A wide-tuning range transformer-based RF CMOS oscillator.

摘要

In this thesis a method of producing a VCO with a wide enough tuning range, such that the correct centre frequency can be ensured, is presented. This is achieved without compromising the power consumption of the circuit. The work is novel in that a transformer is preferred to an inductor to help maximize this tuning range. The design was fabricated in a CMOS 0.18μm technology, and has a frequency tuning range lying between approximately 2.0 and 2.8 GHz, drawing 20mA from a 1.8V supply. A staggered-tuning range was employed to minimize the effect of noise on the analog control voltage, so the control process is a dual one, with both analog and digital controls. The oscillator produces quadrature outputs which are essential for many transceiver systems. Two chips have been submitted for fabrication. The second design will be tested in November 2001.