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Design of a fractional phase locked-loop frequency synthesiser using a Motorola based microcontroller

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3 Author(s)
Rizkalla, M.E. ; Dept. of Electr. Eng., Purdue Univ., Indianapolis, IN, USA ; Gundrum, H. ; Michel, H.

A Motorola M58HC11EVB board 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. 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 ( approximately=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 +or-1 Hz, +or-10 Hz, +or-100 Hz and +or-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.

Published in:

Science, Measurement and Technology, IEE Proceedings A  (Volume:138 ,  Issue: 6 )

Date of Publication:

Nov 1991

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