scholarly journals Direct loop gain and bandwidth measurement of phase-locked loop

2017 ◽  
Vol 88 (8) ◽  
pp. 084704 ◽  
Author(s):  
P. Ye ◽  
R. Ren ◽  
Y. Kou ◽  
F. Sun ◽  
J. Hu ◽  
...  
Keyword(s):  
Phase Locked Loop ◽  
Loop Gain ◽  
Bandwidth Measurement

scholarly journals Real-time loop gain and bandwidth measurement of phase-locked loop

2018 ◽  
Vol 89 (12) ◽  
pp. 124703
Author(s):  
Jie Tian ◽  
Kai Li ◽  
Yongsheng Cheng ◽  
Nan Xie ◽  
Dong Hou
Keyword(s):  
Real Time ◽  
Phase Locked Loop ◽  
Loop Gain ◽  
Time Loop ◽  
Bandwidth Measurement

scholarly journals Adaptive Gain Control Method of a Phase-Locked Loop for GNSS Carrier Signal Tracking

2018 ◽  
Vol 2018 ◽  
pp. 1-14
Author(s):  
Zhibin Luo ◽  
Jicheng Ding ◽  
Lin Zhao
Keyword(s):  
Control Method ◽  
Tracking Error ◽  
Gain Control ◽  
Phase Locked Loop ◽  
Satellite System ◽  
Error Characteristic ◽  
Loop Gain ◽  
Target Movement ◽  
Signal Tracking ◽  
Global Navigation Satellite

The global navigation satellite system (GNSS) has been widely used in both military and civil fields. This study focuses on enhancing the carrier tracking ability of the phase-locked loop (PLL) in GNSS receivers for high-dynamic application. The PLL is a very popular and practical approach for tracking the GNSS carrier signal which propagates in the form of electromagnetic wave. However, a PLL with constant coefficient would be suboptimal. Adaptive loop noise bandwidth techniques proposed by previous researches can improve PLL tracking behavior to some extent. This paper presents a novel PLL with an adaptive loop gain control filter (AGCF-PLL) that can provide an alternative. The mathematical model based on second- and third-order PLL was derived. The error characteristics of the AGCF-PLL were also derived and analyzed under different signal conditions, which mainly refers to the different combinations of carrier phase dynamic and signal strength. Based on error characteristic curves, the optimal loop gain control method has been achieved to minimize tracking error. Finally, the completely adaptive loop gain control algorithm was designed. Comparable test results and analysis using the new method, conventional PLL, FLL-assisted PLL, and FAB-LL demonstrate that the AGCF-PLL has stronger adaptability to high target movement dynamic.

scholarly journals Direct measurement of loop gain and bandwidth of phase-locked loop for mode-locked laser

2016 ◽  
Vol 24 (15) ◽  
pp. 17242 ◽  
Author(s):  
Dong Hou ◽  
Jie Tian ◽  
Fuyu Sun ◽  
Xianhe Huang
Keyword(s):  
Direct Measurement ◽  
Phase Locked Loop ◽  
Loop Gain ◽  
Mode Locked Laser

SUPPRESSING PHASE LOCKED LOOP GAIN FLUCTUATIONS IN WIDEBAND LINEARLY FREQUENCY MODULATED WAVEFORM SYNTHESIZERS

2012 ◽  
Vol 11 (02) ◽  
pp. 1250011
Author(s):  
WEN-QIN WANG
Keyword(s):  
Frequency Band ◽  
System Performance ◽  
Phase Locked Loop ◽  
Experimental Results ◽  
Limiting Factor ◽  
Voltage Controlled Oscillator ◽  
Effective Solution ◽  
Loop Gain ◽  
Compensation Algorithm

Wideband linearly frequency modulated (LFM) signals are required for many communication navigation applications; however, a limiting factor is the presence of frequency nonlinearity which degrades the system performance significantly. The fluctuations of phase locked loop (PLL) loop gain and voltage controlled oscillator (VCO) gain will results in inconsistent frequency nonlinearity performance in the whole frequency band. In this letter, we propose an effective solution by real-timely tuning the phase/frequency detecting current, along with the iterative compensation algorithm. In this way, the frequency nonlinearity is compensated and a wideband LFM waveform synthesizer can be designed. This approach is validated by experimental results.

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