| 摘要 |
PURPOSE:To provide a compact digital mobile telephone set with low power consumption by sharing the circuits, in a digital mobile telephone set which can share two different frequency bands (800MHz band and 1.5MHz band). CONSTITUTION:In the digital mobile telephone set which can share the 800MHz band and 1.5MHz band, the means by which an antenna 1, a receiving circuit (amplifier 7, a band pass filter 8, a mixer 9, band pass filter 10, an amplifier 11, mixer 16, and an I/F circuit 17), and a quadrature modulator 20 are shared in the two frequency bands and a frequency-divider, etc., are used to phase the oscillators, so that the number of the oscillators can be reduced. Thus, the equipment can be made small in size and low in power consumption 1. |
