Patent ID: 9614487
Date: 2017-04-04
CPC Classifications: H03G

Claim:
1. A receiving apparatus, comprising: a rectifier to rectify a received signal to obtain a direct-current signal; a variable gain unit capable of changing a gain between a maximum gain and a minimum gain, and to amplify a received signal with the gain to obtain an amplified signal; a comparator to compare a power of the amplified signal with a reference value and to generate a comparison result; and a controller to set the gain to the maximum gain as a standby state in which the gain is fixed to the maximum gain, the controller to set the gain to a first gain between the maximum gain and the minimum gain as an AGC (automatic gain control) state in which the gain is variable if the signal having the power larger than the reference value is received in the standby state, the controller to set the gain to the maximum gain as a non-AGC state in which the gain is fixed to the maximum gain if the power is equal to or lower than the reference value and the gain is set to the first gain in the AGC state; the controller to turn to the standby state from the non-AGC state if the power is equal to or lower than the reference value and the gain is set to the maximum gain in the non-AGC state; and the controller to set the gain to a second gain between the maximum gain and the first gain in the AGC state and the second gain enabling reception of the received signal, if the power is larger than the reference value and the gain is set to the maximum gain in the AGC state.