Modulators – Pulse or interrupted continuous wave modulator – Pulse width modulator
Patent
1998-03-16
1999-10-05
Mis, David
Modulators
Pulse or interrupted continuous wave modulator
Pulse width modulator
332110, 375238, 327172, 327176, H03K 708
Patent
active
059631066
ABSTRACT:
In a double-sided pulse width modulator, an amplifier has a first input connected to a first reference potential, a second input, and an output. A first bank of storage elements have a first terminal connected to the second input of the amplifier, and a second terminal. A first bank of switches have an output terminal connected to a second terminal of the storage elements, an input terminal, and a control terminal connectable by a timing gate to an output of the modulator and a polarity control bit for a first value to be input into the input terminals. A feedback storage element is connected in parallel with a first timing switch between the second input of the amplifier and the output of the amplifier. A comparator has a first input connected to a second reference potential, a second input, a timing enable input, and an output. A second bank of storage elements have a first terminal connected to the second input of the comparator, and a second terminal. A second timing switch is connected in parallel with a first one of the storage elements of the second bank of storage elements between the output of the amplifier and the second input of the comparator. A second bank of switches have a first terminal connected to one of the storage elements in the second bank of storage elements other than the one storage element, a second terminal connected to the output of the amplifier, and a control terminal connected to a second input value. A current source is connected to the second input of the comparator to discharge a value having a duration proportional to the product of the first input value and the second input value to form the output of the modulator at the output of the comparator.
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Blyth Trevor A.
Nise Benjamin E.
Wayne David A.
Mis David
Sonic Innovations, Inc.
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