| 摘要 |
PURPOSE: A digital TV receiver system is provided to minimize the phase distortion and impedance matching loss of an IF(Intermediate Frequency) signal converted in a tuner by performing impedance matching through PCB(Printed Circuit Board) designing, and to obtain the excellent performance by preventing noise introduced to a baseband signal. CONSTITUTION: A filter unit in a digital TV receiver consists of a first SAW(Surface Acoustic Wave) filter(21b) performing the SAW filtering of IF signals converted in a tuner(10), a driving unit(22b) driving the IF signals with necessary gain, a second SAW filter(23b) performing SAW filtering of the IF signals once again, and a matching unit(24b) preventing the inclination and ripple of the IF signals. The IF signals of the filter unit are converted into analog baseband signals in a mixer unit(30). The analog baseband signals are excellent signals improved up to 40dBm from 30dBm. The mixer unit additionally includes an LPF(Low Pass Filter) for preventing low pass noise. Therefore, the performance of a digital TV receiver is improved. |
