My 2008 textbook shipped with a CD that had the actual MATLAB scripts that I used to compute/plot every figure in the book. Several written appendices were also made available on the CD, and these have been up-loaded to the Papers section of the site ( Appendix 6C, 6D, and 7A, all under Phase-Locked Loops). You will have to register, however, in order to get access to these selections.
This topic comes up rather frequently. I have addressed this in a lot of detail in a paper titled “Digital Redesign of Analog Phase-Locked Loops” and it is available on this site under the PLL section. You will need to sign-up, however, to gain access to this article that appears on the “Subscription Papers” tab.
The minimum acceptable gain- and phase-margin depends upon your application of course. Phase margin is generally more critical unless wide variations in loop-gain are expected (due to large changes in the feedback divider ratio, VCO tuning sensitivity, or equivalent).
Small phase margin always leads to (i) phase noise peaking in the frequency domain and (ii) extended transient response in the time domain.
Just as a point of reference, a speed-optimized type-2 PLL using a sample-and-hold phase detector can theoretically change frequencies in only 2 sample periods. This speed comes at a cost, however. The gain-margin is only about 2.5 dB and the phase-margin is only 23.9 degrees for this speed-optimized case. This is all discussed in Chapter 7 of my 2008 textbook. Some other helpful references include the following:
Tutorial on PLLs, Part I, James A Crawford
Tutorial on PLLs, Part II, James A Crawford
Under the tab “More Articles” are a number of additional papers including:
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“Digital Redesign of Continuous-Time Phase-Locked Loops,” J.A. Crawford, April 2005.
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“Phase-Locked Loops- A Broad Perspective (Part I). ” J.A. Crawford, May 2004.
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“Phase-Locked Loops- A Broad Perspective (Part II).” J.A. Crawford, May 2004.
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Appendix 6C from 2008 text Advanced Phase-Lock Techniques
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Appendix 6D from 2008 text Advanced Phase-Lock Techniques
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Appendix 7A from 2008 text Advanced Phase-Lock Techniques
Are you like me, thinking that the price of most technical books has just gotten out of hand? My 2008 textbook lists for $139, but you can buy it at discount on Amazon for $119. That is still a lot of cash. If a book like that was selling for say $59, would you be more inclined to buy a copy? I’d like to hear people’s opinions as I am purposely intending to self-publish my next book so that I can keep the retail price more reasonable.
I was able to get most of the site up over the weekend except for the project section. If you see any broken links, misspelled words, etc., I would appreciate hearing from you!
Welcome to the site. This is a major revision that will unfold over the next few weeks.
Enjoy!
