A 40GHz divide-by-5 injection-locked frequency divider fabricated in a CMOS 0.18m process is presented. By utilising a series-LC bandpass filter that is connected to the common-mode node of the differential injection pair to bypass the unwanted second harmonic and produce high impedance for the desired fourth-order harmonic, the fourth-order harmonic (4f0) is peaked and mixed with input signals (at 5f0) to achieve the output frequency f0 (=5f0-4f0). With an injection power of -3dBm, the measured maximum locking range is 735MHz at a tuning voltage of 0.8V. The total locking range covers 39.36-42.1GHz as the tuning voltage rises from 0 to 1.8V. This divider consumes 18mW at 1V supply voltage.
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering