Patent ID: 8208076
Filing Date: 2012-06-26
Classification: H03G,H03J,H04N

Abstract:
1. A front end circuit, comprising: a plurality of series circuits having tuning circuits and high frequency amplifiers individually corresponding to a plurality of reception bands into which television broadcasts are divided; a first switch circuit for selectively supplying a reception signal to the plural series circuits; a second switch circuit for selectively extracting an output of the plural series circuits in an interlocking relationship with said first switch circuit; first and second mixer circuits to which the reception signal output from said second switch circuit is supplied a PLL for supplying first and second local oscillation signals having phases orthogonal to each other to said first and second mixer circuits; a complex band-pass filter to which outputs of said first and second mixer circuits are supplied; and an output circuit for mathematically operating an output of said complex band-pass filter and outputting an intermediate frequency signal, wherein,