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In this work,a novel prescaler based upon new current mode logic (CML) flip-flop architecture applied to global positioning system (GPS) receivers is proposed.Compared to traditional static current mode logic (CML) flip-flop,it introduces a clock-controlling transistor to reduce the time constant at sensing period.As a result,the speed has been maximized and the working range has been enlarged.The phase noise of local oscillator (LO) signals coming from the prescaler can be lowered by 6 dB,and the interference of voltage controlled oscillator (VCO) to radio-frequency (RF) front-end apartments (low noise amplifier,mixer,etc.) will be diminished so that the sensitivity of GPS receivers is enhanced.This prescaler’s maximum input frequency rises up to 6.9 GHz,30% higher than that of traditional architecture,and its power is only 2.16 mW when the supply voltage is 1.8 V.The prescaler was manufactured in 0.18-μm CMOS process,and it has been successfully applied to GPS receivers.
In this work, a novel prescaler based upon new current mode logic (CML) flip-flop architecture applied to global positioning system (GPS) receivers is proposed. Compared to traditional static current mode logic As a result, the speed has been maximized and the working range has been enlarged. The phase noise of local oscillator (LO) signals coming from the prescaler can be lowered by 6 dB, and the interference of voltage controlled oscillator (VCO) to radio-frequency (RF) front-end apartments (low noise amplifier, mixer, etc.) will be diminished so that the sensitivity of GPS receivers is enhanced.This prescaler’s maximum input frequency rise up to 6.9 GHz, 30% higher than that of a traditional architecture, and its power is only 2.16 mW when the supply voltage is 1.8 V. The prescaler was manufactured in a 0.18-μm CMOS process, and it has been successfully applied to GPS receivers.