Designs of All Digital Phase Locked Loop

Singhal, Aastha; Madhu, Charu; Kumar, Vijay

doi:10.1109/raecs.2014.6799523

Cited by 16 publications

(4 citation statements)

References 17 publications

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“…At this point, the signal output from the demodulation In Figure 5 s block diagram, the FPGA generates a 100 kHz demodulation switch signal. This signal is then processed by the demodulation circuit to yield the output signal, as depicted in Equation (14). Subsequently, the signal is captured by AD and further processed within the FPGA.…”

Section: Phase Alignment System Designmentioning

confidence: 99%

“…This structure can achieve a reduction in 1/ f noise, thereby enhancing the performance of capacitive sensors. The other type is a digital structure [14], commonly implemented using DSP or FPFA [15], which can significantly enhance the processing speed and accuracy of the system. This aids in extracting information from weak modulated signals [16].…”

Section: Introductionmentioning

confidence: 99%

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Research and Implementation of a Demodulation Switch Signal Phase Alignment System in Dynamic Environments

Xue,

Yu,

Sui

et al. 2023

Sensors

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In the space gravitational wave detection mission, inertial sensors play the role of providing an inertial reference for the laser interferometric measurement system. Among them, the capacitance sensor serves as the core key technology of the inertial sensor, used to measure the relative position of the test mass (TM) in the electrode cage. The capacitance sensor utilizes synchronous demodulation technology to extract signals from the AC induction signal. When the phase of the demodulation switch signal is aligned, the synchronous demodulator can most effectively filter out noise, thus directly influencing the performance of the capacitance sensor. However, since the TM is in a suspended state, the information read by the capacitance sensor is dynamic, which increases the difficulty of demodulation phase alignment. In light of this, a method is proposed for achieving the phase alignment of the demodulation switch signal in a dynamic environment. This is accomplished by adjusting the phase of the demodulation switch signal, and subsequently computing the phase difference between the AC induction signal and the demodulation switch signal. At the same time, a measurement and evaluation method for phase deviation is also proposed. Ultimately, an automatic phase alignment system for the demodulation switch signal in dynamic environments is successfully implemented on an FPGA platform, and tests are conducted on a hexapod PI console platform to simulate dynamic environments. The experimental results demonstrate that the system accurately achieves phase alignment in the static environment, with a phase deviation of 0.1394 rad. In the simulated dynamic environment, the phase deviation is 0.1395 rad.

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Section: Phase Alignment System Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research and Implementation of a Demodulation Switch Signal Phase Alignment System in Dynamic Environments

Xue,

Yu,

Sui

et al. 2023

Sensors

View full text Add to dashboard Cite

show abstract

“…A PLL consists of a voltage controlled oscillator (VCO), phase detector and a low pass filter [7]. We implemented PLL digitally (digital phase locked loop) on the FPGA of NI GPIC using LabVIEW.…”

Section: A Implementation Of Pllmentioning

confidence: 99%

FPGA based Implementation of Frequency and Phase Matching Technique for Grid Tied Applications

Nadeem,

Atif,

Ahmed

et al. 2019

Preprint

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A grid tied inverter converts DC voltage into AC voltage, while synchronizing it with the supply line phase and frequency. This paper presents an efficient, robust, and easyto-implement grid tie mechanism. First, the grid tie mechanism was simulated in software using LabVIEW and Multisim. Then, the whole system was practically implemented on hardware. A prototype hardware was developed to produce AC voltage from solar panels. Phase and frequency of the generated voltage were synchronized with those of a reference sinusoidal signal. The synchronization mechanism was digitally implemented on an FPGA, which also controlled the whole system. We achieved real time frequency matching with an improved Zero Crossing Detection (ZCD) technique. Phase matching was also achieved in real time using a modified Phase Locked Loop (PLL) algorithm, which retains stability while being simpler than the general PLL algorithm. Experiments demonstrated that the proposed grid tied system reliably synchronized the phase and frequency of the voltage generated by the implemented hardware with those of the reference grid voltage.

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“…The PLL adjusts the control signal of the VCO by adding a phase frequency detector (PFD), which takes the integral of the phase difference between the feedback signal and the reference signal. Finally, the output frequency is locked when the phase difference is 0 [15]. Therefore, the PLL has stable performance.…”

Section: Introductionmentioning

confidence: 99%

A Startup Control Method for Plasma Lamps by Using Fractional-N Phase-Locked Loop Microwave Driver

Jia

Huan

et al. 2022

Electronics

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The microwave-driven plasma light source has the feature of the full spectrum, similar to sunlight, and has broad application prospects. Startups of plasma lamps are very difficult since the plasma density and the resonator impedance are changing constantly with the warm-up process and the RF driver can hardly couple the power to the plasma efficiently. This paper presents a startup control method for plasma lamps by using an integrated fractional-N phase-locked loop (PLL) as the RF signal source. An RF control module including a 21 dBm RF source with a band of 430–460 MHz and detection circuits for the RF driver is developed, and the startup process of the plasma lamp is further studied by analyzing the return loss of the resonator under the plasma load. According to the test result, the maximum frequency deviation of the RF control module is 3.3 kHz over the working temperature range of −40–80 °C. The designed RF control module is used to drive a high-power amplifier to start the plasma lamp automatically. It takes 79 s to achieve the stable arc operation from the gas breakdown. The return loss of the resonator is −26 dB, with an incident power of 171 W and reflected power of 418 mW, indicating that the RF driver and the plasma achieve good coupling. Compared with continuous wave, the luminous flux of the lamp powered by RF pulse improves by 18% under the same electric power. This startup control method has stable performance, small temperature drift, and an effective control function for plasma lamps.

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Designs of All Digital Phase Locked Loop

Cited by 16 publications

References 17 publications

Research and Implementation of a Demodulation Switch Signal Phase Alignment System in Dynamic Environments

Research and Implementation of a Demodulation Switch Signal Phase Alignment System in Dynamic Environments

FPGA based Implementation of Frequency and Phase Matching Technique for Grid Tied Applications

A Startup Control Method for Plasma Lamps by Using Fractional-N Phase-Locked Loop Microwave Driver

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