Patent ID: 6501513
Filing Date: 2002-12-31
Classification: H03D

Abstract:
A television signal receiving tuner comprising:an integrating circuit including at least a mixer which frequency converts a received television signal to an intermediate frequency signal and an intermediate frequency circuit; an intermediate frequency amplifying circuit which is separate from the integrated circuit and has an amplification degree; and an SAW filter which is separate from the integrated circuit and attenuates adjacent bands out of the intermediate frequency band of the television signal by a predetermined attenuation amount, wherein the integrated circuit has at least a first terminal and a second terminal and outputs the intermediate frequency signal obtained by the frequency conversion by the mixer from the first terminal, and the intermediate frequency signal is serially passed through the intermediate frequency amplifying circuit and the SAW filter and supplied from the second terminal to the intermediate frequency circuit, wherein the amplification degree of the intermediate frequency amplifying circuit is set to be equal to or higher than a value which is obtained by adding insertion loss of the SAW filter to the absolute value of a difference between the isolation between the first terminal and the second terminal and the attenuation amount of the SAW filter.