APPARATUS AND METHOD FOR A SMOOTH POWERUP OF A REFERENCE SIGNAL
摘要
<p>A circuit for providing a reference voltage can be widely used in audio applications. However, at startup an abrupt start in the reference signal can cause undesirable audible artifacts. A circuit employing feedback of a reference voltage to control the charging of a capacitor which provides the reference voltage can be used to provide a smooth startup to the reference voltage. The circuit contains a differential pair for steering a fixed current source from one path to another as the reference voltage increases. The steered current can then be mirrored into one ore more current mirrors where the newly mirrored current can be squeezed to zero when the difference between a desired reference voltage and the reference voltage approaches zero. This newly mirrored current can be used to charge a capacitor which is used to provide the reference voltage.</p>
申请公布号
WO2012024429(A1)
申请公布日期
2012.02.23
申请号
WO2011US48122
申请日期
2011.08.17
申请人
CONEXANT SYSTEMS, INC., A DELAWARE CORPORATION;LARSEN, CHRISTIAN;KOMANDURU, GOMATHI;CRESPI, LORENZO
发明人
LARSEN, CHRISTIAN;KOMANDURU, GOMATHI;CRESPI, LORENZO