Limiting amplifier with adjustable limits Patent #: 3999084
ApplicationNo. 777990 filed on 03/16/1977
US Classes:327/323, Feedback327/309, By limiting, clipping, or clamping327/334, SPECIFIC INPUT TO OUTPUT FUNCTION330/85, Amplifier in signal feedback path330/110Nonlinear impedance element in loop path
ExaminersPrimary: Zazworsky, John
Attorney, Agent or Firm
International ClassH03K 005/08
AbstractThe invention covers an amplifier circuit in which the output is limited in either polarity. Normally, a part of the output voltage is fed back to the input to maintain linearity but when the output reaches a maximum or minimum value, any further departure is amplified and fed back to the input circuit to neutralize the part of input signals which is outside of the range to be amplified. The feedback amplifier can be designed to initiate limiting at any desired output voltages and the positive and negative output limit voltages can be asymmetric with respect to the quiescent output voltage.