Development of a Digitally Compensated Saw Oscillator (DCSO) to Provide Temperature Stable Frequency.
Abstract
A single circuit board Digitally Compensated SAW (Surface Acoustic Wave) Oscillator(DCSO) running at 300 MHz demonstrated 30 parts per million temperature stability over a portion of its temperature range. A thick film hybrid controller circuit, for use in the DCSO, was designed and tested. This circuit, referred to as the AFIT IC, consists of two commercial TTL prescalers and a custom NMOS integrated circuit. The TTL prescaler circuits of the AFIT IC were found to be operational, but the failure of the NMOS controller IC to meet design criteria prevented demonstration of a fully integrated DCSO. Off board control circuitry was designed, using portions of the AFIT IC (including part of the NMOS chip), to continue the project. The DCSO was then calibrated and tested over a 0 to 70 degrees Centigrade range. Calibration and testing were facilitated by computer interfaces to the DCSO, and electronic thermometer, and a frequency counter. Despite erroneous temperature behavior of one oscillator loop, compensation to within 30 parts per million over a portion of the temperature range was accomplished for the 300 MHz DCSO. Originator-supplied keywords include: Crystal oscillators, Oscillators, Surface waves, Acoustic waves, Frequency stabilizers, Compensation, and Phase shift circuits. (Thesis).
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1984
- Accession Number
- ADA151907
Entities
People
- W. D. Cowan
Organizations
- Air Force Institute of Technology