A 25-GHz CMOS Tunable Injection Locking Quadrature LC-Divider for Multi-Channel Transceivers

A 25-GHz injection locking quadrature LC divider for multi-channel transceivers is described herein. The injection locking technique is used to eliminate the trade-off between quadrature accuracy and phase noise performance. Using harmonic balance to analyze the injection locking behavior, an analytical expression for the locking range is derived. The proposed topology allows for independent tuning of I/Q injection locking dividers resulting in a reduction phase offset. A full-rate oscillator with I/Q injection locking dividers designed in a 0.13-mum standard digital CMOS process indicates 20% frequency locking range while consuming 2.2 mA at a supply voltage of 1.2V, excluding the output buffers. It is shown that I/Q phase imbalance from inductor mismatch can be corrected up to 57 degrees