Abstract:This letter presents a current-shaping technique for static MOS current-mode logic (MCML) prescalers. Simply with two extra current-shaping capacitors the self-oscillating frequecy is increased. A current vector model is also presented to illustrate the principles. The prescaler with the current-shaping technique was fabricated in a 0.18-μm CMOS technology with a reference classic one. The measurement results show that the self-oscillating frequency of the prescaler with current-shaping achieves an improvement of 10%, resulting a 6 GHz highest operating frequency while the classic one could only work at 5.3 GHz. Consequently, the current-shaping technique improves the maxim divide range of the prescaler with 13.2%. Keywords: current-mode logic, prescaler, current-shaping Classification: Integrated circuits
References[1] M. Alioto, R. Mita, and G. Plumbo, "Design of high-speed power-efficient MOS current-mode logic frequency dividers," IEEE Trans. Circuits Syst.