Invention Grant
- Patent Title: Apparatus and method for a smooth powerup of a reference signal
- Patent Title (中): 用于参考信号平滑加电的装置和方法
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Application No.: US12860791Application Date: 2010-08-20
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Publication No.: US08212608B2Publication Date: 2012-07-03
- Inventor: Christian Larsen , Gomathi Komanduru , Lorenzo Crespi
- Applicant: Christian Larsen , Gomathi Komanduru , Lorenzo Crespi
- Applicant Address: US CA Newport Beach
- Assignee: Conexant Systems, Inc.
- Current Assignee: Conexant Systems, Inc.
- Current Assignee Address: US CA Newport Beach
- Agency: Jackson Walker L.L.P.
- Agent Christopher J. Rourk
- Main IPC: G05F1/10
- IPC: G05F1/10 ; G05F3/02

Abstract:
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 or 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.
Public/Granted literature
- US20120044023A1 Apparatus and Method for a Smooth Powerup of a Reference Signal Public/Granted day:2012-02-23
Information query
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