An Integrated Enhanced-Locking-Range Injection-Locked. Frequency Divider with Internal VCO

Copyright 2014 IEICE. A 10.5-GHz divide-by-3 (1/3) injection-locked frequency divider (ILFD) with an internal Voltage Controlled Oscillator (VCO) that can provide extra locking range is presented. A phase tuner implemented on an asymmetric inductor is proposed to increase the locking range through even-harmonic phase tuning in addition to those achieved by other techniques. With a fixed internal injection signal power of only - 18 dBm, a 25% enhancement in the locking range from 12 to 15 MHz is achieved with the proposed phase tuning. The integrated 1/3 ILFD has a frequency tuning range of 3.3 - 4.2 GHz. It is realized in a 0.18-m BiCMOS process, occupies 0.6 mm 0.7 mm, and consumes 10.6 mA while the ILFD alone consumes 6.15 mA from 1.8-V supply.

An Integrated Enhanced-Locking-Range Injection-Locked. Frequency Divider with Internal VCO Conference Paper