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US 2006/0187103 A1Published application
Serial audio output driver circuits and methods
AssigneeCirrus Logic, Inc.
InventorsJoseph Welser, Johann Gaboriau
Life of this patent
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Abstract
An output driver circuit including a transistor for pulling down an output terminal voltage and a charge pump for driving an input of the transistor to pull-down the output terminal voltage substantially to zero volts in response to a selected level of an input signal.
Claims20
An output driver circuit comprising:
- a transistor for controlling an output terminal voltage;
- and
- a charge pump for driving an input terminal of the transistor to pull-down the output terminal voltage to substantially zero volts in response to a voltage level of an input signal.
A method driving an output terminal comprising:
- selectively pulling-down an output terminal voltage substantially to zero volts with a transistor in response to a selected level of an input signal with a charge pump driving an input terminal of the transistor.
An audio integrated circuit comprising:
- a serial audio output driver for minimizing noise transfer from the serial audio output driver to another circuit formed on a substrate with the serial audio output driver, the serial audio output driver comprising:
- a first p-type metal oxide semiconductor (PMOS) transistor for pulling-up an output voltage at an output terminal of the integrated circuit in response to a first level of a serial audio output signal;
- and
- a second PMOS transistor for pulling-down the output voltage at the output terminal in response to a second level of the serial audio output signal.
1 more element
Dependencies are inferred from the claim text.