Bridged T-coil

Bridged T coil in 454 circuit. L337 and C337 constitute a bridged T coil. L336 is just a tapped T coil.

The (bridged) T-coil is a circuit topology that extends signal bandwidth.

A bridged T coil is a circuit configuration with a capacitor from input to resistive load and extends signal bandwidth (as does an unbridged T coil). The bridged T coil can also turn a complex load impedance such as an RC or a series RLC into a purely resistive load at all frequencies. A regular (not bridged by a capacitor) T coil cannot do the latter.

Bob Ross used Wang Algebra to derive equations for many different forms of the T coil. He has delivered multiple papers on high frequency design internationally.

Links

• "Who Wakes the Bugler?", in The Art and Science of Analog Circuit Design, Jim Williams (Ed.), July 1998. ISBN 978-0-7506-7062-3. → Google Books
• B. Razavi, The Bridged T-Coil, A Circuit for All Seasons. IEEE Solid-State Circuits Magazine, Fall 2015
• Paul Rako, What’s All This T-Coil Stuff, Anyhow? electronicdesign.com, 2019
• Bob Ross, T-Coil Topics DesignCon IBIS Summit, Santa Clara, CA, 2011
• P. Starič, E. Margan, Wideband Amplifiers, Part 2: Inductive Peaking Circuits
• Dennis Feucht, Handbook of Analog Circuit Design. New York: Academic Press, 1990
• E. L. Ginzton, W. R. Hewlett, J. H. Jasberg, J. D. Noe, Distributed Amplification. Proceedings of the IRE, pp 956-969, August 1948.

Documents Referencing Bridged T-coil

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Patents that may apply to Bridged T-coil

Page	Title	Inventors	Filing date	Grant date	Links
Patent US 3532982A	Transmission line termination circuit	Donald F Zeidlhack • Richard K White	1967-01-03	1970-10-06	Bridged T-coil • P6047