Asymmetrical ramp generator system
AssigneeAnalog Devices, Inc.
InventorEdward P. Jordan
Life of this patent
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Abstract
An asymmetrical ramp generator system for a pulse width modulator includes a complementary clock circuit; a first symmetrical dual ramp generator, responsive to the clock circuit, for generating first and second ramps having a predetermined voltage range and extending for a period equal to or greater than one half the clock cycle; a comparator device, responsive to the first and second symmetrical ramps and to a reference level within the predetermined voltage range of the first and second ramps, for generating corresponding dual first and second asymmetrical drive signals; and a second asymmetrical dual ramp generator, responsive to the first and second asymmetrical drive signals, for generating third and fourth asymmetrical overlapping ramps which extend beyond the predetermined voltage range.
Claims12
An asymmetrical ramp generator system for a pulse width modulator, comprising:
- a complementary clock circuit;
- a first symmetrical dual ramp generator, responsive to said clock circuit, for generating first and second ramps having a predetermined voltage range and extending for a period equal to or greater than one half the clock cycle;
- a comparator device, responsive to each of said first and second symmetrical ramps and to a reference level within said predetermined voltage range of said first and second ramps, for generating corresponding dual first and second asymmetrical drive signals;
- and
- a second asymmetrical dual ramp generator, responsive to said first and second asymmetrical drive signals, for generating third and fourth asymmetrical overlapping ramps which extend beyond said predetermined voltage range.
Dependencies are inferred from the claim text.