James W Welch

US Patent:

8109130, Feb 7, 2012

Filed:

Aug 7, 2009

Appl. No.:

12/537910

Inventors:

Frank Dimeo, Jr. - Falls Church VA, US
Philip S. H. Chen - Bethel CT, US
Jeffrey W. Neuner - Bethel CT, US
James Welch - Clayton NC, US
Michele Stawasz - New Milford CT, US
Thomas H. Baum - New Fairfield CT, US
Mackenzie E. King - Southbury CT, US
Jeffrey F. Roeder - Brookfield CT, US

Assignee:

Advanced Technology Materials, Inc. - Danbury CT

International Classification:

G01N 33/00

US Classification:

73 3105, 73 232, 73 3101, 422 83, 422 98

Abstract:

A gas detector and process for detecting a fluorine-containing species in a gas containing same, e. g. , an effluent of a semiconductor processing tool undergoing etch cleaning with HF, NF, etc. The detector in a preferred structural arrangement employs a microelectromechanical system (MEMS)-based device structure and/or a free-standing metal element that functions as a sensing component and optionally as a heat source when elevated temperature sensing is required. The free-standing metal element can be fabricated directly onto a standard chip carrier/device package so that the package becomes a platform of the detector.

US Patent:

57480206, May 5, 1998

Filed:

Feb 2, 1996

Appl. No.:

8/595821

Inventors:

Iain Ross Mactaggart - Eden Prairie MN
James R. Welch - Maple Grove MN
Alan Fiedler - Palo Alto CA

Assignee:

LSI Logic Corporation - Milpitas CA

International Classification:

H03K 19096

US Classification:

327218

Abstract:

A high speed capture latch includes differential data inputs, a latch clock input, a boost clock input, a current steering circuit, a switched current source, a latch element and first and second boost current sources. The current steering circuit has first and second differential control terminals which are coupled to the differential data inputs and control current through first and second current paths, respectively. The switched current source is coupled between the current steering circuit and a first voltage supply terminal and has a control terminal coupled to the latch clock input. The latch element is coupled between a second voltage supply terminal and the current steering circuit and provides a latch output. The first boost current source is coupled to the first current path between the latch element and the current steering circuit and has a control terminal coupled to the boost clock input. The second boost current source is coupled to the second current path between the latch element and the current steering circuit and has a control terminal coupled to the boost clock input.

US Patent:

56940629, Dec 2, 1997

Filed:

Feb 2, 1996

Appl. No.:

8/595854

Inventors:

James R. Welch - Maple Grove MN
Iain Ross Mactaggart - Eden Prairie MN
Alan Fiedler - Palo Alto CA

Assignee:

LSI Logic Corporation - Milpitas CA

International Classification:

H03P 1300

US Classification:

327 3

Abstract:

A self-timed phase detector for detecting the phase of an input signal, such as a high speed serial data stream. The self-timed phase detector includes a precharged latch, a phase detector circuit and a data valid gate. The precharged latch has a latch input, a sample clock input and first and second complementary latch outputs. The first and second complementary latch outputs have an active state and a precharged state. The phase detector circuit is coupled to the first latch output and generates a phase signal on a phase output as a function of the phase of the input signal. The data valid gate is coupled to the phase output for passing the phase signal when the latch outputs are in the active state and for blocking the phase signal when the latch outputs are in the precharged state.