Dear Dennis... analogZONE's Dennis Feucht answers your design queries in his new Circuit Design Clinic! October 2006

analogZONE presents a new, interactive analog design service to readers! Send us your design questions (with relevant data; schematics in JPEG or GIF, please) for some free engineering advice from analogZONE's circuit consultant, Dennis Feucht, on how you might solve a design problem or improve circuit performance. Submissions may be edited for clarity or brevity, and submitters and their email addresses will remain anonymous (unless otherwise indicated). Please send your questions to Dennis here.

Mixed-Technology Laser System, Part 3

The June 2006 installment covered some problems with a medical laser design. September 2006 addressed more of the feedback loop design.

Problem:

Design the dynamic compensation of a Nd YAG laser power control loop, to achieve a stable loop within the static error (accuracy) requirements.

Solution:

The control loop dynamic-response requirements were a 20 Hz maximum pulse rate and a 50 ms minimum pulse duration.

Read the entire solution here (35 kb Adobe Acrobat PDF file)