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US 7,126,520 B2Granted
Segmented sawtooth generator
AssigneeAvago Technologies General IP (Singapore) Pte. Ltd.
InventorRobert T. Martin
Life of this patent
Estimating the term…
Abstract
Generation of segmented sawtooth waveforms. A desired waveform is divided into intervals. A slope is associated with each interval. A charge current representing the slope is applied to a timing capacitor during each interval. Responsive to a clock signal, a counter chain indexes a digital memory which provides values to a digital to analog converter. The output of the digital to analog converter drives an adjustable current source to charge the timing capacitor.
Claims8
A method of generating a segmented sawtooth waveform comprising:
- dividing the segmented sawtooth waveform into intervals;
- associating a slope with each interval of the segmented sawtooth waveform;
- consecutively storing a single value representative of the slope of each interval of the segmented sawtooth waveform to generate a series of stored values;
- consecutively retrieving the series of stored values;
- using a digital-to-analog converter to adjust a current source over time based on the series of stored values;
- and
- charging a timing capacitor from the current source.
4 more elements
A segmented sawtooth generator comprising:
- a counter responsive to a clock, the counter producing a multiple-channel counter output;
- a memory containing stored values representing slopes of a desired segmented sawtooth waveform the memory responsive to the multiple-channel counter output and generating a multiple-channel memory output;
- a digital-to-analog converter having a multiple-channel input coupled to the multiple-channel memory output and configured to produce an output signal representative of a slope responsive to a current segment of the desired segmented sawtooth waveform;
- an adjustable current source controlled by the digital-to-analog converter output signal;
- and
- a timing capacitor charged by the adjustable current source.
3 more elements
Dependencies are inferred from the claim text.