Television tuner for both analog and digital signal
First Claim
1. A television tuner, comprising:
- an intermediate frequency amplifier to which a first intermediate frequency signal based on an analog television signal or a second intermediate frequency signal based on a digital television signal is input;
a first SAW filter to which the first intermediate frequency signal output from the intermediate frequency amplifier is input;
a second SAW filter to which the second intermediate frequency signal output from the intermediate frequency amplifier is input; and
a distributor inserted between the intermediate frequency amplifier and the first and second SAW filters, wherein an input port of the distributor is connected to ground by a reactance element, and a reactance value of the reactance element is switched so as to have a conjugation relationship with a reactance component of the respective input impedance of the first and second SAW filters.
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Accused Products
Abstract
The intermediate frequency signal based on the analog television signal and the intermediate frequency signal based on the digital television signal can be supplied to the intermediate frequency circuit without being distorted and with characteristics needed to the transfer of the analog television signal and the digital television signal. The television tuner contains a first SAW filter 29a to which a first intermediate frequency signal is input, a second SAW filter 30a to which a second intermediate frequency signal is input, a distributor 25 inserted between the intermediate frequency amplifier 22 and the first and second SAW filters 29a and 30a. The input port of the distributor 25 is connected to the ground by a reactance element 26, and the reactance value of the reactance element 25 is switched so as to have a conjugation relationship with the reactance component of the respective input impedance of the first and second SAW filters 29a and 30a.
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Citations
4 Claims
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1. A television tuner, comprising:
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an intermediate frequency amplifier to which a first intermediate frequency signal based on an analog television signal or a second intermediate frequency signal based on a digital television signal is input;
a first SAW filter to which the first intermediate frequency signal output from the intermediate frequency amplifier is input;
a second SAW filter to which the second intermediate frequency signal output from the intermediate frequency amplifier is input; and
a distributor inserted between the intermediate frequency amplifier and the first and second SAW filters, wherein an input port of the distributor is connected to ground by a reactance element, and a reactance value of the reactance element is switched so as to have a conjugation relationship with a reactance component of the respective input impedance of the first and second SAW filters. - View Dependent Claims (2, 3, 4)
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Specification