A 10.5-GHz divide-by-3 injection-locked frequency divider with enhanced locking range by even-harmonic phase tuning in 0.18 m BiCMOS
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A fully integrated 10.5-GHz divide-by-3 (1/3) injection-locked frequency divider (ILFD) that can provide extra locking range is presented. The ILFD consists of a previously measured on-chip 10.5-GHz voltage controlled oscillator (VCO) functioning as an injection source, a 1/3 ILFD core, and an output inverter buffer. A phase tuner implemented using an asymmetric inductor is proposed to increase the locking range through even-harmonic phase tuning. 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 proposed even-harmonic phase tuning can be used to provide extra locking range to those achieved by other techniques. The proposed integrated 1/3 ILFD has a frequency tuning range of 3.3-4.2 GHz. It is realized using a 0.18-m BiCMOS process, occupies 0.6 mm 0.7 mm, and consumes 10.6 mA while the ILFD core alone only consumes 6.15 mA from 1.8-V supply voltage. 2014 Wiley Periodicals, Inc.
Microwave and Optical Technology Letters
author list (cited authors)
Lee, S., Jang, S., & Nguyen, C.
complete list of authors
Lee, Sanghun||Jang, Sunhwan||Nguyen, Cam