锁相环
參考資料

↑  Christiaan Huygens, Horologium Oscillatorium … (Paris, France:  F. Muguet, 1673),  pages 18–19.  From page 18:  " … illudque accidit memoratu dignum, … brevi tempore reduceret." ( … and it is worth mentioning, since with two clocks constructed in this form and which we suspend in like manner, truly the cross beam is assigned two fulcrums [i.e., two pendulum clocks were suspended from the same wooden beam]; the motions of the pendulums thus share the opposite swings between the two [clocks], since the two clocks at no time move even a small distance, and the sound of both can be heard clearly together always: for if the innermost part [of one of the clocks] is disturbed with a little help, it will have been restored in a short time by the clocks themselves.)  English translation provided by Ian Bruce's translation of Horologium Oscillatorium …  （页面存档备份，存于）, pages 16–17.
↑ See:
Lord Rayleigh, The Theory of Sound (London, England:  Macmillan, 1896), vol. 2.  The synchronization of organ pipes in opposed phase is mentioned in §322c, pages 221–222.
Lord Rayleigh (1907) "Acoustical notes — VII," Philosophical Magazine, 6th series, 13 :  316–333.  See "Tuning-forks with slight mutual influence," pages 322–323. （页面存档备份，存于）
↑ See:
Vincent (1919) "On some experiments in which two neighbouring maintained oscillatory circuits affect a resonating circuit," Proceedings of the Physical Society of London, 32, pt. 2, 84–91.
W. H. Eccles and J. H. Vincent, British Patent Specifications, 163 :  462 (17 Feb. 1920).
↑  E. V. Appleton (1923) "The automatic synchronization of triode oscillators," Proceedings of the Cambridge Philosophical Society, 21 (Part III): 231–248.  Available on-line at:  Internet Archive.
↑  Henri de Bellescize, "La réception synchrone," L'Onde Électrique (later: Revue de l'Electricité et de l'Electronique), vol. 11, pages 230–240 (June 1932).
↑  See also:  French patent no. 635,451 (filed: 6 October 1931; issued: 29 September 1932); and U.S. patent "Synchronizing system," （页面存档备份，存于） no. 1,990,428 (filed: 29 September 1932; issued: 5 February 1935).
↑  Notes for a University of Guelph course describing the PLL and early history, including an IC PLL tutorial 的存檔，存档日期2009-02-24.
↑  . Sxlist.com.   [2010-10-14]. （原始内容存档于2021-02-25）.
↑  A. B. Grebene, H. R. Camenzind, "Phase Locking As A New Approach For Tuned Integrated Circuits", ISSCC Digest of Technical Papers, pp. 100–101, Feb. 1969.
↑  Leonov, G. A.; Kuznetsov, N. V.; Yuldashev, M. V.; Yuldashev, R. V. . IEEE Transactions on Circuits and Systems I: Regular Papers (IEEE). 2015, 62 (10): 2454–2464. S2CID 12292968. arXiv:1505.04262 . doi:10.1109/TCSI.2015.2476295.
↑  Basab Bijoy Purkayastha; Kandarpa Kumar Sarma. . India: Springer (India) Pvt. Ltd. (Part of Springer Scinece+Business Media). 2015: 5. ISBN 978-81-322-2040-4.
1 2  M Horowitz; C. Yang; S. Sidiropoulos.  (PDF). IEEE Micro. 1998-01-01. （原始内容 (PDF)存档于2006-02-21）.
↑  Dixon, Robert, , CRC Press: 215, 1998, ISBN 0824701615
↑  Basab Bijoy Purkayastha; Kandarpa Kumar Sarma. . India: Springer (India) Pvt. Ltd. (Part of Springer Scinece+Business Media). 2015: 94. ISBN 978-81-322-2040-4.
↑  G. A. Leonov, N. V. Kuznetsov, M. V. Yuldashev, R. V. Yuldashev; Kuznetsov; Yuldashev; Yuldashev.  (PDF). IEEE Transactions on Circuits and Systems II: Express Briefs. 2012, 59 (10): 633–637  [2021-05-01]. S2CID 2405056. doi:10.1109/TCSII.2012.2213362. （原始内容存档 (PDF)于2021-01-20）.
↑  N.V. Kuznetsov, G.A. Leonov, M.V. Yuldashev, R.V. Yuldashev; Leonov; Yuldashev; Yuldashev. . ISSCS 2011 – International Symposium on Signals, Circuits and Systems, Proceedings. 2011: 7–10  [2021-05-01]. ISBN 978-1-61284-944-7. S2CID 30208667. doi:10.1109/ISSCS.2011.5978639. （原始内容存档于2021-02-26）.
↑  A. J. Viterbi, Principles of Coherent Communication, McGraw-Hill, New York, 1966