Patent ID: 7218910
Filing Date: 2007-05-15
Classification: H04B

Abstract:
1. A low noise block downconverter, comprising: (a) a receiving circuit for selecting a target broadcast and receiving signals from a satellite of a broadcast thus selected in response to a control pulse for selecting a target satellite, which is transmitted from a receiver, and for amplifying signals thus received and outputting the signals to the receiver; (b) a regulator IC producing a source voltage for being supplied to said receiving circuit in accordance with a direct current for power source inputted to said regulator IC; (c) an LC parallel resonance circuit electrically separating said regulator IC from the control pulse; and (d) a diode, which is connected in parallel to said LC parallel resonance circuit, causing a loop current to flow back via said diode and an inductor in said LC parallel resonance circuit so that a counter electromotive force, due to a surge voltage, which occurs across the inductor is cancelled.