عنوان مقاله :
Reference spur suppression in the Integer-N frequency synthesizers by reducing periodic ripples amplitude on the VCO control voltage
پديد آورندگان :
S ،Jahangirzadeh Department of Electrical Engineering - South Tehran Branch - Islamic Azad University - Tehran, Iran , A ،Amirabadi Department of Electrical Engineering - South Tehran Branch - Islamic Azad University - Tehran, Iran , A ،Farrokhi Department of Electrical Engineering - South Tehran Branch - Islamic Azad University - Tehran, Iran
كليدواژه :
Spur suppression , reference spur , voltage controlled oscillator (VCO) , and integer-N frequency synthesizer
چكيده لاتين :
To achieve a low reference spur for an Integer-N 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 180-nm CMOS technology was used for post-layout 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.
عنوان نشريه :
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