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Application of Ferroelectric Capacitors for Equalization of High-Speed Digital Signaling | IEEE Journals & Magazine | IEEE Xplore

Application of Ferroelectric Capacitors for Equalization of High-Speed Digital Signaling


Abstract:

This article demonstrates a novel passive equalizer topology for differential transmission lines, based on a ferroelectric capacitor. The use of this three-terminal comme...Show More

Abstract:

This article demonstrates a novel passive equalizer topology for differential transmission lines, based on a ferroelectric capacitor. The use of this three-terminal commercial ferroelectric capacitor (STPTIC-27C4 from STMicroelectronics) offers the benefits of providing 1) miniaturized size; 2) higher dielectric constant; 3) bias polarity independent tuning; and 4) wide tuning range compared to its counterpart varactor. The design methodology of the proposed design is thoroughly discussed to compensate for any channel loss at any desired data rate. The equalization effect of the proposed topology is analyzed at the output of a 40'' transmission line for a 5 Gbps data rate in both the frequency domain and time domain. Also, the impact of self-resonant frequency and {Q} -factor of the reactive components is thoroughly discussed for the first time. Besides these, the effect of resistance is discussed in detail because it controls the low-frequency response (dc region). The initial proof-of-concept design is implemented for a maximum of 5 Gbps data transmission and measured results from the prototype are in good agreement with the simulation results. Finally, a prototype with the same ferroelectric capacitor model is built and validated to mitigate the ISI impact at the output of a 17'' differential pair at a data rate of 12 Gbps.
Page(s): 988 - 994
Date of Publication: 13 July 2023

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