A circuit of a ring voltage controlled oscillator (VCO), which is to be used in high-speed phase-locked loop (PLL) systems integrated into programmable logic integrated circuits, is proposed. The maximum operating frequency of a VCO in 180 nm CMOS is shown by simulation to be able to reach 2 GHz in all operating conditions with the phase noise being −99 dB/Hz and detuning frequency being 1 MHz.
Russian Microelectronics – Springer Journals
Published: Nov 14, 2014
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