Invention Grant
- Patent Title: Differential low frequency noise suppression technique for a common mode feedback circuit
- Patent Title (中): 用于共模反馈电路的差分低频噪声抑制技术
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Application No.: US12476132Application Date: 2009-06-01
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Publication No.: US07834697B1Publication Date: 2010-11-16
- Inventor: Ronald J. Lipka
- Applicant: Ronald J. Lipka
- Applicant Address: US CA Milpitas
- Assignee: LSI Corporation
- Current Assignee: LSI Corporation
- Current Assignee Address: US CA Milpitas
- Agency: Cochran Freund & Young LLC
- Agent William W. Cochran
- Main IPC: H03F3/45
- IPC: H03F3/45
Abstract:
Disclosed is a common mode feedback circuit for a differential amplifier that eliminates the effects of low frequency noise. A modulator is placed in a common mode feedback loop that modulates the feedback loop signal at a predetermined frequency to up-convert the low frequency noise. The predetermined frequency may be selected to be above the operating range of the downstream circuitry. In addition, a low pass filter can be used to eliminate the up-converted noise.
Public/Granted literature
- US20100301936A1 DIFFERENTIAL LOW FREQUENCY NOISE SUPPRESSION TECHNIQUE FOR A COMMON MODE FEEDBACK CIRCUIT Public/Granted day:2010-12-02
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