Accession Number:

AD0481321

Title:

A THRESHOLD CRITERION FOR PHASE LOCKED LOOP DESIGN

Descriptive Note:

Master's thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

• Roland, William F.

Report Date:

1963-01-01

Pagination or Media Count:

64.0

Abstract:

In modern communications systems where it is necessary to obtain maximum utilization of signal power, the phase locked loop is being designed into the system as a coherent detector. This loop has a threshold which occurs at very low signal to noise ratios, placing a lower bound on the range of useful signal to noise ratios. Since the loop operation becomes non-linear during threshold conditions, it is difficult to predict the threshold of a given loop during design stages. This paper presents experimental threshold data normalized to apply to a class of phase locked loops. A new definition of the optimum phase locked loop, and threshold are given, and a design method based on these definitions is described. In conjunction with this, the experimental set-up and method of measurement is described. The instrumentation is interesting because of the previously unexplored measurement technique.

Descriptors:

• *PHASE DETECTORS
• *PHASE LOCKED COMMUNICATIONS
• BANDPASS FILTERS
• COMMUNICATION SATELLITES
• DAMPING
• FREQUENCY MODULATION
• MATHEMATICAL MODELS
• PHASE MODULATION
• TARGET ACQUISITION
• VERY LOW FREQUENCY

Subject Categories:

• Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE