公开(公告)号：US20020094091A1

公开(公告)日：2002-07-18

申请号：US09764200

申请日：2001-01-17

Applicant: Cirrus Logic, Inc.

Inventor： Xiaomin Wu ,  Joseph Jason Welser ,  Krishnan Subramaniam

IPC: H04R029/00 ,  H04R003/00

CPC classification number: H03F3/181 ,  H03F2203/7236 ,  H03G3/348

Abstract: Circuitry for ramping a voltage across a load 506 includes a charging circuit 500 for charging a capacitor 501 to generate a ramp-up wave form. Circuitry 511 selectively decouples a first driver 510 from load 506 during a ramping up mode and couples first driver 510 to load 506 during a normal operating mode. Ramp up driver 507a is selectively coupled to the load 506 during the ramp-up mode for ramping up the voltage across load 506 in response to the ramp-up wave form generated by charging circuitry 500. A discharge circuit 503d, 514a,b discharges capacitor 501 to generate a power-down wave form. Circuitry 511 selectively decouples a first driver 501 from output load 506 during the ramping down of the voltage across output load 506. A ramp-down driver 507b selectively ramps-down the voltage across output load 506 in response to the ramp-down wave form generated by discharge circuitry 503d, 514a,b.

Abstract translation: 用于使负载506上的电压斜升的电路包括用于对电容器501充电以产生斜升波形的充电电路500。 电路511在升降模式期间选择性地将第一驱动器510与负载506分离，并且在正常操作模式期间将第一驱动器510耦合到负载506。 斜坡上升驱动器507a在斜坡上升模式期间选择性地耦合到负载506，以响应于由充电电路500产生的斜升波形而升高负载506上的电压。放电电路503d，514a，b放电电容器 501产生掉电波形。 电路511在跨越输出负载506的电压下降期间选择性地将第一驱动器501与输出负载506分离。斜坡下降驱动器507b响应于产生的斜降波形而选择性地斜升输出负载506两端的电压 通过放电电路503d，514a，b。