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Us Patents
Digital Pulse Width Modulated Feedback System For A Switching Amplifier And Method Therefor
Pallab Midya - Palatine IL, US Theresa Paulo - Schaumburg IL, US William J. Roeckner - Carpentersville IL, US
International Classification:
H03F 3/38
US Classification:
330 10
Abstract:
A switching amplifier includes a power stage, a low pass filter, a combining circuit, and a feedback correction circuit. The power stage has an input terminal and an output terminal. The low pass filter has an input terminal coupled to the output terminal of the power stage, and an output terminal for providing a filtered pulse width modulated signal. The combining circuit has a first input terminal coupled to the output terminal of the power stage, a second input terminal coupled to the output terminal of the low pass filter, and an output terminal. The feedback correction circuit has a first input terminal for receiving a reference pulse width modulated signal, a second input terminal coupled to the output terminal of the combining circuit, and an output terminal coupled to the input terminal of the power stage.
Asynchronous Error Correction Circuit For Switching Amplifier
Pallab Midya - Palatine IL, US Matthew R. Miller - Arlington Heights IL, US Theresa Paulo - San Jose CA, US William J. Roeckner - Carpentersville IL, US
Assignee:
Freescale Semiconductor, Inc. - Austin TX
International Classification:
H03F 3/217
US Classification:
330251, 375238
Abstract:
A circuit () includes a comparison circuit () and a correction circuit (). The comparison circuit provides a comparison signal () in response to an error value () and a reference value (). The error value is based on a pulse modulated input signal () and a pulse modulated output signal (). The correction circuit asynchronously provides a corrected pulse modulated signal () by selectively delaying and advancing an edge of the pulse modulated input signal based on the comparison signal. The pulse modulated output signal is based on the corrected pulse modulated signal.
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