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TDTL Based Frequency Synthesizers with Auto Sensing Technique

Author(s): Mahmoud AL-QUTAYRI | Saleh AL-ARAJI | Abdulrahman AL-HUMAIDAN

Journal: International Journal of Communications, Network and System Sciences
ISSN 1913-3715

Volume: 02;
Issue: 05;
Start page: 330;
Date: 2009;
Original page

Keywords: Time-Delay Tanlock Loop | Frequency Synthesizer | Phase Lock Loop | Indirect Synthesis

This paper presents a frequency synthesizer architecture based on the time delay digital tanlock loop (TDTL). The loop is of the first order type. The synthesizer architecture includes an adaptation mechanism to keep the complete system in lock. The mechanism uses a frequency sensing structure to control critical TDTL parameters responsible for locking. Both integer and fractional multiples of the loop reference frequency are synthesized by the new architecture. The ability of the TDTL based frequency synthesizer to respond to sudden variations in the system input frequency is studied. The results obtained indicate the proposed synthesizer has a robust performance and is capable of responding to those changes provided that they are within the bounds of its locking region.
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