An inductorless frequency divider with 15GHz locking range using 90nm CMOS technology

The work proposed an inductorless divider using ring oscillator topology to save chip area and enhance the locking range. The topology uses two techniques to enhance the transconductance (g_m) for increasing locking range. To validate the proposed circuit, the chip was fabricated using TSMC 90nm CMOS technology. The core circuit only occupies an area of 70.3 ·80.15μm². Measurement shows the input frequency sweeps from 22GHz to 37GHz and results in a 15GHz locking range.