Invention Grant
- Patent Title: Linear regulator with improved power supply rejection
- Patent Title (中): 线性稳压器,具有改进的电源抑制
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Application No.: US11881457Application Date: 2007-07-27
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Publication No.: US07688051B1Publication Date: 2010-03-30
- Inventor: Kan Li , Kee Hian Tan
- Applicant: Kan Li , Kee Hian Tan
- Applicant Address: BM Hamilton
- Assignee: Marvell International Ltd.
- Current Assignee: Marvell International Ltd.
- Current Assignee Address: BM Hamilton
- Main IPC: G05F1/00
- IPC: G05F1/00

Abstract:
A linear regulator for outputting a regulated voltage with improved rejection of high frequency components in the power supply. The linear regulator includes an op-amp connected in a linear feedback loop to drive first and second current legs based on a voltage reference. An output driver includes a load capacitance across which the regulated voltage is output, and further includes a ratio-driven current mirror having a mirror ratio defined by relative sizes of active devices in the first and second current legs, as compared with relative sizes of active devices in the output driver. Because the output driver and its load capacitance are provided outside the linear feedback loop, large values for the load capacitance can be selected without destabilization of the feedback loop. Thus, the value of the load capacitance can be chosen at any value according to frequency rejection requirements.
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