Design of Low Noise 16-bit CMOS Digitally Controlled Oscillator
نویسندگان
چکیده
In this paper, a new differential delay cell is proposed and 16-bit Digital Controlled Oscillator (DCO) based on proposed delay cell is designed. The 16-bit DCO consist of 4-stages differential delay cell in ring structure and a digital control scheme has been used to improved noise characteristics. The structure of the DCO utilizes dual delay path techniques to achieve high oscillation frequency and a wide tuning range. The DCO circuit has been simulated in SPICE with 0.5μm technology operating with supply voltage of 5V. DCO achieved a controllable frequency range of [1.7324-4.8649] GHz with a tuning range of 3.1325GHz (≈64%). The measured output noise is -161.2dB/Hz and the total harmonic distortion have been found 75.4865dB with 6666H control word. The phase noise in proposed DCO design is 179.4dB/Hz at a frequency of 1.7324GHz. KeywordCMOS, digital controlled oscillator, dual delay path technique, PLL, voltage controlled oscillator.
منابع مشابه
Optimization of Digitally Controlled Oscillator with Low Power
Abstract: In this paper, CMOS digitally controlled oscillator (DCO) design is analyzed for 4-16 bits. The CMOS DCO is designed based on a ring oscillator. Simulations of the analyzed DCO using 250nm CMOS technology achieve controllable different frequency range with a wide linearity. A 4-bit digitally controlled CMOS oscillator (DCO) design is best by adjusting the width of p-MOS and n-MOS devi...
متن کاملA Low-Power Digitally Controlled Oscillator for All Digital Phase-Locked Loops
A low-power and low-jitter 12-bit CMOS digitally controlled oscillator (DCO) design is presented. The Low-Power CMOS DCO is designed based on the ring oscillator implemented with Schmitt trigger inverters. The proposed DCO circuit uses control codes of thermometer type to reduce jitters. Performance of the DCO is verified through a novel All Digital Phase-Locked Loop (ADPLL) designed with a uni...
متن کاملDESIGN OF GIGAHERTZ TUNING RANGE 5GHz LC DIGITALLY CONTROLLED OSCILLATOR IN 0.18 μm CMOS
In this paper design and simulation of a 4.3 – 5.4 GHz LC digitally controlled oscillator (LC DCO) in IBM 7RF 0.18μm CMOS technology are presented. Wide gigahertz tuning range is achieved by using two LC DCOs, sharing same structure. DCO is made of one NMOS negative impedance transistor pair and LC tank, which consists of high quality inductor and two switched capacitor arrays for coarse and fi...
متن کاملA Precise ΔΣ-based Digitally Controlled Oscillator (DCO) for All-Digital PLL
A Digitally Controlled Oscillator (DCO) for the frequency band of 1700-1900 MHz is presented. This architecture achieves a frequency resolution less than 1-kHz. The DCO is a part of an All-Digital Phase-Locked Loop (ADPLL) for GSM-1800 and GSM-900 applications implemented in a 0.18 μm CMOS process. In this architecture an 18-bit delta sigma digital to analog converter and a voltage controlled L...
متن کاملA low-phase-noise digitally controlled crystal oscillator for DVB TV tuners
This paper presents a 25-MHz fully-integrated digitally controlled crystal oscillator (DCXO) with automatic amplitude control (AAC). The DCXO is based on Colpitts topology for one-pin solution. The AAC circuit is introduced to optimize the phase noise performance. The automatic frequency control is realized by a 10-bit thermometer-code segmental tapered MOS capacitor array, ensuring a 35 ppm tu...
متن کامل