Low Phase Noise Wide Tuning Range LC Oscillator for RF Application Using Varactor Bank (original) (raw)

Analysis and design of a 1.8GHz CMOS LC quadrature VCO

IEEE Journal of Solid-state Circuits, 2002

This paper presents a quadrature voltage-controlled oscillator (QVCO) based on the coupling of two LC-tank VCOs. A simplified theoretical analysis for the oscillation frequency and phase noise displayed by the QVCO in the 1 3 region is developed, and good agreement is found between theory and simulation results. A prototype for the QVCO was implemented in a 0.35m CMOS process with three standard metal layers. The QVCO could be tuned between 1.64 and 1.97 GHz, and showed a phase noise of 140 dBc/Hz or less across the tuning range at a 3-MHz offset frequency from the carrier, for a current consumption of 25 mA from a 2-V power supply. The equivalent phase error between I and Q signals was at most 0.25 .

A 4.8GHz Low-Phase Noise Quadrature Colpitts VCO

2006 International Symposium on VLSI Design, Automation and Test, 2006

A 4.8GHz low-noise quadrature Colpitts VCO is second-order harmonic coupling to enforce the quadrature presented. Use of the current switching differential Colpitts relation between two oscillators. Using the cross-coupled pair configuration together with superharmonic coupling scheme LC VCO's, this technique has been used to generate for quadrature signal generation ensures low phase noise quadrature over a wide tuning range without suffering from an operation. The advantage of proposed differential VCO is increase in power consumption or phase noise. However, it analyzed in terms of power consumption, phase noise, and has not been applied to the noise-shifting differential Colpitts figure of merit. The QVCO has been fabricated with the VCO to generate quadrature output. 0.1 8um TSMC CMOS technology for 4.8GHz band operation In this paper we therefore combine the above two and the obtained phase noise is -120 dBc/Hz at 1MHz offset techniques, noise-shifting differential Colpitts oscillators and frequency while 7mA current consumption and 12.6mW superharmonic coupling, to create a new oscillator topology to power consumption from 1.8V power supply.

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.

Very low noise current- shaped optimally coupled CMOS LC quadrature VCO

IEICE Electronics Express, 2010

This paper presents a new low phase noise quadrature voltage-controlled oscillator (QVCO). Coupling phase shifts of 90 • in conjunction with center-tapped capacitor impedance transformers are exploited to optimally couple two VCOs. DC and AC path of the switching and coupling pairs are de-coupled to allow operation in saturation for large oscillation amplitudes. The switching and coupling transistor pairs operate in class-C mode which increases the DC to RF efficiency. Also, these transistors alternate from strong inversion to accumulation region, decreasing the intrinsic device flicker noise. Simulations confirm the superiority of the proposed circuit in comparison with the prior published QVCOs in terms of phase noise performance.

A Wide Tuning Range and Low Phase Noise VCO using New Capacitor Bank Structure

Majlesi Journal of Electrical Engineering, 2018

This paper presents a wide tuning range, and low noise voltage controlled oscillator (VCO) based on cross-coupled and colpitts structures. The advantages of this work provide a low-phase noise and robust start-up condition, leading to minimized the dc power. In addition, a new structure of capacitor bank is used in this structure to achieve a wide range of frequency. The proposed circuit is simulated in 0.18 µm CMOS process. The designed VCO covers the frequency range of 21.95 GHz to 24 GHz with a tuning range of 8.9%. Simulation results show that the phase noise is -120.5 dBc/Hz at 1MHz offset frequency for 23GHz carrier frequency. Also, power consume of the VCO is 6.34 mW under 1.8 supply voltage, and the figure-of-merit is -191.68 dBc/Hz.

A CMOS 3.3-8.4 GHz wide tuning range, low phase noise LC VCO

2009

A novel inductor switching technique is used to design and implement a wideband LC voltage controlled oscillator (VCO) in 0.13µm CMOS. The VCO has a tuning range of 87.2% between 3.3 and 8.4 GHz with phase noise ranging from −122 to −117.2 dBc/Hz at 1MHz offset. The power varies between 6.5 and 15.4 mW over the tuning range. This results in a Power-Frequency-Tuning Normalized figure of merit (PFTN) between 6.6 and 10.2 dB which is one of the best reported to date.

