Timing circuit cad

Details Timing circuit cad Timing circuit cad

2007-04-10

2007-04-10

Dinh, Paul (Department: 2825)

Computer-aided design and analysis of circuits and semiconductor

Nanotechnology related integrated circuit design

C716S030000, C716S030000, C716S030000, C716S030000

Reexamination Certificate

active

10497730

ABSTRACT:
A method of generating a design for timing circuitry having plural rotary travelling wave component circuit sections, comprises the steps of first dividing an area to be serviced into regions each small enough for there to be negligible inter-region transmission-line delay at target operating frequency. The dividing perimeters of each said region are then divided into segments suitable for approximating lumped transmission-line LKR and relevant parameters determined so that time delays over each such segment are substantially equal to cycle time of desired frequency divided by twice the number of segments. The capacitance of each segment is determined to be substantially equal to the largest envisaged load capacitance (including or preferably differential load capacitance) plus loop-to-loop interconnect capacitance plus active device (say and usually transistor) capacitance of voltage-transition regenerative means and addition to unloaded segments of padding capacitance calculated substantially to match the lumped line capacitance, and pitch/width of differencial transmission-line conductors is calculated using Wheeler's formula constrained by metallization factor involved. Finally a suitable odd number of cross-overs of transmission-line conductors is ascertained to meet cross-talk desiderata and number of transmission line loops specified to cover the area to be serviced and their interconnections, say conveniently at corners of rectangular said regions; and account taken of up to all of interconnect inductance, conduction skin effects, cross-talk, and MOSFET parasitics at least for high frequency applications.

REFERENCES:
patent: 6460165 (2002-10-01), Ismail et al.
patent: 2003/0131329 (2003-07-01), Gonzalez
patent: 2349524 (2000-11-01), None
International Search Report; ref: PCT/GB02/05514, Jan. 29, 2004.
Wood, John. et al., “Rotary traveling-wave oscillator arrays: a new clock technology,” IEEE Journal of Solid-State Circuits, Nov. 2001, vol. 36, No. 11, pp. 1654-1665.
MultiGiG ltd: Rotary Explorer Vo. 5 User's Guide, 'online! Apr. 28, 2001, pp. 1-33.

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