A Digital Frequency Synthesizer for an AM and FM Receiver

This paper describes the design of a relatively economical, single crystal, frequency synthesizer that generates the required local oscillator frequencies for an AM and FM broadcast receiver. Selection of a station is accomplished by positioning switches to indicate the station's frequency. Fine tuning is not necessary. The receiver will not (for all practical purposes) drift, because the local oscillator frequency is crystal controlled. Low cost medium scale integrated circuits (MSI) are the building block of this synthesizer.