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Abstract

A digital frequency generating device is comprised of a first digital frequency generator which generates a first output signal at a first frequency and a second digital frequency generator which generates a second output signal at a second frequency independent of the first frequency. Both the first and the second frequency generators run continuously and either can be connected to the generating device output by means of a multiplexer. Apparatus is provided to synchronize the two generators so that a continuous phase transition is maintained when the generating device output switches from the first output signal to the second output signal. This arrangement allows the device output to be shifted from a first frequency to a second frequency and then return to the first frequency output while maintaining the phase position of the first frequency output and is particularly useful in nuclear magnetic resonance applications.

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First Claim