Fast Switching Fractional-N Frequency Synthesizer Architecture Using TDTL

• 作者: Abdulrahman Al-HUMAIDAN Mahmoud A. AL-QUTAYRI Saleh R. AL-ARAJI
• 来源期刊: 通讯、网络与系统学国际期刊(英文)
• 学科: 医学
• 关键词: FRACTIONAL SYNTHESIZER Time DELAY Tanlock LOOP REGISTER ADAPTATION
• 年，卷（期）: 2009,（9）
• 页码范围: 879-887
• 页数: 9页
• 分类号: R73

摘要

This paper presents an efficient indirect fractional frequency synthesizer architecture based on the time delay digital tanlock loop. The indirect type frequency synthesis systems incorporate a low complexity high performance adaptation mechanism that enables them to remain in a locked state following the division process. The performance of the proposed fractional-N synthesizer under various input conditions is demonstrated. This includes sudden changes in the system input frequency as well as the injection of noise. The results of the extensive set of tests indicate that the fractional-N synthesizer, proposed in this work, performs well and is capable of achieving frequency divisions with fine resolution. The indirect frequency synthesizer also has a wide locking range and fast switching response. This is reflected by the system ability to regain its lock in response to relatively large variations in the input frequency within a few samples. The overall system performance shows high resilience to noise as reflected by the mean square error results.