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A High Data Rate, High Output Power 60 GHz OOK Modulator in 90 nm CMOS
변철우,박철순 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.3
In this paper, we present a 60 GHz on-off keying (OOK) modulator in a 90 nm CMOS. The modulator employs a current-reuse technique and a switching modulation for low DC power dissipation, high on/off isolation, and high data rate. The measured gain of the modulator, on/off isolation, and output 1-dB compression point is 9.1 dB, 24.3 dB, and 5.1 dBm, respectively, at 60 GHz. The modulator consumes power consumption of 18 mW, and is capable of handling data rates of 8 Gb/s at bit error rate of less than 10-6 for 231-1 PRBS over a distance of 10-cm with an OOK receiver module.
A Millimeter-wave CMOS Cross-Polarization Leakage Canceller for Dual-Polarized MIMO Systems
유인철,조동욱,변철우 한국과학기술원 반도체설계교육센터 2022 IDEC Journal of Integrated Circuits and Systems Vol.8 No.3
This article introduces a power-efficient millimeter-wave CMOS cross-polarization canceller for dual-polarized multiple-in-multiple-out (MIMO) systems. The dual-polarized MIMO systems can transmit two independent data streams at the same time using a horizontally polarized and vertically polarized waves. A dual-polarized antenna provides a cross-polarization isolation, which offers spatial diversity. However, the module placement, propagation, and antenna/package non-idealities cause polarization coupling resulting in degradation of the error vector magnitude. To reduce cross-polarization leakage from these non-idealities, a power-efficient passive cross-polarization leakage cancellation path is introduced. The cross-polarization leakage canceller consists of horizontal path (H-path), vertical to horizontal cancellation (V-H C) path, vertical path (V-path), and horizontal to vertical cancellation (H-V C) path. The H-path and V-path consist of the variable gain amplifier (VGA), and the V-H C path and H-V C path consist of reflection type attenuator, 0/90° 1-bit phase shifter, 0/180° 1-bit phase shifter, and 0 to 90° continuous phase shifter. Implemented in 65 nm CMOS, the proposed cross-polarization canceller improved the cross-polarization isolation better than 21.7 dB.