Abstract
In this paper, a technique of inductor coupling is used to optimize the bandwidth of the injection-locked transformer. This design replaces the inductance of a conventional injection-locked divider with a transformer consists by two coupled inductance, each has its own independent cross-coupled pair. This design is based on 40nm-CMOS technology, with a supply voltage of 0. 9V, the post-simulation results achieve a locking range of 71.8-87.9GHz with an injected signal of 0dBm, and the core chip size is 88$\times $1301$\mu \mathrm{m}^{2}$.
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