The rf9958 produced by RF Micro Device integrates a complete orthogonal demodulator, an intermediate frequency automatic gain control amplifier and an up-converter, and can be used as a transmitting unit in a dual-mode CDMA/FM cellular mobile communication system and a PCS system. The chip can provide a 95dB gain control range when modulating the baseband IQ channel signal. This article introduces the principle, characteristics and typical application circuit of RF9958.
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