Analog pulse-width-modulation control circuits
AssigneeX Display Company Technology Limited
InventorsRonald S. Cok, Robert R. Rotzoll, Matthew Alexander Meitl
Life of this patent
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Abstract
An analog pulse-width-modulation circuit comprises an analog storage circuit, a load circuit responsive to control signals to load (e.g., store analog information in) the analog storage circuit, a discharge circuit that discharges the analog storage circuit over time, a constant-current supply providing a constant current, a digital switch responsive to the discharge circuit that switches the constant current, and a functional element connected to the digital switch that operates in response to the constant current. The analog pulse-width-modulation circuit can comprise an output control circuit that isolates or connects the discharge circuit from the analog storage circuit.
Claims20
An analog pulse-width-modulation circuit, comprising:
- an analog storage circuit;
- a load circuit responsive to control signals to load the analog storage circuit;
- a discharge circuit operable to discharge the analog storage circuit over time;
- a constant-current supply that provides a constant current;
- a digital switch responsive to the discharge circuit to switch the constant current;
- and
- a functional element connected to the digital switch that operates in response to the constant current when provided.
Dependencies are inferred from the claim text.