The present invention relates to a method for controlling the operation of a low noise amplifier. In particular, when storing a broadcast channel, the AGC voltage is stored together and the broadcast channel is determined from previously stored information to determine whether the tuned broadcast channel is a weak field or a strong field when watching a broadcast program. The purpose is to automatically control the operation of the low noise amplifier at each switching. The present invention for this purpose is a low noise amplifier 210 to reduce the noise of the signal received by the antenna, and the desired channel signal of the signal received by the antenna is tuned to the intermediate frequency signal processor 240 through the SAW filter 240 The tuner 230 is switched to the contact point S1 in the case of a weak electric field, and the output signal of the low noise amplifier 110 is input to the tuner 230, and the switch signal is switched to the contact point S2 in the case of a strong electric field, and the signal of the antenna is transmitted. The control switch 220 to be input to the tuner 120, the AGC detection unit 260 for detecting the AGC voltage by checking the output signal of the intermediate frequency signal processing unit 250, and in the automatic tuning mode for each channel The AGC detection unit 260 determines the on / off of the low voltage amplifier flag from the AGC voltage and stores the low voltage amplifier flag. The low voltage amplifier is read by reading the low voltage amplifier flag of the current channel stored in the internal memory. After controlling the control switch 220 by determining whether or not the operation of the device 210 is configured as a microcomputer 270 that determines whether to update the low voltage amplifier flag from the AGC voltage detected by the AGC detector 260. .
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