A V-Band Divide-by-4 Direct Injection-Locked Frequency Divider in 0.18-\mu\ m CMOS.

In this paper, a novel circuit topology of aCMOS divide-by-4 direct injection-locked frequency divider is presented for millimeter-wave applications. To enhance the locking range for circuit operations with a division ratio of 4, a series peaking technique is introduced in the proposed divider structure such that improved input injection efficiency can be achieved. Using a standard 0.18-\mu\ m CMOS process, a V-band frequency divider is fabricated for demonstration. Operated at a supply voltage of 1.8 V, the divider core consumes a dc power of 12.6 mW. At an incident power of 0 dBm, the fabricated circuit exhibits an input locking range of 2.44 GHz in the vicinity of 60 GHz. The measured output power and locked phase noise at 1-MHz offset are -\7 dBm and -\133 dBc/Hz, respectively. [ABSTRACT FROM AUTHOR]