Multiple Feedback Paths Patents (Class 330/103)
Positive and negative feedback (Class 330/104)
  • Active-R filter
    Patent number: 3955150
    Abstract: An operational amplifier-type active filter in which the only capacitor in the circuit is the compensating capacitance of the operational amplifiers, the various feedback and coupling elements being essentially solely resistive.
    Type: Grant
    Filed: January 15, 1975
    Date of Patent: May 4, 1976
    Assignee: The United States of America as represented by the United States Energy Research & Development Administration
    Inventor: Michael A. Soderstrand