ONE CHIP DIGITAL AUDIO BROADCASTING TUNER FOR DUAL BAND WITH SINGLE PHASE LOCKED LOOP

摘要

The present invention is to implement a circuit for providing an oscillation frequency for a dual-band by using a single phase-locked loop ., simplifying the circuit of the digital audio broadcast tuner, thereby to provide a single-chip implementation of the dual-band digital audio broadcast tuner in a semiconductor integrated circuit has its object ; The present invention, band- Depending on the choice or L- band mode selection signal for selecting (SMS), according to the digital audio broadcasting of L- band or dual-band chip for selectively receiving - band digital audio broadcast tuner, a mixer section 140 ; PLL unit 210; A first switched VCO 220; The second switched-VCO 230; Buffer section 240; The path switching unit 250; And switched to the housewife minutes 260 characterized by a. ; According to the present invention, it is possible to significantly reduce the number of components and devices used, and thus to reduce the manufacturing cost relates to a single-chip dual-band tuner for digital audio broadcasting.