Abstract: Provided is a digital broadcasting receiver that converts received signals including broadcasting signals of all channels directly to digital ones and then processes them, without change of intermediate frequency thereof. The inventive broadcasting receiver comprises an antenna for receiving signals of entire broadcasting bands on which broadcasting channels exist, a digital conversion module that includes a Variable Gain Amplifier (VGA) module for sampling the received signals from the antenna at sampling frequencies with no aliasing and amplifying the signals, an analog to digital conversion module for sampling the output signals from the VGA module to convert them to digital received digitals and a power detector module for detecting powers of the digital received signals to apply them to a gain value of the VGA module, and a digital processing module for extracting only a signal of desired channel from the output signals of the digital conversion module.

Abstract: Disclosed is a control device for controlling power level between frequency assignment in an RF receiving device of a mobile radio communication base station system in a CDMA system capable of lowering the power level of the frequency assignment signal having a relatively high power difference, after the detection of the power level by the frequency assignment, to thereby minimize the power level difference between the frequency assignment and then, executing an AGC for three frequency assignment, whereby the performance deterioration of the whole channels, which is caused due to the disappearance of the frequency assignment signal having a relatively low power difference by the frequency assignment having the high power difference, can be prevented.