(VCO) phase-locked loop (PLL) and ring-VCO PLL topologies with low-phase noise. Differential control loops are used for the PLL locking through a symmetrical transformer-resonator or bilaterally controlled varactor pair. A differential compensation mechanism suppresses out-band spurious tones. The prototypes of the proposed PLL are implemented in a CMOS 65-nm or 45-nm process. The measured resu...

In this paper, the design of micro-power CMOS ring VCO with minimum jitter intended for a concept of frequency synthesizer in biotelemetry systems is studied. A design procedure implemented in MATLAB is described for a circuit realization with TSMC 0.18μm CMOS technology. This conventional design methodology based on EKV3.0 model is clearly suited to the challenges of analog circuits design wit...

Voltage Controlled Oscillator (VCO) is an important building block in wireless communication system. In this paper a five stage current starved Voltage Controlled Oscillator (CMOS VCO) is designed which is used in Phase Lock Loop (PLL). The design is implemented on CADENCE VIRTUOSO Platform with high oscillation frequency and low power dissipation. The oscillation frequency of the designed VCO ...

In this letter, we present a novel receiver for time transfer that achieves picosecond accuracy through a line-of-sight link. The receiver is based on a fully integrated optically locked voltage controlled oscillator (OL-VCO) and is implemented in a commercial CMOS process. The design of optical photodiodes integrated with the OL-VCO is explained in detail. It is demonstrated that in the locked...

For high speed application, jitter is a problem to communication system, as it reduces the performance of overall circuitry. As jitter is a type of corruption that cannot be eliminated, reducing jitter is one way to help to improve the system performance. In this paper, we introduce some ways to reduce the jitter in phase-locked loop. Introduction Phase-Locked Loop, PLL, is widely used among th...

OBJECTIVE To elucidate the responsible mechanisms of increased slope of minute ventilation relative to carbon dioxide production (VE/VCO(2)) during exercise after acute myocardial infarction without overt signs of heart failure, patients who had an acute myocardial infarction were examined after participating in a three month supervised exercise training programme. DESIGN Exercise testing, hy...

OBJECTIVES The aim of the study was to test the hypothesis that leptin is involved in the regulation of ventilatory responses to exercise in chronic heart failure (CHF). BACKGROUND Exercise-induced hyperventilation is a negative prognostic factor in CHF. Studies in animals suggest that leptin, a hormone secreted by adipocytes, contributes to the regulation of respiration. Plasma leptin levels...

The 402-405 MHz MICS (Medical Implant Communication Service) band has recently been allocated by the US Federal Communication Commission (FCC) with the potential to replace the low frequency inductive coupling techniques in implantable devices. This band was particularly chosen to provide full-integration, low-power, faster data transfer and longer communication range. This paper investigates t...

A new design for an ultra-low power, low phase noise differential 10 GHz LC voltage-controlled oscillator (VCO) which is biased in the subthreshold regime, is presented in the 0.18 μm CMOS process, for the first time. The designed circuit topology is an NMOS only cross-coupled LC-tank VCO which has an extra symmetric centre tapped inductor between the source ends of the cross-coupled transistor...

This paper describes 3-GHz and 7-GHz tunableinductance LC-tank voltage-controlled oscillators (VCOs) implemented in 0.18-μm CMOS technology. Unlike the traditional tuning method by a varactor, a tunable inductor is employed in the VCO by using a transformer to compensate for the energy loss. The VCO facilitates the tuning frequency and low noise of the output signals, together with a variable i...