Patents Examined by Aditta Krishnan
  • Patent number: 5672959
    Abstract: A low drop-out regulator circuit that has high ripple rejection and low power consumption. A first local feedback loop is a high-speed, high-bandwidth loop that actively rejects noise from the input source to the regulator. A second feedback loop, having lower speed and a correspondingly lower bandwidth than the first feedback loop, regulates the output voltage. Each feedback loop is separately optimized for its respective bandwidth requirements and, therefore, the regulator is highly efficient. The first feedback loop comprises an amplifier and a pair of PMOS transistors configured as a current mirror with current gain. The first feedback loop generates a first current for charging an output capacitor. Feedback ensures that the first current is proportional to a second current generated by the second feedback loop while rejecting noise from the input source.
    Type: Grant
    Filed: April 12, 1996
    Date of Patent: September 30, 1997
    Assignee: Micro Linear Corporation
    Inventor: Lawrence Der