A 1.75-GHz/3-V dual-modulus divide-by-128/129 prescaler in 0.7-μm CMOS

Abstract

A dual-modulus divide-by-128/129 prescaler has been developed in a 0.7-/spl mu/m CMOS technology. A new circuit technique enables the limitation of the high-speed section of the prescaler to only one divide-by-two flipflop. In that way, a dual-modulus prescaler with the same speed as an asynchronous divider can be obtained. The measured maximum input frequency of the prescaler is up to 2.65 GHz at 5 V power supply voltage. Running at a power supply of 3 V, the circuit consumes 8 mA at a minimum input frequency of 1.75 GHz.