Ronald J Myers

US Patent:

20040198892, Oct 7, 2004

Filed:

Mar 31, 2004

Appl. No.:

10/814714

Inventors:

Heinz Busta - Park Ridge IL, US
David Boldridge - Oswego IL, US
Ronald Myers - Aurora IL, US

Assignee:

Cabot Microelectronics Corporation

International Classification:

C08K003/04
C08K003/34
C08K003/40

US Classification:

524/495000, 524/494000, 524/492000

Abstract:

A field emitter source and method for making same. An x-ray and a high energy electron source is fabricated from the field emitter. The field emitter source composition comprises carbon black and a mixing medium. An alternative method of field emitter formulation includes providing a quantity of silica with the carbon black and a mixing medium. An x-ray source comprises a substrate and a carbon black field emitter composition provided along a surface of the substrate and an extraction grid to pull electrons from the field emitter film and a metal film biased at high voltage to accelerate the electrons. A conductive film is further provided along an upper support structure of the source, such that when the conductive film is struck by the accelerated electrons, the upper support structure converts the impinging high-energy electrons into x-rays. A high energy electron source is also disclosed similar to the x-ray source but without a conductive film and with appropriate apertures to facilitate egress of the high energy electrons.

US Patent:

61380423, Oct 24, 2000

Filed:

Dec 31, 1997

Appl. No.:

9/001625

Inventors:

Pallab Midya - Schaumburg IL
Lawrence E. Connell - Naperville IL
John Grosspietsch - Libertyville IL
Ronald Gene Myers - Scottsdale AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04Q 723
G05F 170
H02M 7155

US Classification:

455571

Abstract:

A method (300, 400), device (100, 200), phone (200) and base station (200) provide an efficient tracking power converter for variable signals. The tracking power converter includes a feedforward feedback control unit that is coupled to receive a reference signal and to receive at least one feedback signal and is used for determining an optimal control signal in accordance with a predetermined scheme, a pulse width modulation unit that is coupled to the feedforward feedback control unit and is used for modifying a duty ratio to provide a switching signal, and a power converter that is coupled to the pulse width modulation unit and to a power source and is used for providing the dynamic variable output signal.

US Patent:

61637122, Dec 19, 2000

Filed:

Feb 4, 1998

Appl. No.:

9/018818

Inventors:

David Allen Winkler - Algonquin IL
Ronald Gene Myers - Scottsdale AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 138

US Classification:

455572

Abstract:

According to the present disclosure, an inrush current limiter comprises an input (190) for connection to a supply voltage, an output (202) for connection to a load, a current limiter circuit (102), a current bypass circuit (106), and a charge status circuit (104). During the initial charging of capacitors, the current limiter circuit (102) senses a large inrush current and limits the current to a predetermined quantity. The current bypass circuit (106) is switched off during the initial charging of the capacitors. When the capacitors are charged to substantially equal the input voltage, the current bypass circuit (106) is switched on to provide a low-resistance path for the supply current to pass through. In addition, the charge status circuit (104) operates to indicate the supply voltage.

US Patent:

61309109, Oct 10, 2000

Filed:

Nov 3, 1997

Appl. No.:

8/963491

Inventors:

Dale Anderson - Ft. Worth TX
Pallab Midya - Schaumburg IL
Ronald Gene Myers - Scottsdale AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03K 708
H03K 908
H03F 338
H03G 300

US Classification:

375238

Abstract:

A method and apparatus for efficient power amplification of a wideband signal with a correspondingly wide modulation bandwidth includes an envelope detector (220), an interleaved class S modulator (270), and a power amplifier (260). The interleaved class S modulator (270) amplifies includes multiple channels (272) which each include a portion of a class S modulator. Each class S modulator has a duty cycle and time offset associated therewith. The duty cycles of the channels (272) can be the same with the time offsets different, or the duty cycles can also be different. For an interleaved class S modulator with N channels (272), the slew rate increases by as much as N, and the output ripple decreases by as much as N. sup. 2.