Amplifiers – Signal feedback – Phase shift means in loop path
Patent
1974-11-18
1976-05-04
Mullins, James B.
Amplifiers
Signal feedback
Phase shift means in loop path
330 51, 330103, 330110, H03F 136
Patent
active
039551512
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.
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.
Mullins James B.
Sony Corporation
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