| 摘要 |
There is described a receiver (1) of at least one radiofrequency modulated signal deriving from an antenna (101) external to the receiver; the receiver comprises a first stage (103) for the low noise amplification of the radiofrequency modulated signal and a demodulation stage (106) of the above-mentioned signal. The receiver comprises a SAW filter (104) adapted to act as a pass band filter about a predetermined frequency for the signal deriving from the first stage, a logarithmic amplifier (105) adapted to amplify the signal deriving from the SAW filter, a peak detector (402) of the output signal of the logarithmic amplifier, means (203) adapted to control the gain of the first stage (103) for the amplification of the radiofrequency modulated signal as a function of the output signal (Vopeak) of the peak detector. |
