Abstract
A Motorola M58HC11EVB board [1] is used in the design of a frequency synthesiser using a fractional phase-locked loop technique which synthesises frequencies that are integer plus fractional times higher than the reference frequency. The method uses a 68HC11 microprocessor to generate very stable reference frequencies [1]. A software program is designed to give great flexibility in selecting the reference over a desired operating range of frequencies. The ability to operate at low reference frequencies (≈10 Hz) enables the system to step in 1 Hz increments. A frequency synthesiser over the bands of 10–150 Hz, 100–1500 Hz, 1–15 kHz, and 10–150 kHz in steps of ±1 Hz, ±10 Hz, ±100 Hz and ± 1 kHz, respectively, is accomplished. The spectrum purity of the waveform for different frequencies is measured. Sideband frequencies of up to 50 dB below the synthesised frequency are observed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: IEE Proceedings A Science, Measurement and Technology
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
