DESIGN OF GIGAHERTZ TUNING RANGE 5GHz LC DIGITALLY CONTROLLED OSCILLATOR IN 0.18 μm CMOS
نویسندگان
چکیده
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 fine frequency tuning. Coarse and fine tuning switched capacitor arrays are controlled using 6-bit and 3-bit binary words. To increase available frequency values, frequency divider is used. Structure of frequency divider is based on extended-true-single-phase-clock flip-flops. Divider is made of eight divide-by-2 cells connected in daisy chain, thus division values from 2 to 256 are available. Wide tuning range and high division values allows using such DCO with frequency divider in multi-standart transceivers. Whole device is supplied from a single 1.8 V voltage source. At highest frequency proposed device draws 90 mA current including all buffers. Phase noise is −116.4 dBc/Hz at 1 MHz offset from 5.44 GHz carrier. Designed dual DCO and frequency divider occupies about 0.4mm× 0.5mm of chip space and whole chip, including pads, occupies 1.5mm× 1.5mm area of silicon.
منابع مشابه
Design and Simulation of an X Band LC VCO
In this paper, a systematic method for the circuit parameters design of a monolithic LC Voltage Controlled Oscillator (VCO) is reported. The method is based on the negative resistance generation technique. As a result, a VCO has been designed in 0.18um CMOS technology using a conventional VCO structure to obtain the optimum values for the phase noise and power consumption. The simulation result...
متن کاملWide Tuning Range LC-VCO Using Variable Inductor for Reconfigurable RF Circuit
This paper presents a novel wide tuning range CMOS Voltage Controlled Oscillator (VCO). VCO uses an on-chip variable inductor as an additional variable element to extend the tuning range of VCO. The fabricated variable inductor achieves the variable range of 35%. The VCO was fabricated using 0.35 μm standard CMOS process, and can be tuned continuously from 2.13 GHz to 3.28 GHz (tuning range of ...
متن کاملA Low-Phase-Noise 5GHz Quadrature CMOS VCO using Common-Mode Inductive Coupling
A new concept for quadrature coupling of LC oscillators is introduced and demonstrated on a 5GHz CMOS VCO. It uses injection-locking through commonmode inductive coupling to enforce quadrature. The technique provides quadrature over a wide tuning range without introducing any phase noiseor power consumption increase. The realized VCO is tunable between 4.6GHz and 5.2GHz and measures a phase noi...
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, Low Power and Wide Tuning Range VCO with Filtering Technique in ISM Band
In this paper, a novel voltage controlled oscillator (VCO) with low phase noise, low power consumption and wide tuning range in the industrial, scientific and medical (ISM) band is proposed for communication systems applications. For improving the phase noise, filtering technique is used and VCO is designed with TSMC CMOS 0.18 μm technology and the power supply is 1.5 V. The simulation results ...
متن کامل