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Abstract

A card-type signal power detection device which has a low-noise amplification function therein and is capable of receiving a low-power signal and detecting the power of the received signal, and a frequency analysis apparatus which is capable of analyzing the frequency of the received signal under the condition that the card-type signal power detection device is mounted to a portable terminal device. The signal power detection device includes a radio frequency amplification circuit for attenuating and low-noise amplifying input signals, an intermediate frequency amplification circuit for converting an output signal from the radio frequency amplification circuit into a desired intermediate frequency signal and detecting power of the converted intermediate frequency signal, a local signal generator for supplying to the intermediate frequency amplification circuit a frequency signal corresponding to the intermediate frequency signal, and a digital signal processor for digitizing the signal power detected by the intermediate frequency amplification circuit such that it is appropriate to an interface standard, outputting the digitized result to the portable terminal device via an interface and supplying a desired reference frequency to the local signal generator. The detection device is of a thin card type.

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First Claim