Mobile communication apparatus operable in different formats and pairing I-F band pass filter type with I-F amplifier characteristics

摘要

A radio communication apparatus is designed for a plurality of different radio communication formats, one of which can be selected. The radio communication apparatus includes a fixed-gain IF amplifier and a variable-gain IF amplifier. One is selected out of the fixed-gain IF amplifier and the variable-gain IF amplifier as an effectively used IF amplifier in response to which of the radio communication formats is selected. The fixed-gain IF amplifier is selected as an effectively used IF amplifier when a narrow-band radio communication format is selected. The variable-gain IF amplifier is selected as an effectively used IF amplifier when a wide-band radio communication format is selected.