H - Electricity – 02 – H
Patent
H - Electricity
02
H
330/2, 350/93
H02H 7/20 (2006.01) H03F 1/52 (2006.01) H03G 3/20 (2006.01)
Patent
CA 1123065
RCA 73,331 ABSTRACT OF THE INVENTION A circuit is provided for protecting an amplifier from signal overload upon the application of strong signals at the input to the amplifier. A unidirectionally conducting semiconductor device and a capacitor are serially coupled between the input to the amplifier and ground. Means for maintaining a constant voltage is coupled to the junction of the semiconductor device and the capacitor. Upon the application of a strong signal at the input to the amplifier, the semiconductor device conducts current to the junction of the constant voltage means and the capacitor, causing the voltage across the capacitor to increase. The constant voltage means senses this voltage increase, and responds by opposing the voltage increase so as to maintain a substantially constant voltage across the capacitor. The constant voltage at the junction of the semiconductor device and the capacitor maintains the semi- conductor device in a low impedance state, thereby attenuating the strong signal at the input to the amplifier. The circuit may also be operated in a second mode, in which current conduction by the semiconductor device and constant voltage means is under the control of the AGC system to attentuate the input signal to an I.F. amplifier.
337137
Morneau Roland L.
Rca Corporation
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