All-Current-Mirror Sinusoidal Quadrature Oscillators

This book has described design and analysis for developments of low-power high-frequency all-current- mirror sinusoidal quadrature oscillators (QOs). QOs typically provide two sinusoids with 90 degrees of phase difference for a variety of applications such as in receivers for wireless communication systems e.g. GSM 900 MHz, GSM 1800 MHz, PCS 1.9 GHz, Bluetooth and IEEE 802.11b & g in the 2.4 GHz band. Generally, the difficulties and challenges of implementing QOs are the required low-power consumptions and high oscillation frequency. Although, current mirrors are one of the most basic building blocks for current sources or current sinks in the design of low-cost low-power integrated circuits where the basic concepts of current mirrors have been well described in many textbooks, no other low-power high-frequency sinusoidal QOs have been specifically reported using neither internal capacitances of transistors (BJTs, MOS) nor all current mirrors.

Autorentext

Assistant Professor Dr. Adisorn Leelasantitham is currently a member of Computer and Multimedia Engineering, School of Engineering, University of the Thai Chamber of Commerce, Thailand. His research interests include analog circuits, image processing, medical images, computer graphics, AI, neural networks, embedded systems and robotics.