Patent ID: 8027647
Filing Date: 2011-09-27
Classification: H03G,H03H,H04H

Abstract:
1. A broadcasting receiving apparatus comprising: a low noise amplifying unit for low-noise-amplifying an RF signal received from an antenna; an RF attenuating unit for attenuating the received RF signal to output the attenuated RF signal; a supply unit for supplying a DC voltage to the low noise amplifying unit; and a control unit for controlling to output the DC voltage when the received RF signal has a weak electric field strength, wherein the low noise amplifying unit is capable of amplifying the received RFF signal when the DC voltage is supplied, and the low noise amplifying unit is turned off and the received RF signal is bypassed when supply of the DC voltage is stopped, wherein the supply unit comprises: a first coil connected to an RF output terminal of the RF attenuating unit and capable of passing an incoming DC voltage; a second coil connected to an RF input terminal of the RF attenuating unit and capable of passing the incoming DC voltage; a diode connected in series between the first coil and second coil for intercepting a current flowing in a reverse direction; a first bypass capacitor having one end grounded and the other end connected to a first side of the diode; and a second bypass capacitor having one end grounded and the other end connected to a second side of the diode.