A 430MHz-2.15GHz fractional-N frequency synthesizer for DVB and ABS-S applications

A 430 MHz-2.15 GHz wideband fractional-N frequency synthesizer RFIC for digital video broadcasting (DVB) and advanced broadcasting system-satellite (ABS-S) application is presented. A voltage controlled oscillator (VCO) with single inductor is coarsely tuned by banks of switch-capacitors and finely tuned by varactors to achieve both large frequency tuning range and limited VCO gain. A fast settling low dropout regulator (LDO) is employed to suppress the digital noise on supply line induced by the SigmaDelta modulator. A divid-by-3 VCO divider is designed based on a 3rd-order polyphase filter to generate the quadrature local oscillator (LO) carriers. This PLL is fabricated in a 0.35 mum SiGe BiCMOS technology. Measured result shows that the in-band phase noise is less than -96 dBc/Hz and the integrated RMS phase error is less than 1deg.