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5 days ago · We explore the concept of a digital phase-locked loop (PLL) of the first type, derived as an alternative solution to Kalman's estimation problem by employing the Tikhonov distribution rather than the traditional Gaussian model. The resulting Tikhonov PLL is a complex-valued nonlinear filter that is simple to implement and demonstrates interesting features in channels affected by strong phase noise. We present a comparative analysis including the classical PLL and Kalman filter to highlight ...
Jul 2, 2024 · This letter analyzes the impact of phase-locked loop (PLL) on small-signal stability in a system of interconnected grid-forming (GFM) and grid-following (GFL) converters. It identifies an undiscovered instability phenomenon, i.e., the system is prone to unstable when the bandwidth of PLL used with GFL converter is low. Experiments validate the theoretical analysis.
Jul 12, 2024 · A phase locked loop usually consists of a phase detector (PD), a filter (LF, loop filter) and a voltage controlled oscillator (VCO, voltage controlled oscillator) to form a forward path, and a frequency divider to form a frequency phase feedback path.
Phase-locked loop (PLL) is a type of closed-loop feedback control system that ensures phase and frequency coherence between its input and output signals. The basic synchronous reference frame phase-locked loop (SRF-PLL) is a conventional synchronization technique that is frequently employed in grid-connected systems for power electronic converters.
5 days ago · A frequency synthesizer may use the techniques of frequency multiplication, frequency division, direct digital synthesis, frequency mixing, and phase-locked loops to generate its frequencies. The stability and accuracy of the frequency synthesizer's output are related to the stability and accuracy of its reference frequency input.
Jul 14, 2024 · This paper presents a charge pump circuit with a wide output range and low current mismatch applied to phase-locked loops. In this designed structure, T-shaped analog switches are adopted to suppress the non-ideal effects of clock feedthrough, switching time mismatch, and charge injection. A source follower and current splitting circuits are proposed to improve the matching accuracy of the charging and discharging currents and reduce the current mismatch rate. A rail-to-rail high-gain ...
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Jul 12, 2024 · A phase-locked loop refers to a circuit or module that is used in a communication receiver to process the received signal and extract the phase information of a clock from it. In other words, for the received signal, a clock signal is imitated so that the two signals are synchronized (or coherent) from a certain perspective.
