Amplifiers – With semiconductor amplifying device – Including distributed parameter-type coupling
Reexamination Certificate
2007-10-09
2007-10-09
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including distributed parameter-type coupling
Reexamination Certificate
active
11117935
ABSTRACT:
Provided herein is a non-uniform multi-stage distributed circuit capable of operation with an improved gain-bandwidth product. The circuit can include an input port, an output port and a transmission line coupled therebetween. Two or more amplifier stages can be coupled successively to the transmission line. Each amplifier stage can include a transistor having a transistor parameter, which can be scaled to be less than the transistor parameter of any preceding amplifier stage. The inductance of each portion of the transmission line between adjacent stages can also be scaled to be less than the inductance of the portion of the transmission line between any preceding amplifier stages. The inductance can be scaled in addition to or instead of the transistor parameter.
REFERENCES:
patent: 6597243 (2003-07-01), Fratti
patent: 7129783 (2006-10-01), Young et al.
Ahmad Yazdi et al., “A 1.8V Three-Stage 25 GHz 3dB-BW Differential Non-Uniform Downsized Distributed Amplifier”, 2005 IEEE International Solid-State Circuits Conference, Session 8, pp. 10-12.
Ahmad Yazdi and Payam Heydari, “The Design and Analysis of Non-Uniform Down-Sized Differential Distributed Amplifiers”, 2004 IEEE Symposium on Quality Electronic Design, pp. 528-533, Jun. 2004.
Ahmad Yazdi and Payam Heydari, “A Novel Non-Uniform Distributed Amplifier”, IEEE International Symposium on Circuits and Systems, vol. 1, pp. 613-616, May 2004.
Heydari Payam
Yazdi Ahmad
Orrick Herrington & Sutcliffe LLP
Regents of the University of California
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