[time-nuts] lecture on PLL and phase noise and verilog

jimlux jimlux at earthlink.net
Mon May 14 08:47:12 EDT 2018

If you're in California southern Central Coast area (Ventura, Santa 
Barbara, Thousand Oaks, etc.) the local IEEE chapter is sponsoring a 
talk on phase noise and Verilog


Verilog is the accepted language of choice for modeling and simulating 
digital designs. For analog blocks the tool choice is a low level 
circuit simulator like HSPICE or Spectre. For PLL’s a common 
misconception is that you can use Verilog to model a PLL if you don't 
care about accuracy, but if you do care about precision, you'll need an 
analog circuit simulator like HSPICE or Spectre. Various options like 
Verilog-A and Verilog-AMS are attempts to achieve the best of both 
worlds, but in this talk, we propose that the tool of choice for 
modeling and studying PLL’s and is plain “digital” Verilog. It's the 
right tool, but almost always used the wrong way for modeling PLL's. 
Understanding how the underlying simulation engine in Verilog works 
enables us to set up our models in a very precise, yet very simple 
manner. The efficiency and speed of Verilog allows us to literally watch 
our PLL designs come alive in the time domain with timing accuracy that 
can't be achieved in an analog circuit simulator. Watching designs 
operate in the time domain crystalizes our understanding of them, and 
enables us to study and quantify transient and other non-linear phenomena.


Greg Warwar received a master’s degree in electrical engineering from 
Rice University in 1989. Following graduation, he joined Texas 
Instruments in Dallas, TX as a member of the technical staff where he 
worked on ΣΔ analog to digital converters for precision audio 
applications. In 1992, he joined Vitesse Semiconductor in Camarillo, CA 
where he worked for 23 years on high speed serial communications IC’s, 
focusing on many areas of analog and mixed-signal design including 
VCO’s, phase locked loops, clock recovery, frequency synthesizers, and 
adaptive equalization. Since 2015, Greg has been a principal engineer in 
the mixed-signal ASICs design group at Teradyne, Inc. in Agoura Hills, 
CA. Greg holds six U.S. patents in the area of CMOS mixed-signal IC design.

More information about the time-nuts mailing list