Invention Grant
US07656139B2 Creating additional phase margin in the open loop gain of a negative feedback amplifier system using a boost zero compensating resistor 有权
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额外的相位裕度

  • Patent Title: Creating additional phase margin in the open loop gain of a negative feedback amplifier system using a boost zero compensating resistor
  • Patent Title (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额外的相位裕度
  • Application No.: US11764758
    Application Date: 2007-06-18
  • Publication No.: US07656139B2
    Publication Date: 2010-02-02
  • Inventor: Roel van Ettinger
  • Applicant: Roel van Ettinger
  • Applicant Address: US CA San Jose
  • Assignee: Micrel, Incorporated
  • Current Assignee: Micrel, Incorporated
  • Current Assignee Address: US CA San Jose
  • Agency: Bever, Hoffman & Harms, LLP
  • Agent Patrick T. Bever
  • Main IPC: G05F1/40
  • IPC: G05F1/40
Creating additional phase margin in the open loop gain of a negative feedback amplifier system using a boost zero compensating resistor
Abstract:
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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