A CMOS voltage controlled oscillator topology for suppression of flicker noise up-conversion

A lOGHz CMOS Distributed Voltage Controlled Oscillator'

VDD A 10 GHz CMOS distributed voltage controlled oscillator (DVCO) is designed in a 0.35pm BiCMOS process technology using only CMOS transistors. The oscillator achieves a tuning range of 12% (9.3 GHz to 10.5 GHz) and a phase noise of -1 14 dBc/Hz at 1 MHz offset from a carrier frequency of 10.2 GHz. The VCO uses two different simultaneous tuning techniques which allow for a coarse and fine I t...

Voltage-controlled Oscillator-based A/D Conversion

There has recently been increasing interest in developing highly digital analog-to-digital converter (ADC) structures for on-chip testing and ease of integration in future CMOS processes. An intriguing circuit to utilize in such cases is a ring oscillator voltage-controlled oscillator (VCO), which outputs a clock waveform whose frequency is a function of an input tuning voltage. By comparing th...

طراحی و بهبود مشخصه های ساختاری voltage controlled ring oscillator در تکنولوژی cmos

از خصوصیات بارز vco حلقوی می توان به محدوده تنظیم گسترده، طراحی ساده، سطح سیلیکونی کوچک، مجتمع سازی آسان و تلفات توان پایین اشاره کرد. با این حال،نسبت به اسیلاتورهای lc به دلیل ضریب کیفیت پایین، عملکرد نویز فاز اسیلاتورهای حلقوی به طور کلی بسیار ضعیف است، که این یکی از چالش های مهم در طراحی vco حلقوی می باشد. در فصول ابتدایی این پایان نامه سعی بر بررسی ساختارهای مهم و کاربردی vcoهای حلقوی در کن...

Low Phase Noise Voltage - Controlled Oscillator

CMOS Voltage-Controlled Oscillator Resilient Design for Wireless Communication Applications

Semiconductor process variation and reliability aging effect on CMOS VCO performance has been studied. A technique to mitigate the effect of process variations on the performances of nano-scale CMOS LC-VCO is presented. The LC-VCO compensation uses a process invariant current source. VCO parameters such as phase noise and core power before and after compensation over a wide range of variability...