SERRASOID GENERATION FOR EXTENDED-RANGE FREQUENCY MODULATION,
Abstract
Wideband frequency-modulated signals may be produced by an extension of the Armstrong method if suitable cosine phi and sine phi waveforms are generated, where phi is the phase of the modulated signal. The generation of these involves complex and expensive circuitry in which parameters must be continuously and accurately varied. It is possible to first generate serrasoidal waveforms analogous to cosine phi and sine phi which can be converted to the latter. Such serrasoidal signals could conceivably be simple to generate, since corresponding circuitry involves only integrators, threshold detectors, and polarity-switching gates; circuits which are linear except during brief switching periods. Two esperimental serrasoid generators were constructed whose designs are described. Adverse response to small input signals occurred, and appear inherent to the technique. This response, and the relative complexity of suitable polarity-switching gates indicate that the described approach cannot favorably compare with more conventional frequency-modulation schemes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1970
- Accession Number
- AD0710832
Entities
People
- Robert John Kubala
Organizations
- University of Illinois Urbana–Champaign