3 years ago

# Characterizing Complementary Bipolar Junction Transistors by Early Modelling, Image Analysis, and Pattern Recognition.

Luciano da F. Costa

This work reports an approach to study complementary pairs of bipolar junction transistors, often used in push-pull circuits typically found at the output stages of operational amplifiers. After the data is acquired and pre-processed, an Early modeling approach is applied to estimate the two respective parameters (the Early voltage $V_a$ and the proportionality parameter $s$). A voting procedure, inspired on the Hough transform image analysis method, is adopted to improve the identification of $V_a$. Analytical relationships are derived between the traditional parameters current gain ($\beta$) and output resistance ($R_o$) and the two Early parameters. It is shown that $\beta$ tends to increase with the magnitude of $V_a$ and $s$, while $R_o$ depends only on $V_a$, varying linearly with this parameter. Several interesting results are obtained with respect to 7 pairs of complementary BJTs, each represented by 10 samples. First, we have that the considered BJTs occupy a restricted region along the Early parameter space, and also that the NPN and PNP groups are mostly segregated into two respective regions in this space. In addition, PNP devices tended to present an intrinsically larger parameter variation. The NPN group has higher $V_a$ magnitude and smaller $s$ than PNP devices. PNP transistors yielded larger $R_o$ and slightly smaller $\beta$ than NPN transistors. A pattern recognition method was employed to obtain a linear separatrix between the NPN and PNP groups in the Early space and the respective average parameters were used to estimate respective prototype devices. Two complementary pairs of the real-world BJTs with large and small parameters differences were used in three configurations of push pull circuits, and the respective total harmonic distortions were measured and discussed, indicating a definite influence of parameter matching on the results.

Publisher URL: http://arxiv.org/abs/1801.06025

DOI: arXiv:1801.06025v1

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.