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Dive into the research topics where Robert D. Hopkins is active.

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Featured researches published by Robert D. Hopkins.


international solid-state circuits conference | 2007

High-Speed and Low-Energy Capacitively-Driven On-Chip Wires

Ronald Ho; I. Ono; Frankie Y. Liu; Robert D. Hopkins; Alex Chow; J. Schauer; Robert J. Drost

We present circuits for driving long on-chip wires through a series capacitor. The capacitor improves delay through signal pre-emphasis, offers a reduced voltage swing on the wire for low energy without a second power supply, and reduces the driven load, allowing for smaller drivers. Sidewall wire parasitics used as the series capacitor improve process tracking, and twisted and interleaved differential wires reduce both coupled noise as well as Miller-doubled cross-capacitance. Multiple drivers sharing a target wire allow simple FIR filters for driver-side pre-equalization. Receivers require DC bias circuits or DC-balanced data. A testchip in a 180 nm, 1.8 V process compared capacitively-coupled long wires with optimally-repeated full-swing wires. At a 200 mV swing, we measured energy savings of 3.8x over full-swing wires. At a 50 mV swing, we measured energy savings of 10.5x. Throughput on a 14 mm wire experiment due to capacitor pre-emphasis improved 1.7x using a 200 mV swing.


custom integrated circuits conference | 2003

Proximity communication

Robert J. Drost; Robert D. Hopkins; Ivan E. Sutherland


Archive | 2006

Measuring chip-to-chip capacitance differentials by demodulating signals over a capacitance bridge

Alex Chow; Robert D. Hopkins; Justin M. Schauer


Archive | 2012

Semiconductor die with integrated electro-static discharge device

Robert J. Drost; Robert D. Hopkins; Alex Chow


Archive | 2009

Determining chip separation by comparing coupling capacitances

Alex Chow; Robert D. Hopkins; Justin M. Schauer


Archive | 2008

Active resistor used in a feedback amplifier particularly useful for proximity communication

Alex Chow; Robert J. Drost; Robert D. Hopkins


Archive | 2006

Measuring rotational misalignment using spatial interference patterns

Alex Chow; Ronald Ho; Robert D. Hopkins


Archive | 2008

METHOD AND SYSTEM FOR SIZING FLOW CONTROL BUFFERS

Hans Eberle; Nils Gura; Wladyslaw Olesinski; Robert J. Drost; Robert D. Hopkins


Archive | 2007

Sub-sampling of weakly-driven nodes

Ronald Ho; Thomas G. O'Neill; Robert D. Hopkins; Frankie Y. Liu


Archive | 2005

Apparatus and method for high-throughput asynchronous communication with flow control

Jo C. Ebergen; Justin M. Schauer; Robert D. Hopkins; Ivan E. Sutherland

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