The audio decibel meter circuit uses it not only as a RF device designed for sa604, but also as a received signal strength indicator (RSSI). In cellular radio, the radio microcomputer uses this function to continuously monitor the strength of the received signal. This circuit is a logarithmic response proportional to the input signal level. The logarithmic response can be provided by sa604 with an operating frequency range of 80 dB to 15MHz.

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