Low cost and low power open-loop frequency synthesiser
2010
A fully integrated frequency synthesiser based on a low-cost and low-power multifunctional phase-locked loop (PLL) is proposed for frequency shift keying applications. The optimised open-loop modulation circuit and its digital control module are detailed. The 0.166 mm 2 synthesiser is implemented in a 0.28 μm CMOS technology with 2.5 V supply voltage. Measurement results related to the open-loop frequency drift and demodulated signal together with the PLL lock time are presented.
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