Variable digital frequency generator with value storage

Details Variable digital frequency generator with value storage Variable digital frequency generator with value storage

H - Electricity

03

K

328/98

H03K 3/64 (2006.01) H03L 7/099 (2006.01)

Patent

CA 1216032

Abstract Characteristics of a pulse sequence, such as frequency, are controlled in a simple circuit without requirement for specific storage components. The cumulative effect of a sequence of control signals is maintained by providing a phase shift between a pair of waveforms. The phase shift between the waveforms is used to provide a number of control pulses to the circuit for varying the desired characteristic. In a particular embodiment, control signals are externally provided for varying the phase shift between two waveforms. In response to the phase variation, a number of control signals are provided for adding or deleting pulses to a pulse stream. The use of feedback control loops results in repeated addition and/or deletion of pulses to or from the pulse stream, thereby varying the output frequency in accordance with a one time input of the external control signals. Serial or parallel control signals may be provided, and ripple counters (or a combination of ripple and presettable counters) may be used for the frequency control function.

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