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Design and Tuning of Coupled-LC mm-Wave Subharmonically Injection-Locked Oscillators This publication appears in: IEEE Transactions on Microwave Theory and Techniques Authors: G. Mangraviti, K. Khalaf, B. Parvais, K. Vaesen, V. Szortyka, G. Vandersteen and P. Wambacq Volume: 63 Issue: 7 Pages: 2301-2312 Publication Date: Jul. 2015
Abstract: This paper analyzes and demonstrates the use of coupled-LC tanks to enlarge the locking range (LR) of millimeter-wave (mm-wave) subharmonically injection-locked oscillators. Design guidelines are derived from a simplified analysis. Different techniques are proposed to tune the coupled-LC tank. A mm-wave subharmonically injection-locked quadrature voltage-controlled oscillator in 40-nm CMOS verifies the proposed approach. The LR is larger than 2 GHz over a 55ᇓ-GHz tuning range. An on-chip envelope detector facilitates the tuning of the coupled-LC tank. The phase noise and the quadrature-phase imbalance are uniform over almost the whole LR.
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