Analysis and Design of an E-Band Transformer-Coupled Low-Noise Quadrature VCO in 28-nm CMOS
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An E-band quadrature voltagecontrolled oscillator implemented in 28-nm CMOS. Two fundamental oscillators are coupled by means of gate-to-drain transformers to realize accurate quadrature phases and switched coupled inductors are added for tuning extension. Closed-form expressions of the oscillation frequency and the tuning extension design parameters are derived.