Design of LC Oscillator and VCO for ISM and WI-FI Band Applications (original) (raw)

An Efficient Design of CMOS based Differential LC and VCO for ISM and WI-FI Band of Applications

Oscillators are integral part of many electronic systems. Its applications are from microprocessor clock generation to the nest bee phone carrier synthesis. CMOS circuitry in VLSI dissipates less power during static, and is denser than any other implementations having the similar functionality. In this paper, we propose the architecture of a CMOS based differential LC oscillator using actual capacitor and Inductor component. We are designing this architecture for WI-FI and ISM band of frequency applications. The circuit is easy to be integrated and with low power consumption. The presented results are obtained using CMOS EDA tool Microwind 3.5 with CMOS technology 45nm. The calculated results are obtained with the working formulas and can be compared with the current scenario.

Design of wide-band cmos vco for multiband wireless lan applications

IEEE Journal of Solid-State Circuits, 2003

In this paper, a general design methodology of low-voltage wide-band voltage-controlled oscillator (VCO) suitable for wireless LAN (WLAN) application is described. The applications of high-quality passives for the resonator are introduced: 1) a single-loop horseshoe inductor with 20 between 2 and 5 GHz [1] for good phase noise performance; and 2) accumulation MOS (AMOS) varactors with max min ratio of 6 [2] to provide wide-band tuning capability at low-voltage supply. The adverse effect of AMOS varactors due to high sensitivity is examined. Amendment using bandswitching topology is suggested, and a phase noise improvement of 7 dB is measured to prove the concept. The measured VCO operates on a 1-V supply with a wide tuning range of 58.7% between 3.0 and 5.6 GHz when tuned between 0.7 V. The phase noise is 120 dBc/Hz at 3.0 GHz, and 114.5 dBc/Hz at 5.6 GHz, with the nominal power dissipation between 2 and 3 mW across the whole tuning range. The best phase noise at 1-MHz offset is 124 dBc/Hz at the frequency of 3 GHz, a supply voltage of 1.4 V, and power dissipation of 8.4 mW. When the supply is reduced to 0.83 V, the VCO dissipates less than 1 mW at 5.6 GHz. Using this design methodology, the feasibility of generating two local oscillator frequencies (2.4-GHz ISM and 5-GHz U-NII) for WLAN tranceiver using a single VCO with only one monolithic inductor is demonstrated. The VCO is fabricated in a 0.13-m partially depleted silicon-on-insulator CMOS process.

A 2.4 GHZ FULLY INTEGRATED LC VCO DESIGN USING 130 NM CMOS TECHNOLOGY

In this paper, a 2.4 GHz fully integrated LC voltage controlled oscillator (VCO) for RF wireless applications is presented. The VCO circuit is designed using TSMC 130 nm CMOS process. The circuit design is based on differential oscillator structure with cross-coupled NMOS transistors which achieves low power dissipation and low phase noise. Simulation and layout of the VCO is carried out using ADS Tool. The VCO operates from a supply voltage of 1.8 V and consumes 19.62 mW of power. After simulating the proposed design the VCO shows a phase noise of-128.68 dBc/Hz at 1 MHz offset frequency from a 2.4 GHz carrier signal. The frequency range of the VCO is from 2.36 GHz to 2.61 GHz when the control voltage changes from 0 to 2 V. The FOM is obtained as-183.73 dBc/Hz. The total chip area, including pads, occupies 0.7 mm × 0.7 mm.

Design of a 2.2-4.0 GHz Low Phase Noise and Low Power LC VCO

This paper reports a design of an integrated Voltage Controlled Oscillator (LC-VCO) with high oscillation frequency, Low power consumption and Low Phase noise. For obtaining the performance parameters, the design was simulated in 0.18µm CMOS technology. Results of the present deign shows that the oscillation frequency of VCO is 2.2GHz to 4.0 GHz; the power consumption of the VCO at oscillation frequency of 2.2GHz is 16.13 mw and phase noise-143 mdb/HZ. In addition at 3.3 GHz and 4.0 GHz is 15.76 mW and 15.31mW with phase noise -151 mdb/Hz and -207mdb/Hz respectively. We have compared the results of the present design with earlier published work and is presented in table 1.

Power Efficient Implementation of Low Noise CMOS LC VCO using 32nm Technology for RF Applications

International Journal of Emerging Research in Management and Technology

Voltage Controlled Oscillator (VCO) is an integral component of most of the receivers such as GSM, GPS etc. As name indicates, oscillation is controlled by varying the voltage at the capacitor of LC tank. By varying the voltage, VCO can generate variable frequency of oscillation. Different VCO Parameters are contrasted on the basis of phase noise, tuning range, power consumption and FOM. Out of these phase noise is dependent on quality factor, power consumption, oscillation frequency and current. So, design of LC VCO at low power, low phase noise can be obtained with low bias current at low voltage. Nanosize transistors are also contributes towards low phase noise. This paper demonstrates the design of low phase noise LC VCO with 4.89 GHz tuning range from 7.33-11.22 GHz with center frequency at 7 GHz. The design uses 32nm technology with tuning voltage of 0-1.2 V. A very effective Phase noise of -114 dBc / Hz is obtained with FOM of -181 dBc/Hz. The proposed work has been compared...

Recent Trends in LC Voltage Controlled Oscillator to Achieve Low Phase Noise: A Literature Survey

The Voltage Controlled Oscillator is the most essential part of the transceivers that deals with generating a system frequency in the RF range for most of the wireless Devices. LC voltage Controlled Oscillator plays essential role in the many applications of RF frequency band-ISM frequency band (Industrial, Scientific, Medical) like Zigbee, Bluetooth, front-end RF transceiver,-IEEE 802.11a/b/g,-IEEE 802.15.4, etc. The performance and accuracy of these application designs depends upon the features and development methods of the Oscillator. As requirement to fulfil accuracy and power constrains, new techniques have been presented to improve the features like phase noise, FOM, tail current and low power. In this era, we have different methods to improve features of VCO to get the better results. Still research is going on to achieve more accurate results. So, questions may arise in researches' mind about selection of the technique to improve the performance for required application. The selection of the proper technique involves improvement of particular feature and which improves overall performance of the system. This is the main motive to write a comprehensive survey of Voltage controlled Oscillator from forgoing to contemporary. In this paper, Details of all the techniques to improve Phase noise in the RF-ISM frequency band with merits-demerits including low power and FOM is presented. In this paper comparative analysis is also given to find the features in this field. The paper is concluded with the survey, which serves as reference for the researchers in the field of RF-ISM Frequency band LC Voltage controlled oscillator.

A low voltage low power CMOS based 4GHz VCO for RF applications

This paper presents a novel circuit design of a CMOS LC voltage controlled oscillators. Being a crucial part in RF front-ends, the voltage-controlled oscillator (VCO) is considered as one of the most powerconsuming components. The proposed VCO is suitable for low voltage and low power application. By replacing the tail current source by an inductor, VCO operates at reduced supply voltage. Adding one more pair of switching transistor, achieves low power dissipation and maintains the circuit performance in terms of voltage swing and tuning range. The simulation results of the proposed topology are compared with the reference circuit, to establish the usefulness of the circuit. Both proposed and references VCOs are simulated and realized in a 0.18 µm CMOS process technology. The proposed VCO is consuming a dc power of 7.02 mW at 0.5V supply voltage and 12.1 mW at a 0.6V supply voltage. VCO exhibits a frequency tuning range of 2.8%. The dc power consumption for reference VCO is 12.3 mW at 0.5V supply voltage and 35.37mW at a 0.6V supply voltage.