<p>The voltage-controlled oscillator (VCO) is the primary device in phase-locked loop (PLL) to produce local frequency. The excessive phase noise of VCOs cause PLL performance loss. This paper proposes design and optimization low power consumption for a 180 nm N-channel metal-oxide semiconductor NMOS VCO applications with P-channel PMOS varactors spiral inductors. At 2 V supply voltage, o...

The robust voltage-controlled oscillator is presented by using the constant current reference and the ring oscillator for the embedded system application. The constant current reference generates the constant current for the succeeding ring oscillator to produce a stable 4MHz oscillation frequency. The proposed VCO circuit was fabricated in a 0.35 μm CMOS technology and worked with a supply vol...

A high voltage RF oscillator circuit has been designed and constructed for driving multipole ion guides. The circuit is tunable from 500 kHz to 1.5 MHz by changing a capacitor and provides 0-1000 V(p-p) that is controlled by a 0-10 V input using a negative feedback circuit. This inexpensive circuit uses a set of high voltage transistors oscillating in tandem and does not require tuning of the r...

A low power and low-phase noise quadrature voltage controlled oscillator (QVCO) using the differential complementary Colpitts oscillator topology has been developed. A transformer inductor is used to form a differential output oscillator and the back-gate coupling technique is used to generate quadrature outputs. The advantage of proposed QVCO is analyzed in terms of power consumption, phase no...

This paper demonstrates experimentally how to reduce the nonlinearity of some analog and mixed-signal circuits by using enhanced body effect provided Fully-Depleted Silicon on Insulator (FD-SOI) CMOS technology. A current-starved inverter a Voltage-Controlled Ring Oscillator (VCRO) are considered as case studies. The is configured simple amplifier stage in which harmonic distortion can be reduc...

A simple relaxation oscillator is designed by directly coupling a RC timing network to a passive S-shaped current-controlled nonlinear resistor and is then modified for chaos. The resulting chaotic oscillator inherits the main features of the relaxation oscillator, which are its low-power consumption and low-voltage operation from single or dual power supplies. These features are attributed to ...

This paper presents the simulation analysis of a 2.4 GHz Quadrature Voltage Controlled Oscillator (QVCO), for low-power, low-voltage applications. Cross coupled LC VCO (Inductor-Capacitor Voltage Controlled Oscillator) topology is utilized to realize QVCO. With the passive coupling achieved from the MOS transistors, power consumption is minimized while maintaining a small chip area. The variabl...

A 3.2Gb/s clock and data recovery (CDR) circuit for a high-speed serial link without the reference clock is described. The CDR has a phase and frequency detector (PD and FD), which incorporates a half-rate bang-bang type oversampling PD and a half-rate frequency detector that can achieve low-jitter operation and improve pull-in range. The PD of oversamping method finds a phase error by generati...