公开(公告)号：EP1576725A4

公开(公告)日：2008-03-26

申请号：EP03794600

申请日：2003-09-04

申请人： CIRRUS LOGIC INC

发明人： MELANSON JOHN LAURENCE ,  FEI XIAOFAN ,  GABORIAU JOHANN GUY ,  GREEN STEVEN ,  RHODE JASON P ,  WALBURGER ERIC ,  TAYLOR WILSON E JR

IPC分类号： H03G3/00 ,  H03F1/52 ,  H03F3/04 ,  H03F3/217

CPC分类号： H03F3/2175 ,  H03F1/52 ,  H03F3/2173 ,  H03F2200/331 ,  H03F2200/447

摘要： A thermal sensor at the output of a switching amplifier senses heat dissipation at the output switch. If an overheating condition is sensed, gain of the digital input signal is lowered to reduce output power of the audio output signal.

公开(公告)号：EP1543612A4

公开(公告)日：2007-06-06

申请号：EP03756794

申请日：2003-09-04

申请人： CIRRUS LOGIC INC

发明人： MELANSON JOHN LAURENCE ,  FEI XIAOLAN ,  GABORIAU JOHANN GUY ,  GREEN STEVEN ,  RHODE JASON P

IPC分类号： H03M7/32 ,  H03F1/32 ,  H03F3/181 ,  H03F3/217 ,  H03G3/30 ,  H03G7/00 ,  H03G3/10 ,  H03G3/18

CPC分类号： H03G7/007 ,  H03F3/181 ,  H03F3/217 ,  H03F2200/03 ,  H03F2200/331 ,  H03F2200/351 ,  H03G3/3089

摘要： A gain control (12) at the input monitors an input signal (DIGITAL INPUT) and a supply voltage (V+), which drives an output. The gain control (12) adjusts the gain to compress the input signal when the supply voltage decreases in magnitude and/or the input is of such magnitude to cause the supply voltage to decrease.