1
Michael A Sorna, Donald J Papae: Probe interface assembly. International Business Machines Corporation, Charles W Peterson Jr, September 1, 1992: US05144228 (76 worldwide citation)

A probe interface assembly connects a set of signal lines and a set of power lines from a circuit tester to one integrated circuit (IC) chip disposed among multiple circuit chips on a semiconductor wafer. The assembly includes a plurality of electrically conductive planes including metal mesh and co ...


2
Donald J Papae, Donald F Schomaker, Michael A Sorna: Low inductance side mount decoupling test structure. International Business Machines Corporation, Harry F Smith, Donald M Boles, July 21, 1992: US05132613 (45 worldwide citation)

An integrated circuit test structure is comprised of a stacked substrate MLC space transformer (5). A top surface of an interface substrate (12) is employed for decoupling capacitor (36) placement. The top surface has metal conductors (20) exposed thereon for terminating power supply buses from a te ...


3
Michael A Sorna: On-chip system and method for measuring jitter tolerance of a clock and data recovery circuit. International Business Machines Corporation, Daryl K Neff Esq, November 28, 2006: US07142623 (40 worldwide citation)

An integrated circuit is operable to measure tolerance to jitter in a data stream signal. A Clock And Data Recovery Circuit (“CDR”) thereon recovers a phase of a clock for sampling a data stream signal containing a repeatable known sequence of data values and then samples the data stream signal with ...


4
Anthony R Bonaccio, Hayden C Cranford Jr, Michael A Sorna, Sebastian T Ventrone: Method and apparatus for controlling common-mode output voltage in fully differential amplifiers. International Business Machines Corporation, Michael J LeStrange, Cantor Colburn, May 30, 2006: US07053712 (31 worldwide citation)

A method for controlling the common-mode output voltage in a fully differential amplifier includes comparing a sensed common-mode output voltage of the fully differential amplifier to a reference voltage, and generating an error signal representing the difference between the sensed common-mode outpu ...


5
Louis L Hsu, William R Kelly, Joseph Natonio, Karl D Selander, Michael A Sorna: High speed FIR transmitter. International Business Machines Corporation, Steven Capella, January 20, 2004: US06680681 (22 worldwide citation)

A transmitter for driving a transmission medium employs pre-distortion to predistort the signals leaving the driver so that they will have an acceptable shape when they reach their destination and have been distorted by imperfections in the transmission medium. The change to pulse height is accompli ...


6
Norman Hugo Walker, Victor Moy, Allan Leslie Mullgrav Jr, Michael A Sorna: Coarse calibration circuit using variable step sizes to reduce jitter and a dynamic course calibration (DCC) circuit for a 2 GHz VCO. International Business Machines Corporation, Graham S Jones II, H Daniel Schnurmann, December 9, 2003: US06661267 (18 worldwide citation)

A calibration system for a Phase Locked Loop (PLL) includes a phase/frequency detector coupled to the output of a voltage controlled oscillator (VCO) and to a source of a reference frequency. A charge pump is connected to receive an error signal from the phase/frequency detector and provide a voltag ...


7
Louis L Hsu, Brian L Ji, Karl D Selander, Michael A Sorna: Method and system for optimizing transmission and reception power levels in a communication system. International Business Machines Corporation, Daryl Neff, December 27, 2005: US06980824 (17 worldwide citation)

A method and system are disclosed herein for determining optimum power level settings for a transmitter and receiver pair of a communication system having a plurality of transmitter and receiver pairs, as determined with respect to bit error rate. In the method disclosed herein, the power levels of ...


8
Allan L Mullgrav Jr, Michael A Sorna: Linear voltage controlled oscillator transconductor with gain compensation. International Business Machines Corporation, H Daniel Schnurmann, DeLio & Peterson, October 15, 2002: US06466100 (17 worldwide citation)

A voltage controlled oscillator of a phase locked loop circuit having digitally controlled gain compensation. The digital control circuitry provides binary logic input to the voltage controlled oscillator for a digitally controlled variable resistance circuit, a digitally controlled variable current ...


9
Louis L Hsu, Karl D Selander, Michael A Sorna, William F Washburn, Huihao H Xu, Steven J Zier: Programmable peaking receiver and method. International Business Machines Corporation, Daryl K Neff, August 30, 2005: US06937054 (14 worldwide citation)

Methods and structures are disclosed herein for programmably adjusting a peaking function of a differential signal receiver. The disclosed method includes inputting a pair of differential signals to a pair of input transistors coupled to conduct currents differentially between a pair of load impedan ...


10
Stephen J Ames, Steven John Baumgartner, Kenneth Paul Jackson, Clint Lee Schow, Michael A Sorna, Steven John Zier: Optical power meter derived from common-mode voltage of optical transimpedance amplifier. International Business Machines Corporation, Karuna Ojanen, March 4, 2003: US06528777 (14 worldwide citation)

An optical transceiver with a transimpedance amplifier generates a dynamic common mode voltage of the peak-to-peak output current of the photodetector for use as an in-situ optical power meter. Peak-to-peak voltage signal are imposed on the common mode voltage so optical power measurements are obtai ...