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Mutually connected phase-locked loop (PLLs) networks for timing and pattern recognition

Grant number: 06/04653-5
Support Opportunities:Scholarships in Brazil - Post-Doctoral
Effective date (Start): January 01, 2007
Effective date (End): December 31, 2009
Field of knowledge:Engineering - Electrical Engineering - Electrical, Magnetic and Electronic Circuits
Principal Investigator:José Roberto Castilho Piqueira
Grantee:André Alves Ferreira
Host Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil


Connected oscillators systems are present in innumerable natural processes; therefore the study and construction of synchronous systems became an essential part of the contemporaries technology and sciences. The telecommunications systems wide use the electronic oscillator synchronism, being the system efficiency related with the synchronism stability. The great advantage of full-connected network is keeping the synchronism as one or more knots are loosed. The network stability and synchronism are kept by PLLs (Phase-Looked Loops), which are circuits capable to synchronize the oscillators to the reference signals. After synchronised, the oscillator phase difference between reference signal and emitted signal be constant, eventually, be null. In these networks the interactions between knots occur by modulation of phases and have crucial relations dependence between its resonant frequencies. The objective of this work is a low cost construction of a full-connected PLLs network to develop great precision synchronism meshes and pattern recognition.

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