Back to results
US 8,970,280 B2Granted
Input clamping structure for sound quality improvement in car-radio class-AB power amplifier design
AssigneeSTMicroelectronics (Shenzhen) R&D Co. Ltd
InventorsMei Yang, YueHua Wang, Xaut Zhang, Kelvin Wen, XiangSheng Li
Life of this patent
Estimating the term…
Abstract
A clamping circuit for a class AB amplifier includes a reference voltage circuit, four NPN Darlington transistors having inputs coupled to the reference voltage circuit, and outputs for providing four clamped voltages, and a split NPN Darlington transistor having an input coupled to the reference voltage circuit, and four separate outputs for providing four AC ground voltages.
Claims20
A clamping circuit comprising:
- a reference voltage circuit;
- a plurality of Darlington transistors having a plurality of inputs coupled to the reference voltage circuit, and a plurality of outputs for providing a plurality of clamped voltages;
- and
- a split Darlington transistor comprising
- a first transistor and a second transistor coupled together in a Darlington configuration,
- at least one third transistor coupled to the second transistor,
- the first transistor, second transistor and at least one third transistor having inputs coupled to the reference voltage circuit, and
- the second transistor and at least one third transistor having a plurality of outputs for providing a plurality of AC ground voltages.
5 more elements
A circuit comprising:
- a reference voltage circuit;
- a plurality of Darlington transistors having a plurality of inputs coupled to the reference voltage circuit, and a plurality of outputs for providing a plurality of clamped voltages;
- and
- a split Darlington transistor comprising
- a first transistor and a second transistor coupled together in a Darlington configuration,
- at least one third transistor coupled to the second transistor,
- the first transistor, second transistor and at least one third transistor having inputs coupled to the reference voltage circuit, and
- the second transistor and at least one third transistor having a plurality of outputs configured to provide a plurality of AC reference voltages.
5 more elements
Dependencies are inferred from the claim text.