| 摘要 |
PROBLEM TO BE SOLVED: To provide a T-DMB/DAB Low-IF receiver which can be implemented easily as a one chip while reducing the fabrication cost. SOLUTION: The Low-IF receiver comprises a low noise amplifying section for amplifying a received RF signal, a video image erasure down converting/mixing section for converting the frequency band of an output signal from the low noise amplifying section into the Low-IF band, a low-pass filtering section for filtering the low frequency band of an output signal from the video image erasure down converting/mixing section, a section for amplifying an output signal from the low-pass filtering section, a local oscillator for generating a down conversion frequency, a phase lock loop for locking the frequency of the local oscillator, and at least one high-pass filtering section arranged on a signal path including the video image erasure down converting/mixing section, the low-pass filtering section, and the amplifying section wherein the low noise amplifying section, the video image erasure down converting/mixing section, the low-pass filtering section, the amplifying section, the automatic gain control section, the local oscillator, the phase lock loop, and the high-pass filtering section are integrated on a single semiconductor circuit board thus obtaining a one chip Low-IF receiver. COPYRIGHT: (C)2007,JPO&INPIT
|
