Title :
On the design of an offset-PLL modulation loop for the EGSM band
Author :
Hafez, Amr ; Aboueldahab, Waleed F. ; Helmy, Ahmed
Author_Institution :
Dept. of Electron. & Commun., Cairo Univ., Giza, Egypt
Abstract :
Issues associated with the system design of an offset phase locked modulation loop (OPLL) are presented in this paper. The sources of spurs within the loop are all explained in detail. In order to meet the transmission mask stringent requirements for the EGSM band, a criteria for choosing the IF frequency is presented. Additionally, the paper gives the design procedures for calculating the required suppression of the offset mixer spurious signals by the offset mixer and feed back filter with respect to the IF signal.
Keywords :
frequency modulation; low-pass filters; mixers (circuits); phase locked loops; voltage-controlled oscillators; EGSM band; IF signal; feed back filter; offset PLL modulation loop; offset mixer spurious signals; offset phase locked modulation loop design; transmission mask stringent; voltage-controlled oscillators; Feedback; Filtering; Mixers; Phase frequency detector; Phase modulation; Power harmonic filters; Pulse width modulation; Radio frequency; Radio transmitters; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
DOI :
10.1109/ISCAS.2004.1328963
