Circuits and methods for controlling transients du

专利名称：Circuits and methods for controlling

transients during audio device power-up andpower-down, and systems using the same

发明人：Xiaomin Wu,Joseph Jason Welser,Krishnan

Subramaniam

申请号：US09764200申请日：20010117公开号：US06774684B2公开日：20040810

专利附图：

摘要：Circuitry for ramping a voltage across a load includes a charging circuit for

charging a capacitor to generate a ramp-up wave form. Circuitry selectively decouples afirst driver from load during a ramping up mode and couples first driver to load during anormal operating mode. Ramp up driver is selectively coupled to the load during theramp-up mode for ramping up the voltage across load in response to the ramp-up waveform generated by charging circuitry . A discharge circuit discharges capacitor togenerate a power-down wave form. Circuitry selectively decouples a first driver fromoutput load during the ramping down of the voltage across output load . A ramp-downdriver selectively ramps-down the voltage across output load in response to the ramp-down wave form generated by discharge circuitry

申请人：CIRRUS LOGIC, INC.

代理机构：Thompson & Knight LLP

代理人：James J. Murphy

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