Digital frequency synthesizer

Details Digital frequency synthesizer Digital frequency synthesizer

H - Electricity

03

K

354/137

H03K 3/64 (2006.01)

Patent

CA 1112767

DIGITAL FREQUENCY SYNTHESIZER Abstract of the Disclosure A digital frequency synthesizer is disclosed wherein a series of binary level signals are produced, the level of such signals changing at a frequency related to a selected frequency f. The synthesizer includes a counter which counts clock pulses fed thereto at a pulse repetition frequency fcp producing a first digital word representative of the number counted clock pulses. An adder cumulatively adds a second digital word representative of fcp/nf, where n is an even integer, each time the whole number portion of the cumulatively added second digital word equals the first digital word. A comparator produces a control signal indicative of whether the whole number portion of the cumulatively added second digital word is equal to the first digital word. A flip/flop, responsive to the control signal, produces a binary level signal, the level of such signal changing at a frequency related to the frequency f.

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