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A wide operating range and fast locking delay-locked loop (DLL) based frequency quadrupler that includes an eight-phase-clock generator and an edge combiner is proposed. The eight-phase-clock generator is composed of a coarse-code generator, a fine-code generator and a digital controlled delay line, which uses four differential delay units to generate equally spaced eight-phase clocks. The coarse-code...
A wide range delay-locked loop (DLL) based clock and data recovery (CDR) circuit including coarse and fine tune blocks is proposed in this paper. The coarse tune block adopts a time to digital converter and digital control delay line to widen the frequency capture range, reduce locking time and prevent the false locking problem. In the fine tune block, a novel phase detector combines the tasks of...
A wide-tuning-range and low-phase-noise LC voltage controlled oscillator (VCO) is presented in this paper. With the variable current source and source damping resistor, the proposed VCO exhibits a phase noise of −115dBc/Hz at 1MHz offset from 6 GHz carrier, and a power dissipation of 1.4mW. In addition, its tuning range is from 4.9 to 6.9 GHz with the MIM capacitor bank and differentially controlled...
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