Patent ID: 9083843
Filing Date: 2015-07-14
Classification: H03F,H04N

Abstract:
1. A distributor amplifier having a noise blocking circuit, comprising: a first connector, used for inputting an RF signal; a first filter, coupled to said first connector for performing a filtering operation on said RF signal; a transformer, having a primary side coil and a secondary side coil, wherein said primary side coil has a first terminal coupled to an output terminal of said first filter for coupling said RF signal to said secondary side coil; a voltage scaling unit, having a first terminal coupled to a first terminal of said secondary side coil of said transformer for setting a voltage level of said RF signal; a first amplifier, having a first terminal coupled to a second terminal of said voltage scaling unit for amplifying the voltage of said RF signal; a detector, having a first terminal coupled to an output terminal of said first amplifier for detecting said RF signal; a second amplifier, coupled to an output terminal of said detector for further amplifying the voltage of said RF signal; a comparator, having a first input terminal and a second input terminal, said first input terminal being coupled with a reference voltage, said second input terminal being coupled to an output terminal of said second amplifier, and said comparator being used for providing a control signal; a switch circuit, having a first terminal coupled to a second terminal of said primary side coil of said transformer, and a second terminal coupled with said control signal from said comparator, wherein said switch circuit is switched on or off by said control signal to determine a passage of said RF signal; and a second connector, coupled to a third terminal of said switch circuit for outputting said RF signal.