Theodore Georgantas

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The drive for cost reduction has led to the use of CMOS technology in the implementation of highly integrated radios. This paper presents a single-chip 5-GHz fully integrated direct conversion transceiver for IEEE 802.11a WLAN systems, manufactured in 0.18m CMOS. The IC features an innovative system architecture which takes advantage of the computing(More)
Last mile residential connectivity and the demand for increased indoor coverage and capacity in 3G cellular systems has led to the commercial introduction of femtocell (Home Node B) base stations. To achieve higher component integration, support additional functionality, and decrease power, there is a need to minimize component count, PCB area and power(More)
A dual band, 5.15GHz-5.35GHz, 2.4GHz-2.5GHz, zeroIF transceiver is fabricated on a 0.18μm CMOS process. The fully integrated synthesizer and VCO achieve an integrated phase error of 0.8 at 5GHz. The transmitter achieves –33dB EVM, while the receiver features a 5.2dB noise figure (NF) at 5.25GHz and 3.5dB NF at 2.45GHz. An architecture including feedback(More)
A single-chip 2.4 GHz, zero-IF transceiver for IEEE 802.11 b/g WLAN systems is fabricated on a 0.18 /spl mu/m CMOS technology. Based on an innovative system architecture using digital calibration, analog circuit imperfections are eliminated. The transceiver features enhanced phase noise performance with the use of a fractional-N synthesizer. A switched(More)
The display and manipulation of medical images is becoming a very important part of PACS (Picture Archiving and Communication Systems) and HIS (Hospital Information Systems) [6]. The access and manipulation of medical images in digital form require different functionalities. The most common are visualization, image file transfer, storage in a database etc.(More)
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