| 摘要 |
PURPOSE: A circuit for cutting-off spurious wave of primary if dielectric filter in digital tuner is provided to remove a spurious wave element of a high-order mode by reducing the length of a dielectric filter and inserting an inductor and a capacitor into an input terminal and an output terminal of the dielectric filter. CONSTITUTION: A spurious wave shielding circuit of a first IF dielectric filter of a digital tuner includes a dielectric filter, a first compensation circuit, and a second compensation circuit. The dielectric filter(110) has the length of 5 to 6mm. The first compensation circuit(120) is installed at a front end of the dielectric filter. The first compensation circuit is formed with a plurality of inductors and a plurality of capacitors. The second compensation circuit(130) is installed at a latter part of the dielectric filter. The second compensation circuit is formed with a plurality of inductors and a plurality of capacitors. |
