发明申请
- 专利标题: Creating Additional Phase Margin In The Open Loop Gain Of A Negative Feedback Amplifier System Using A Boost Zero Compensating Resistor
- 专利标题(中): 在使用升压零补偿电阻的负反馈放大器系统的开环增益中创建附加相位裕度
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申请号: US11764758申请日: 2007-06-18
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公开(公告)号: US20070241731A1公开(公告)日: 2007-10-18
- 发明人: Roel van Ettinger
- 申请人: Roel van Ettinger
- 申请人地址: US CA San Jose
- 专利权人: Micrel, Incorporated
- 当前专利权人: Micrel, Incorporated
- 当前专利权人地址: US CA San Jose
- 主分类号: G05F1/00
- IPC分类号: G05F1/00
摘要:
A low-dropout voltage (LDO) regulator that creates a zero in the open loop gain using a relatively small-sized current control element to divert part of the supplied load current through a “zero” resistor before adding it to the output load. The main part of the output load is passed through a relatively large second current control element. A control signal generated by an error amplifier (e.g., an op-amp) is used to control the small current control element, but is passed through a boost zero compensating resistor before being applied to the large current control element. The voltage signal developed across the “zero” resistor mimics the magnitude and phase of a zero in the loop. This voltage signal is added to the loop gain by, for instance, using a bypass capacitor, and the resulting feedback signal is supplied to the error amplifier.
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