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A digital controlled artificial dielectric (DiCAD) differential transmission line is embedded in 90 nm CMOS to digitally tune a 58-64 GHz DCO. DiCAD varies epsivr,eff from 18.8 to 32.5. A shunt open stub DiCAD provides discrete capacitive tuning with 13.1deg S11 phase variation. The core oscillator is an inductively loaded differential, cross-coupled NMOS pair. Large nonlinear varactors are avoided,...
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