Steven J Chacko, Age 57470 Cedar Hill Dr, San Rafael, CA 94903

6452398, Sep 17, 2002

Nov 8, 2000

09/707781

Joel Libove - Orinda CA, 94563
Steven Chacko - Novato CA, 94945
Jerome Singer - Berkeley CA, 94705

G01R 1506

324457, 324126, 324539

An apparatus for performing non-contacting measurements of the voltage of a conductor includes a conducting membrane coupled to a transducer. The membrane is driven with an A. C. reference voltage, creating alternating attractive and repulsive electrostatic forces caused by the difference in potential between the membrane and the conductor. The transducer generates a signal having the same frequencies as the forces on the membrane, and the amplitudes of the A. C. components are proportional to the unknown voltage on the conductor. By dividing the amplitude of the A. C. components, an accurate determination of the unknown voltage is calculated A plurality of membranes and transducers may be arrayed to provide an image of multiple voltage readings. In addition, it is also possible to measure A. C. and D. C. voltage on the center conductor of an insulated wire without the need to pierce the insulation.

6642878, Nov 4, 2003

Aug 13, 2002

10/218860

Joel M. Libove - Orinda CA
Steven J. Chacko - Mill Valley CA

Furaxa, Inc. - Orinda CA

H03M 166

341144, 341145

A method and apparatus for generating multiple ultra-fast (picosecond-range) electrical sampling apertures and pulses in response to a slewed control signal is disclosed. In one embodiment a series or sequence of sampling apertures are formed for sampling an input signal without the use of delay lines. In another embodiment, the input to be sampled is incrementally delayed to generate signals along a delay line. The delayed signals are simultaneously sampled in a sampling window to obtain a group of samples of an input signal at the same time. In another embodiment, a series or sequence of ultra-fast pulses are formed in an output signal without using delay lines. Parallel and serial sampler/pulser circuitry are disclosed.

6433720, Aug 13, 2002

Jun 6, 2001

09/876016

Joel M. Libove - Orinda CA
Steven J. Chacko - Oakland CA

Furaxa, Inc. - Orinda CA

H03M 166

341144, 341145

A method and apparatus for generating ultra-fast (picosecond-range) electrical sampling apertures and pulses, requiring only a single transition of a control signal, is disclosed. Implemented in a novel circuit architecture that is suited to fabrication as a low-cost monolithic integrated circuit, the method produces more stable, more reproducible, and more precisely shaped sampling apertures and pulses, with lower power usage and cost, than conventional techniques. The combination of speed and reproducibility enabled by the invention allows the integration of large numbers of virtually identical fast sampling apertures or pulse generators on a single IC, enabling single-shot capture of such a rapid sequence of samples that even a single cycle of a very fast, microwave frequency, electronic waveform may be precisely sampled at multiple points.