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Detector, is a device fluctuation signals detected some useful information. For identifying wave oscillation or a signal or change in the presence of the device. Detector are typically used to extract the information carried. Detector into an envelope detector and a synchronous detector. The former output signal and the input signal envelope to the corresponding relationship between the main criteria used to demodulate AM signals. The latter fact is an analog multiplying device, to obtain a demodulated action requires additional fully consistent with the input signal is added to a carrier oscillation signal (coherent signals). Synchronous detector for demodulating the main signal or the residual sideband amplitude modulation sideband AM demodulated signal.
Perhaps the frequency of the RF signal detector parameters when selecting the first consideration. Wave's speed must be fast enough to extract the signal amplitude. It must also be able to provide a constant response over a substantial frequency range. For example, for measuring the transmission power of the mobile phone GSM detector must have the same sensitivity in the range of 880MHz to 915MHz.
Perhaps the frequency of the RF signal detector parameters when selecting the first consideration. Wave's speed must be fast enough to extract the signal amplitude. It must also be able to provide a constant response over a substantial frequency range. For example, for measuring the transmission power of the mobile phone GSM detector must have the same sensitivity in the range of 880MHz to 915MHz.
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