Invention Grant
US09209757B1 Energy-efficient personal audio device output stage with signal polarity-dependent power supply update rate
有权
具有信号极性相关电源更新速率的节能个人音响设备输出级
- Patent Title: Energy-efficient personal audio device output stage with signal polarity-dependent power supply update rate
- Patent Title (中): 具有信号极性相关电源更新速率的节能个人音响设备输出级
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Application No.: US14067485Application Date: 2013-10-30
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Publication No.: US09209757B1Publication Date: 2015-12-08
- Inventor: Bharath Kumar Thandri , John L. Melanson
- Applicant: Cirrus Logic, Inc.
- Applicant Address: US TX Austin
- Assignee: Cirrus Logic, Inc.
- Current Assignee: Cirrus Logic, Inc.
- Current Assignee Address: US TX Austin
- Agency: Jackson Walker L.L.P.
- Main IPC: H03F99/00
- IPC: H03F99/00 ; H03F3/181
Abstract:
A charge pump power supply may comprise a plurality of capacitors and a switching circuit for switching the capacitors to provide a first voltage or a second voltage in accordance with the select input. The charge pump power supply may have a signal polarity input for indicating a polarity of an output audio signal. Switches for switching one or more capacitors providing a first polarity voltage in a then-current operating mode may be configured to switch at a greater frequency than switches for switching one or more capacitors providing a second polarity voltage responsive to the signal polarity input indicating a positive polarity of the output audio signal. Switches for switching one or more capacitors providing the first polarity voltage in a then-current operating mode are configured to switch at a lesser frequency than switches for switching one or more capacitors providing the second polarity voltage responsive to the signal polarity input indicating a negative polarity of the output audio signal.
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