| 摘要 |
PROBLEM TO BE SOLVED: To provide a multimode correspondence high frequency integrated circuit for preventing a deterioration in a transmitting characteristic of a transmission wave by reducing the influence on the transmission wave of an operating mode even when a low noise amplifier is included in the multimode correspondence high frequency integrated circuit.SOLUTION: As a multimode correspondence high frequency integrated circuit RFIC for managing modulation and demodulation processing between a transmission and reception signal of a multimode and a baseband signal, a disconnecting switch RFSW for disconnecting a radio signal line between circuits is provided in each of reception circuits RX Block used by each mode, in a receiving circuit used by an inactive mode, the disconnecting switch RFSW is turned off to disconnect the radio signal line between the circuits in the reception circuit, and in a reception circuit used by an operating mode, the disconnecting switch RFSW is turned on to connect the radio signal line between respective circuits in the reception circuit. The disconnecting switch RFSW is arranged, for example, between the low noise amplifier LNA and a mixer Mixer. |
