A 39GHz Divide-by-8 LC-Ring ILFD Designed for 5G New Radio n260 Band

Yamazaki, Yudai; Alvin, Joshua; Pang, Jian; Shirane, Atsushi; Okada, Kei

doi:10.1109/icta53157.2021.9661812

Cited by 2 publications

(1 citation statement)

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“…However, the locking range is limited because undesired harmonic signals will interfere with the oscillator's injection locking. In recent research, ILFDs using a dual-step injection approach are presented for removing undesired harmonic signals in divide-by-4 operation [28], [29], [30]. However, the operation at higher frequencies is limited due to the degradation of the injection signal by the large parasitic capacitance of transistors.…”

Section: B Transformer-based Injection-enhanced Ilfdmentioning

confidence: 99%

A 37–43.5-GHz Phase and Amplitude Detection Circuit With 0.049° and 0.036-dB Accuracy for 5G Phased-Array Calibration Using Transformer-Based Injection-Enhanced ILFD

Yamazaki

Sakamaki

Pang

et al. 2023

IEEE J. Solid-State Circuits

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This article introduces a high-accuracy phase and amplitude detection circuit for 5G phased-array calibration. By utilizing a 39 GHz-150 kHz down-conversion scheme, the phase and amplitude information are detected separately with a phase-to-digital converter (PDC) and an analogto-digital converter (ADC). In addition, to reduce the number of reference signals, a divide-by-4 injection-locked frequency divider (ILFD) using a transformer-based injection-enhancing technique is implemented for wideband reference signal generation. This ILFD realizes a wide locking range of 16.3-23.4 GHz (35.8%) with 5.05-mW power consumption. The detection circuit achieves less than 0.049 • and 0.036-dB detection rms errors at 39 GHz. The wideband high-accuracy detection is also achieved from 37 to 43.5 GHz. The total power consumption is 50 mW with a 1-V VDD. The total core area is 1.43 mm 2 in a 65-nm CMOS process.

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Section: B Transformer-based Injection-enhanced Ilfdmentioning

confidence: 99%