Alternating current amplifier with digitally controlled frequency response
Patent 4868516 Issued on September 19, 1989. Estimated Expiration Date: 
April 14, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 14, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesPulse amplifying system Patent #: 4481466 InventorsAssigneeApplicationNo. 07/182564 filed on 04/14/1988US Classes:330/86, Variable impedance in feedback path varied by separate control path330/107, Phase shift means in loop path330/2WITH AMPLIFIER CONDITION INDICATING OR TESTING MEANSExaminersPrimary: Mullins, James B.Attorney, Agent or FirmInternational ClassesH03G 5/00 (20060101)H03G 5/02 (20060101) AbstractAn improved alternating current amplifier employs capacitive feedback to balance the intrinsic input capacitance, and a multiplier circuit responsive to a digital control signal coupled in the feedback path to vary the effective capacitance of the capacitive feedback. Thus, the frequency response of the amplifier may be adjusted and set digitally, such as under computer control, obviating the need to make manual adjustments to improve amplifier performance.Other References
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