David Chandler Fletcher

US Patent:

7095285, Aug 22, 2006

Filed:

Jul 26, 2004

Appl. No.:

10/901416

Inventors:

David D. Heston - Dallas TX, US
John G. Heston - Murphy TX, US
Brian P. Helm - Sachse TX, US
Gordon R. Scott - Plano TX, US
Scott Mitchel Heston - Dallas TX, US
David R. Fletcher - Allen TX, US
William S. Kopp - Greensboro NC, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

H03F 3/04

US Classification:

330296

Abstract:

According to one embodiment of the present invention a method for biasing a power amplifier having at least one transistor exhibiting kink anomaly includes providing a bias circuit coupled to a gate of at least one transistor of the power amplifier. The method also includes providing, by the bias circuit, a bias voltage to the gate. The bias circuit has a load characteristic that intersects a current versus gate voltage curve for the gate at a frequency of operation of the power amplifier only once and that exhibits a low impedance at the intersection of the load characteristic with the current versus gate curve of the gate.

US Patent:

20160298356, Oct 13, 2016

Filed:

Dec 21, 2015

Appl. No.:

14/975959

Inventors:

David C. Fletcher - Burleson TX, US

International Classification:

E04H 17/14
E04H 17/16

Abstract:

A fence panel has a first fence post and a second fence post spaced from the first post, each post having a face oriented toward the other post. An upper tab and lower clip are mounted on each post. Each upper tab is fixed, and each lower clip is movable during assembly relative to the associated post between a lower position and a higher position. A top rail is assembled onto the upper tabs, a bottom rail is assembled onto the lower clips, and at least one fence picket is inserted between the rails. During assembly the bottom rail and pickets are moved upward together relative to the posts and toward the top rail to an assembled position for retaining each picket between the rails. The lower clips are moved to the higher position for retaining the bottom rail and pickets in the assembled position.