IITP) grant funded by the Korea government Research Grant of Kwangwoon University
Subject
Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry
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