A Digitally Tuned AM/FM Radio.

This report describes the design and operation of a relatively economical, single crystal, frequency synthesizer that generates the required local oscillator frequencies for commercial AM and FM broadcast receivers. Selection of a desired station is accomplished by electronic programming using pushbutton control. FIne tuning is not necessary. Receiver frequency drift is not significant because the local oscillator frequency is crystal controlled. Low-cost medium-scale integrated circuits and a large-scale integrated circuit LSI are the building blocks of this synthesizer. Frequency synthesis techniques, elements of the system design and experimental results are also presented. Author