International Business Machines Corporation

Brian J Elliott

Gary Markovits

Eric W Hearn

An apparatus for determining pen acceleration for use in a signature vertification system. Capacitive transducer means are mounted in a pen, and change capacitance by an amount which is proportional to pen acceleration. A Blumlein bridge circuit is utilized to measure changes in the capacitance of the transducer means, and the output of the bridge is amplified and demodulated to result in a signal which is proportional to acceleration.

Apparatus for determining pen acceleration

A method or technique is disclosed for predicting precisely where oxygen precipitation will occur in semiconductor wafers that are being processed in connection with integrated circuit manufacture; the technique is based upon the discovery that such precipitation will occur at resistivity peaks measured prior to any thermal treatment of the wafers. In other words, the technique permits characterizing the wafers by the diametral resistivity profile that is obtained in the initial resistivity measurements, whereby a change in oxygen precipitation can be predicted precisely where compensated intrinsic regions have been measured in the initial measurements.

Technique for predicting oxygen precipitation in semiconductor wafers

A coaxial attenuator, for attenuating baseband picosecond pulses with Fourier components in the high microwave frequency range and for calibrating pulse measuring instruments, is disclosed. A fast pulse, propagating along the attenuator, is split into two waves at a transition plane formed by an intermediate tubular conductor and an outer conductor. The purpose of the transitional plane is, in addition to splitting the incoming wave, to attenuate the wave. One of the attenuated waves propagates along the inside of the conductor of the intermediate section to a pulse measuring instrument for viewing. The other attenuated wave is delayed before propagating along the same intermediate conductor to be viewed on said viewing device. The known time lag between the two wavefronts is used for time calibrating pulse measuring instruments.

Growing community of inventors

Yorktown Heights, NY, United States of America

Brian J Elliott