A dual-band frequency synthesizer for CMMB application with low phase noise

A wide-band frequency synthesizer with low phase noise is presented.The frequency tuning range is from 474 to 858 MHz which is compatible with U-band CMMB application while the S-band frequency is also included. Three VCOs with selectable sub-band are integrated on chip to cover the target frequency range.This PLL is fabricated with 0.35μm SiGe BiCMOS technology.The measured result shows that the RMS phase error is less than 1°and the reference spur is less than -60 dBc.The proposed PLL consumes 20 mA current from a 2.8 V supply.The silicon area occupied without PADs is 1.17 mm;.

A wide-band frequency synthesizer with low phase noise is presented.The frequency tuning range is from 474 to 858 MHz which is compatible with U-band CMMB application while the S-band frequency is also included. Three VCOs with selectable sub-band are integrated on chip to cover the target frequency range.This PLL is fabricated with 0.35μm SiGe BiCMOS technology.The measured result shows that the RMS phase error is less than 1°and the reference spur is less than -60 dBc.The proposed PLL consumes 20 mA current from a 2.8 V supply.The silicon area occupied without PADs is 1.17 mm^2.