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US 6,211,728 B1Granted
Modulation scheme for filterless switching amplifiers
AssigneeTexas Instruments Incorporated
InventorsWayne Tien-Feng Chen, Marco Corsi, Roy Clifton Jones, III, Michael David Score
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Abstract
A Class-D switching amplifier (20) having a terinary modulation scheme implemented in an H-bridge configuration. The present invention has four states of operation, and achieves increased efficiency and reduced cost by delivering current to the load only when needed, and once delivered, maintaining the current. The Class-D switching amplifier eliminates the need for post amplifier filters.
Claims20
A Class-D switching amplifier, comprising:
- a first, second, third and fourth switch each having a respective control terminal, a first output terminal disposed between said first switch and said second switch, and a second output terminal disposed between said third switch and said fourth switch;
- and
- a control circuit coupled to each said control terminals and pulse and width modulating (PWM) said four switches such that no voltage differential is generated between said first output terminal and said second output terminal in a first state of operation for a first predetermined time period.
A Class-D switching amplifier, comprising:
- a first switch and a second switch coupled in series between a first voltage potential and a second voltage potential, a third switch and a fourth switch coupled in series between said first voltage potential and said second voltage potential, a first output terminal defined between said first and second switches, a second output terminal defined between said third and fourth switches, each said switch having a control terminal;
- and
- a control circuit coupled to each said control terminals pulse width modulating (PWM) said four switches such that no voltage differential is generated between said first output terminal and said second output terminal in a first state of operation for a first predetermined time period.
Dependencies are inferred from the claim text.