Abstract
This paper presents the effect of bipolar junction transistors' (BJTs) parasitic elements on the decoding performance of a BiCMOS analog decoder. The transistors' parasitic effects are taken into account to develop a more accurate behavioral model of the computing nodes. The model is applied to double-binary 0.25-mum BiCMOS analog decoders. Behavioral simulations show that the BJTs' parasitic elements deteriorate the error-correcting performance of a stand-alone <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">a posteriori</i> probability (APP) decoder by 0.5 dB compared with the ideal bit error rate (BER). In a turbo scheme, the loss is reduced to 0.2 dB for a BER that is smaller than 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-2</sup> . A simple solution based on an nMOS amplifier is proposed to counterbalance the dominant parasitic element. The amplifier reduces the degradation by 0.2 dB for the APP decoder. However, the turbo decoder is improved only for a BER above 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-2</sup> .
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: IEEE Transactions on Circuits and Systems I: Regular Papers
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
