WASMI OSMAN LUHAIB, S.; KHALID KHALEEL MOHAMMED, D. Design of Delta-Sigma ΣΔ based Fractional N PLL Frequency Synthesizer for GSM Mobile Systems. Al-Rafidain Engineering Journal (AREJ), [S. l.], v. 20, n. 3, p. 26–34, 2012. DOI: 10.33899/rengj.2012.50474. Disponível em: https://jamh.uomosul.edu.iq/index.php/arej/article/view/30576. Acesso em: 8 sep. 2025.