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.

Schematic diagram of audio decibel meter

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