A current reused CMOS quadrature injection‐locked frequency divider

Abstract

A fourth-order accurate FDTD scheme with long-time stability, IEEE Microwave Wireless Compon Lett 15 (2005), 271-273. 4. X. Fei and T. Xiaohong, Stability and numerical dispersion analysis of a fourth-order accurate FDTD Method, ABSTRACT: A new current-reused injection-locked frequency divider is proposed to generate quadrature outputs and implemented using the standard UMC 0.18 m CMOS 1P6M process. The proposed circuit is made of two LC-tank voltage controlled oscillators (VCOs) stacked in series and the VCOs are coupled with the coupling transistors to generate quadrature signals. The direct injection-locked technique is applied to the VCO to perform a divide by two functions, so that the quadrature circuit can provide low phase noise signal. At the 1.8 V supply voltage, the free running frequency of proposed circuit operates from 2.3 to 2.63 GHz and provides 1 GHz locking from 4.43 to 5.43 GHz. The power consumption is 7.4 mW with 4.1 mA current consumption. ABSTRACT: In this article, a novel design of printed coplanar waveguide-fed monopole antenna is proposed for triple-band WiMAX applications. At first, we investigate the printed dual-band monopole antenna for dual-band operation with two bands of 2.37-3.64 GHz and Figure 6Measured phase noises of the free-running, external injectionreference and injection-locked signals