A D-band divide-by-6 injection-locked frequency divider (ILFD) is presented. The basic mechanism of high division ratios frequency divider is investigated. The circuit employs a wideband microstrip Lange coupler, a microstrip delay line and a pair of Cascode transistors to form a feedback loop for enhanced divide-by-6 operation. The proposed ILFD is fabricated with chip size of 0.7 × 0.9mm2 in ...

The CMOS PLL based Frequency Synthesizer is a vital role in Receiver front end Sub component. The main objective of this paper is to design a high frequency of oscillation, less phase noise and power efficient PLL. In general, the PLL contains PFD, Loop Filter, VCO and Frequency Divider. The VCO is a critical component in Phase Locked Loop for low power CMOS designs. Here the Source Coupled VCO...

We consider a model for a resonant injection-locked frequency divider, and study analytically the locking onto rational multiples of the driving frequency. We provide explicit formulae for the width of the plateaux appearing in the devil’s staircase structure of the lockings, and in particular show that the largest plateaux correspond to even integer values for the ratio of the frequency of the...

In this paper, the closed-form design method of an Nway dual-band Wilkinson hybrid power divider is proposed. This symmetric structure including N groups of two sections of transmission lines and two isolated resistors is described which can split a signal into N equiphase equiamplitude parts at two arbitrary frequencies (dual-band) simultaneously, where N can be odd or even. Based on the rigor...

In this paper, the frequency offset estimation schemes robust to the non-Gaussian noise for orthogonal frequency division multiplexing (OFDM) systems are addressed. First, a maximum-likelihood (ML) estimation scheme in non-Gaussian noise is proposed, and then a simpler estimation scheme based on the ML estimation scheme is presented. Numerical results show that the proposed schemes offer robust...

Orthogonal frequency division multiplex (OFDM) systems are particularly straightforward to understand in the frequency domain. The purpose of this paper is to draw attention to the fact that zero padded block transmissions also have a straightforward frequency domain interpretation. The advantages of this interpretation are illustrated by three additional results which further the understanding...

This paper reviews the present methods of distributing standard frequency and time signals (SFTS), which include the use of high-frequency, low-frequency, and very-low-frequency radio signals, portable clocks, satellites, and RF cables and Lines. The range of accuracies attained with most of these systems is included along with an indication of the sources of error. Information is also included...

Version 1, 6 March 2005 This paper discusses behavioral models of RF blocks. The RF blocks amplify, filter, modulate, and demodulate RF carriers. The paper classifies behavioral RF models as either passband or baseband. Like device-level models, passband models explicitly simulate every cycle of the carrier. However, baseband models suppress the carrier to trade some accuracy for a dramatic inc...