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Primary Examiner: Mullins, James B.
Assistant Examiner:
Attorney: Hill, Gross, Simpson, Van Santen, Steadman, Chiara & Simpson

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Title: Amplifier with a plurality of negative feedback circuits

Abstract: An amplifier is disclosed which may selectively be connected to different input circuits and which is provided with a plurality of switchable negative feedback impedance networks. A feedback attenuation impedance is provided which prevents oscillation of the amplifier triggered by positive feedback through switch leakage resistance between switch contacts. The attenuation impedance lower the loop again in the circuit formed by the amplifier, leakage resistance and disconnected feedback impedance by lowering the loop gain below the oscillation point.

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Inventors: Ochiai, Yoshio (Yokosuka, JA)

Application Number: 524958
Filing Date: 1974-11-18
Publication_date: 1976-05-04
Assignee: Sony Corporation (Tokyo, JA)
Primary Class(es): 330/107 330/51, 330/103, 330/110
Other Classes:
US Patent Ref:
Other Refs: Other References: burrows, "Ceramic Pickups and Transistor Bre-Amplifiers", Wireless World, Feb. 1970, pp. 56-60, 80.
Rose, "Simplified Design of Feedback Equalizers", Radio & Television News, Sept. 1954, pp. 54-57, 156, 157.