Voltage controlled Oscillators or Ring Oscillators are crucial components in any timing and memory circuits. The goal of this paper is to do physical design for a high speed, low power consumption multistage high performance ring oscillator circuit based on 300 nm CMOS technology which provides frequency of high order (KHz). This oscillator is used for high speed wireless communication applicat...

A low phase noise CMOS complementary cross-coupled LC-tank voltage-controlled oscillator (VCO), implemented with TSMC 0.18μm 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 c...

There is several application of phase locked loop in the field of communication. It depends on the mixed signal operation. It is capable of fast locking capability. present work based on redesign of the PLL system using 90nm technology process at frequency 1 GHz and the lock time is 179.5 ns and transient analysis of the PLL is simulate between 1ns to 1000ns.it consumes the 179.5 mW power at 1....

A new quadrature voltage controlled oscillator (QVCO) circuit topology is proposed for low-voltage and low-power applications. In the proposed circuit, two oscillators with current-reused structure are coupled to each other by two P&N-MOS pairs. In this way, low phase noise quadrature signals are generated with low-voltage and low-power. The simulation is made by Cadence in chartered 0.18 μm CM...

A simple scheme is given for the realization of a voltage mode three-output sinusoidal oscillator (VMTOSO). Using this scheme a negative type second generation current conveyor, [CCII(-)]-based VMTOSO is realized. The [CCII(-)]-based VMTOSO is then transformed into a multioutput current conveyor [MOCCII]-based voltage mode eight-phase sinusoidal oscillator (VMEPSO) by replacing all the CCII(-) ...

A voltage scaling technique for energy-efficient operation requires an adaptive power-supply regulator to significantly reduce dynamic power consumption in synchronous digital circuits. A digitally controlled power converter that dynamically tracks circuit performance with a ring oscillator and regulates the supply voltage to the minimum required to operate at a desired frequency is presented. ...

We demonstrated a 10GHz low phase noise differential Colpitts Voltage-Controlled Oscillator (VCO) utilizing TSMC 0.18 m μ 1P6M CMOS process with transformer coupling technology. The transformer coupling approach not only reduces the phase noise but also improves the power consumption owing to the number of active devices can be reduced. The total power consumption of this VCO is 20 mW and there...

This paper discusses performance prediction of clock generation PLLs using a ring oscillator based VCO (RingVCO) and an LC oscillator based VCO (LCVCO). For clock generation, we generally design PLLs using RingVCOs because of their superiority in tunable frequency range, chip area and power consumption, in spite of their poor noise characteristics. In the future, it is predicted that operating ...

We present a 500-MHz, ultra-low-power phase-locked loop (PLL) realized with the near-threshold supply voltage of 0.4 V in 65-nm CMOS technology. Our PLL employs a new charge pump (CP) circuit structure that can greatly reduce CP up/down current mismatch and their variation with voltage-controlled oscillator (VCO) control voltages. The PLL consumes only 127.8 μW, which corresponds to power effic...

A completely monolithic high-Q oscillator, fabricated via a combined CMOS plus surface micromachining technology, is described, for which the oscillation frequency is controlled by a polysilicon micromechanical resonator with the intent of achieving high stability. The operation and performance of micromechanical resonators are modeled, with emphasis on circuit and noise modeling of multiport r...