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US 11,563,444 B1Granted
Suppressing spurious signals in direct-digital synthesizers
AssigneeTextron Systems Corporation
InventorJames Joseph Jaklitsch
Life of this patent
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Abstract
A technique for generating analog waveforms includes combining a desired, in-band signal with a randomizing, out-of-band signal at an input of a DAC, operating the DAC to generate DAC output based on a combination of the desired signal and the randomizing signal, and filtering the DAC output to pass the desired signal while removing the randomizing signal.
Claims20
A method of generating analog waveforms, comprising:
- combining a first digital signal with a second digital signal at an input of a DAC (digital-to-analog converter), the first digital signal representing a desired output waveform, the second digital signal providing randomizing content;
- operating the DAC to generate DAC output based on a combination of the first digital signal and the second digital signal;
- and
- filtering the DAC output to pass the desired output waveform while removing the randomizing content.
1 more element
A direct digital synthesizer (DDS), comprising:
- a combiner having a first input configured to receive a first digital signal, a second input configured to receive a second digital signal, and an output configured to provide a combined digital signal, the first digital signal representing a desired output waveform, the second digital signal providing randomizing content;
- a DAC having an input configured to receive the combined digital signal and an output configured to provide an analog representation of the combined digital signal;
- and
- a filter coupled to the output of the DAC, the filter configured to pass the desired output waveform and to remove the randomizing content.
1 more element
A DAC (digital-to-analog converter) circuit, comprising:
- a combiner configured to combine a first digital signal with a second digital signal to produce a combined signal, the first digital signal representing a desired output waveform, the second digital signal providing randomizing content;
- a DAC coupled to the combiner, the DAC configured to generate DAC output based on the combined signal;
- and
- a filter coupled to the DAC and configured to filter the DAC output by passing the desired output waveform while removing the randomizing content.
1 more element
Dependencies are inferred from the claim text.