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Several wireless biomedical transceivers, including medical implants communication systems (MICSs), require ultra-low-power low-complexity frequency synthesizers. This paper presents an all-digital frequency-locked loop (ADFLL)-based frequency synthesizer with a built-in frequency-shift keying modulator for MICS and industrial-scientific-medical band applications. Unlike all-digital phase-locked loops...
An all-digital frequency-locked loop (ADFLL) based frequency synthesizer with a built-in FSK modulator for medical implants communication systems (MICS) band applications is presented. The ADFLL uses a high resolution single-bit digital ΣΔ frequency discriminator in the feedback path and a ΣΔ phase accumulator in the reference path, achieving fractional resolution. The ADFLL uses a digital IIR-based...
Fractional-N synthesizers are subject to generation of undesired spurious energy due to both linear and nonlinear processes. Previously, we presented an accurate modeling of the nonlinear, time-varying nature of the phase frequency detector (PFD), charge pump and frequency divider [1]. The proposed modeling technique was able to predict in-band spur power levels within 1.8 dB accuracy. In this paper...
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