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A digital PLL, realized in 45nm SOI CMOS, features a dual LC-tank DCO with nested inductors, achieving an octave of tuning range and area of 0.111 mm2. Digital control of coupled LC-tanks creates new capabilities, enabling a 10% increase in tuning range and a 28 times reduction of DCO gain. The rms jitter, integrated from fc/1667 to fc/2, is 362 fs at 12 GHz and 274 fs at 6 GHz.
An oscillator with a high-order (>2) resonator has multiple stable modes of oscillations. The stable modes for one such oscillator, having a fourth-order resonator, are found using a nonlinear analysis. By using a proper nonlinear active topology and tank component values, the fourth-order oscillator can generate either of the two distinct frequencies f1 or f2. A method is introduced to dynamically...
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