HIGH FREQUENCY SIGNAL SELECTION CIRCUIT, INTEGRATED CIRCUIT FOR SIGNAL SELECTION, AND LOW NOISE DOWN-CONVERTER

摘要

PROBLEM TO BE SOLVED: To provide a high frequency signal selection circuit, an integrated circuit for signal selection and a low noise down-converter where a mounted printed circuit board is made small by reducing number of components, at low cost, with stable performance and high reliability. ;SOLUTION: Two switching circuits, that respectively select either of two different high frequency signals, are integrated in a signal selection integrated circuit 8. A comparator 9a which controls the two switching circuits of the signal selection integrated circuit 8 is integrated in a switching control integrated circuit 9. Signal lines are connected to a signal input terminal of each switch circuit of the signal selection integrated circuit 8, so as not to cross and a power supply line is provided so as not to cross the signal the signal lines.;COPYRIGHT: (C)1999,JPO