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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,...
A digitally controlled artificial dielectric (DiCAD) differential transmission line is designed to perform agile linear phase shift over 100deg with thermometer-coded 16 step control. It also operates with a 16 gain-step VGA to enable re-configurable and direct-frequency modulation at 60 GHz with 2562 states (1.1deg angular and 0.0007 magnitude resolutions) and -31 dB static EVM for multiple PSK/QAM...
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