Digital Synthesizer and Code Generator.
Abstract
The objective of this program was to design, fabricate, and test two building block modules for application to digital modems. The two modules selected for implementation were a digital code generator operating to 20 Mb/s and a digital synthesizer providing a 25-kHz bandwidth centered at 200 kHz, with a frequency resolution of 4 Hz. Both the code generator and frequency synthesizer modules were implemented using the silicon-gate CMOS/SOS technology. The code generator array contains a 16-stage sequence generator capable of being operated with various code lengths from 1 to 16 stages. The code generator operates at 20 Mb/s output rates at 10 V with approximately 105 mW of power dissipation. At 5 V the generator operates at 10 Mb/s with 10 mW of dissipation. The digital synthesizer LSI array that was designed under this program is coupled to a phase-locked loop and output bandpass filter to form the synthesizer module. Mounted on a 4.5 inch by 8.5 inch printed circuit card, the synthesizer module provides for the generation of 419,430 frequencies over the 25-kHz band of interest. The frequency resolution of the delivered synthesizer is 0.0596 Hz, compared to the Government's original requirement for resolution of 4 Hz. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1976
- Accession Number
- ADA040156
Entities
People
- H. W. Kaiser
- J. I. Pridgen
- W. E. Arrowood
- W. F. Gehweiler