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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...
A major source of close-in phase noise in DeltaSigma fractional-N frequency synthesizers is noise-folding due to the nonlinear behavior of the combined phase- frequency detector (PFD)/charge-pump (CP) circuit. A fractional-N PLL with an analog discrete-time PFD and loop filter, along with an error canceling DAC is utilized to alleviate the impact of DeltaSigma quantization error and nonlinearities...
Built-in self test techniques for local oscillator phase noise, RF front-end circuits, baseband building blocks and transceiver loop-back are described. CMOS implementation of integrated RF test components, including RF detectors and phase discriminators are introduced. These devices eliminate the need for expensive external test equipment. The presented test strategies can also be used at wafer-level...
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