Low power differential colpitts injection-locked frequency dividers using 0.18 μm CMOS technology

摘要

In this work, two new LC injection-locked frequency dividers (ILFDs) based on voltage-controlled oscillator are proposed. One of the proposed circuits is a divide-by-2 and the other is a divide-by-3 ILFD which are realized with a current-switching colpitts LC oscillator with one/two injection capacitors, respectively. A theoretical analysis is presented which confirms the operating principle of the proposed circuits. At the supply voltage of 1.5 V, the power consumption of the divide-by-2 and divide-by-3 ILFDs is 1.581 and 1.608 mW, respectively. At the incident power of 5 dBm, the locking range of divide-by-2 divider is from the incident frequency of 10.16 to 11.33 GHz and for divide-by-3 divider is 9.08 to 10.1 GHz. The proposed ILFDs were designed using a TSMC 0.18 μm RF CMOS technology. Additionally, the Monte Carlo simulation is performed to estimate the accuracy of the proposed circuit performances under various device mismatches.