Conception of Low Phase Noise RF-VCO Using MOS Varactor

IJCSNS, 2007

In this paper we propose new oscillator architecture (VCO2) and we compare it with a simple oscillator (VCO1). We describe the design and implementation of the differential LC-VCO for wireless applications. In this work we develop an analytical framework for determining the best VCO for a high-frequency synthesizer design based on the constraints of the application. We show methods for reducing the phase noise in LC-VCO. We describe the optimization of phase noise performance. We examine the effect of the choice of MOS varactor on the performance of a CMOS negative resistance oscillator. The three most common MOS varactor structures (inversion, accumulation, and gated varactor) are well studied. The design of both VCOs was implemented in a standard 0.35μm CMOS process. The VCO 2 is utilized in this study because of its low phase noise. It exhibits a 1.9 GHz frequency at 2 V supply voltage. Phase-noise measurements show a phase-noise of about -90 dBc/Hz at 1MHz from the carrier.

A Low Power Low Phase Noise LC Voltage-Controlled Oscillator

Progress In Electromagnetics Research Letters, 2013

A low phase noise CMOS complementary cross-coupled LC-tank voltage-controlled oscillator (VCO), implemented with TSMC 0.18 µm 1P6M CMOS technology, is presented. Double pair pseudoresistance transistors biased by the tapped center of the inductor are utilized to reduce the DC bias current. The circuit consumes 1.55 mA from a 1.5 V supply voltage which saves up to 52.4% power, compared with the conventional one. Furthermore, an adaptive body biasing technique (ABB) is used to overcome the effect of PVT variations. The VCO is tunable from 2.58 to 3.07 GHz and has a phase noise −122.7 dBc/Hz at 1 MHz offset from the 3 GHz carrier. The Figure of Merit (FOM) of the proposed VCO is −188.8 dBc, and the figure of merit including the tuning range (FOM T ) is −193.5 dBc.

A new low-phase noise direct-coupled CMOS LC-QVCO

IEICE Electronics Express, 2009

A new LC quadrature voltage-controlled oscillator (LC-QVCO), made with direct coupling of two CMOS LC-VCOs, is presented. In the proposed circuit two identical cross-connected LC-VCOs are coupled together by directly connecting the bulk of the crossconnected transistors of one VCO to the bulk of the MOS varactors of the other VCO in such a way no extra devices are needed for coupling. Thus, no extra noise sources and power consumption are added to the core VCOs and results in high performance of QVCO. A Linear analysis of the circuit and the result of simulation in a 0.18 μm CMOS technology are presented. The same proposed coupling scheme can be used for multiphase signal generation as well. Simulation shows the proposed QVCO can operate with supply voltage as low as 0.5 V .

Design and performance analysis of low phase noise LC-voltage controlled oscillator

TELKOMNIKA, 2023

Voltage controlled oscillator (VCO) offers the radio frequency (RF) system designer a freedom to select the required frequency. Today's wireless communication system imposes a very stringent requirement in terms of phase noise generated in VCO. This study presents an inductive source degeneration technique to improve the phase noise performance of the inductance-capacitance (LC)-VCO. Double cross-coupled topology has been chosen for the proposed VCO. The post layout simulations with the parasitic resistance, inductance, capacitance (RLC) extracted view is carried out with united microelectronics corporations (UMC) 0.18 µm process by spectre simulator of cadence tools. The proposed VCO provides a phase noise of-124.3 dBc/Hz @ 1 MHz. The tuning range obtained is 19.87% with a centre frequency of 2.46 GHz which makes it suitable for industrial, scientific, and medical (ISM) band applications. It consumes a power of 2.10 mW. Also, a good figure of merit of-189 is achieved. The total layout area occupied is 477×545 µm 2 .