| 摘要 |
PROBLEM TO BE SOLVED: To reduce power consumption by making a receiving system after a level shifter operate at a low power source voltage. SOLUTION: The receiving system places the level shifter 60 between an image rejection mixer 15 and a channel selection filter 17. A power supply voltage of a circuit in the rear stage of the level shifter 60 is made lower than a power supply voltage of a circuit at the front stage of the level shifter 60. An RF filter 11, an RF amplifier 20, and the image rejection mixer 15 are located in the front stage of the output unit of the level shifter 60, a channel selection filter 71 composed of a switched capacitor filter, an IF amplifier 81, and an IF detector 91 are located in the rear stage of the output part of the level shifter 60. Since the front stage of the level filter 60 and the rear stage of it are separately formed into integrated circuits, different power supply voltages are given. COPYRIGHT: (C)2007,JPO&INPIT
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