reference spur suppression in the integer-n frequency synthesizers by reducing periodic ripples amplitude on the vco control voltage

To achieve a low reference spur for an integern frequency synthesizer, a new spur reducing technique was proposed. to reduce the size of periodic ripples on the vco control voltage, the low pass filter, and the charge pump were added with a spur reduction system.  by lowering the amplitude of the periodic ripple on the vco control voltage, we managed to lower the reference spur. the introduced technique removes the necessity to decrease bandwidth and cvo gain reference spur suppressing. to demonstrate the effectiveness of the proposed structure, a 2.06 – 2.22 ghz frequency synthesizer was used and the 180nm cmos technology was used for postlayout simulation. the proposed frequency synthesizer represents the reference spur of 85.84 dbc at 20 mhz offset and phase noise of 108dbc/hz at 200 khz offset frequency also it is locked after 2.8us while occupied 0.35 mm^2 of the chip area.

Reference spur suppression in the Integer-N frequency synthesizers by reducing periodic ripples amplitude on the VCO control voltage

To achieve a low reference spur for an IntegerN frequency synthesizer, a new spur reducing technique was proposed. To reduce the size of periodic ripples on the VCO control voltage, the low pass filter, and the charge pump were added with a spur reduction system.  By lowering the amplitude of the periodic ripple on the VCO control voltage, we managed to lower the reference spur. The introduced technique removes the necessity to decrease bandwidth and CVO gain reference spur suppressing. To demonstrate the effectiveness of the proposed structure, a 2.06 – 2.22 GHz frequency synthesizer was used and the 180nm CMOS technology was used for postlayout simulation. The proposed frequency synthesizer represents the reference spur of 85.84 dBc at 20 MHz offset and phase noise of 108dBc/Hz at 200 kHz offset frequency also it is locked after 2.8us while occupied 0.35 mm2 of the chip area.