This paper presents a broadband frequency source featuring high technical characteristics and extended functionality. The source is a compact (5 by 7 by 1 inches) module that covers the 0.1-to-10 GHz frequency range with a 0.001 Hz step size. The module is based on a novel (patent pending) PLL design that combines fast switching speed, low phase noise, and low spurious characteristics. The meas...

A low-power monolithic clock synthesizer suitable for use in mobile P platforms is presented. Clock synthesis is accomplished using an all-Si RF LC reference oscillator that does not require an external frequency reference. Fabricated in 0.18 m CMOS, the developed clock synthesizer demonstrates 1% frequency accuracy over process, voltage, and 0-70 C, exhibits 7.4/21/33psrms period jitter on 528...

This paper presents the design consideration of high order digital AZ modulators used as modulus controller for fractional-N frequency synthesizer. A third-order MASH structure (MASH 1-2) is designed and implemented which allows for the input to operate over 75% of the input adder capacity. The number of the output levels is reduced to two bits. The circuit was verified through simulation, ASIC...

An investigation has been made to find the new frequency from a reference such is done for beneficial of day-to-day rapid increase in technology and its uses. The effect derived comparison analog circuits digital better result. A software analysis also verify Mainly regular use wireless this work compared Phase lock loop used get response crystal oscillator as frequency. It very essential compo...

Cognitive radios are expected to perform spectrum sensing and communication in the frequency range of tens of megahertz to about 10 GHz. As such, they pose tough architecture and circuit design problems. This paper deals with issues such as broadband, low-noise amplification, multidecade carrier frequency synthesis, and spectrum sensing. The paper also describes the effect of nonlinearity and l...