Turkish Journal of Electrical Engineering and Computer Sciences
Article Title
DOI
-
Abstract
The aim of this paper is 3-fold: firstly, to provide a comprehensive overview of the use of differential circuits for analogue signal processing in wireless transceivers; secondly, to describe, in detail, single-ended signal to differential conversion, and the corresponding theory of such devices, their characterisation, various methods of implementation, and comparative analyses of their performance; lastly, to propose a new transistor-based solution for wideband baluns. This novel solution is based on the current conveyor and has been modelled using the transistor parameters of a 0.35 \mu m SiGe BiCMOS technology. The salient features of the new implementation are: (a) stable 50-\Omega input port impedance and easily controllable output impedance (50 \Omega/75 \Omega/100 \Omega); (b) stable matching between the differential output ports, within 1 dB (3 dB) amplitude and 10° (20°) phase balance up to 2 GHz (3 GHz); (c) good signal quality with output signal harmonic distortion lower than 1% for peak-to-peak input signals up to 50 mV; (d) excellent S-parameter performance (0-3 GHz) with return losses lower than --10 dB, reverse signal rejection better than 20 dB, more than 25 dB isolation between the output ports, and 42 dB common-mode rejection; and (d) stable performance over a 100 °C operating temperature range. This performance advances the state of the art for single-ended to differential conversion circuits (evinced upon detailed comparisons to existent baluns).
First Page
355
Last Page
386
Recommended Citation
GODARA, BALWANT and FABRE, ALAIN (2006) "State of the Art for Differential Circuits in Wireless Transceivers: A New Wideband Active Balun in SiGe BiCMOS Technology," Turkish Journal of Electrical Engineering and Computer Sciences: Vol. 14: No. 3, Article 1. Available at: https://journals.tubitak.gov.tr/elektrik/vol14/iss3/1
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