Abstract
A simple and robust technique for directly measuring the loop gain and bandwidth of a phase-locked loop (PLL) is proposed. This technique can be used for the real-time measurement of the real loop gain in a closed PLL without breaking its locking state. The agreement of the measured loop gain and theoretical calculations proves the validity of the proposed measurement technique. This technique with a simple configuration can be easily expanded to other phase-locking systems whose loop gain and bandwidth should be measured precisely.
Highlights
Phase-locked loops (PLLs)1,2 are widely used in a variety of applications including communication,3,4 frequency synthesis,5,6 clock generation,7 and signal processing
The Bode plot which is out of the bandwidth presents the gain of the modulation signal when it passes through the voltage-controlled oscillator (VCO) and phase detector without the suppression of the gain of the PLL
A simple and robust technique for measuring the loop gain and bandwidth of a PLL is proposed in this paper
Summary
Phase-locked loops (PLLs) are widely used in a variety of applications including communication, frequency synthesis, clock generation, and signal processing. One of the main reasons for the widely adopted use of the PLL in most photonics/electronics systems is because it provides a powerful tool in synchronization between two frequency oscillations. The loop gain can be measured precisely above the locking bandwidth These techniques proposed in the beforementioned studies can be used to estimate the loop gain and bandwidth of a PLL, they do not provide a tool to measure the real loop gain of the PLL precisely in the whole offset frequency due to the indirect estimation methods or the bandwidth-limited schemes with the inserted modulation signal.. These techniques proposed in the beforementioned studies can be used to estimate the loop gain and bandwidth of a PLL, they do not provide a tool to measure the real loop gain of the PLL precisely in the whole offset frequency due to the indirect estimation methods or the bandwidth-limited schemes with the inserted modulation signal.24,25 To overcome this problem, in this paper, a simple and robust technique for real-time measurement of the loop gain and bandwidth of a PLL over the whole offset frequency is proposed.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
