Mitchell D Johnson

US Patent:

6545873, Apr 8, 2003

Filed:

Sep 29, 2000

Appl. No.:

09/676383

Inventors:

Jake J. Han - Coppell TX
Mitchell Kevin Johnson - McKinney TX

Assignee:

Samsung Electronics Co., Ltd. - Suwon

International Classification:

H05K 700

US Classification:

361728, 361688, 174252

Abstract:

There is disclosed a printed circuit board assembly mounting tray combined with a hinged thermal tray. The thermal tray, having a plurality of heat pipes and a thermal hinge, transfers heat gathered from heat sources scattered on the printed circuit board assembly and conducted to the mounting tray. The thermal hinge provides a heat transfer connection between the thermal tray and an external heat dissipation apparatus. Additionally, the thermal tray and thermal hinge combination provides easy inspection, board installation and serviceability.

US Patent:

6603810, Aug 5, 2003

Filed:

Dec 30, 1999

Appl. No.:

09/475604

Inventors:

George A. Bednekoff - Plano TX
Mitchell K. Johnson - McKinney TX

Assignee:

Samsung Electronics Co., Ltd. - Suwon

International Classification:

A04B 1700

US Classification:

375228, 375345

Abstract:

A measurement and calibration circuit is disclosed for use in a RF transceiver comprising an antenna and a RF receiver, having a receive path, coupled to the antenna. The measurement and calibration circuit comprises: a test signal generator for generating a known amplitude and frequency test signal; a switch having an input coupled to the test signal generator, a first output coupled to an input of the receive path, and a second output coupled to the antenna; a test controller for causing the switch to directly inject the test signal into the input of the receive path and causing the switch to inject the test signal into the antenna, wherein the antenna at least partially reflects the test signal into the receive path; and a signal monitor coupled to an output of the receive path for measuring the direct injected test signal and the reflected test signal.

US Patent:

6801788, Oct 5, 2004

Filed:

Aug 23, 1999

Appl. No.:

09/379551

Inventors:

John S. Csapo - Dallas TX
Mitchell Johnson - McKinney TX
Bruce F. Brady - Benbrook TX
Mark C. Chien - Plano TX
Robert A. Rapp - Carrollton TX

Assignee:

Samsung Electronics Co., Ltd. - Suwon

International Classification:

H04B 138

US Classification:

455561, 4555501, 455500

Abstract:

A telecommunication base station transceiver subsystem that can be easily configured to provide single or multi-carrier frequency service. The base station is divided into a main unit and a radio unit such that the radio unit is positioned proximate to the antennas and the main unit is remotely located from the radio unit. A single base station transceiver can provide service via multiple wireless protocols, such as CDMA, TDMA, GSM or Analog. The base station transceiver. can also operate on various transmit/receive frequencies as well as variable transmit power settings. Furthermore, the base station transceiver can be reprogrammed, reconfigured and/or statused by a network operations center.

US Patent:

6847813, Jan 25, 2005

Filed:

Dec 27, 2001

Appl. No.:

10/034773

Inventors:

Timothy Harold Ashley - Allen TX, US
Mitchell Johnson - McKinney TX, US

Assignee:

Samsung Electronics Co., Ltd. - Suwon

International Classification:

H04B 128

US Classification:

455333, 455280, 455269, 455 82, 343702, 343888, 343900, 333 12, 333116, 333128

Abstract:

A radio frequency connector that protrudes through a printed circuit board is comprised of threaded leads. A center conductor is shielded when a shielding connector cap, having a threaded inner portion, screws onto the threaded leads.

US Patent:

7502355, Mar 10, 2009

Filed:

Feb 22, 2006

Appl. No.:

11/359675

Inventors:

George Bednekoff - Plano TX, US
Philip B. Davis - Richardson TX, US
Michael A. Hinz - Plano TX, US
Viet Huynh - Murphy TX, US
Mitchell K. Johnson - McKinney TX, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04H 20/67

US Classification:

370339, 370328, 370336, 370461, 455137, 455273, 4555621, 455561

Abstract:

A radio frequency (RF) power combiner for connecting multiple base transceiver stations with one antenna assembly includes at least one combining device coupled to at least two base transceiver stations for combining signals generated thereby into a combined signal for being transmitted by the antenna assembly. At least one frequency selective RF power detector is coupled to one of the signals generated from one of the base transceiver stations for generating an output indicating whether the signal at a predetermined frequency is present. A logic control module is coupled to the frequency selective RF power detector for generating a control signal in response to the output of the detector. An oscillator is coupled to the logic control module for generating a carrier signal at the predetermined frequency for the combined signal in response to the control signal.

US Patent:

62723367, Aug 7, 2001

Filed:

Dec 30, 1998

Appl. No.:

9/222899

Inventors:

Mark J. Appel - Richardson TX
Mitchell K. Johnson - McKinney TX

Assignee:

Samsung Electronics Co., Ltd.

International Classification:

H04Q 720

US Classification:

455423

Abstract:

There is disclosed a power control circuit for controlling the combined effective DC bias current of a bank of parallel RF power amplifiers disposed in the transmit path of an RF transmitter. The power control circuit comprises: 1) a first signal monitor for monitoring the level of a modulated RF output signal; and 2) an amplifier bias current controller for comparing the modulated RF output signal level and a known maximum output power parameter of the active RF power amplifiers to determine if the active RF power amplifiers are operating in the linear region. If the active RF power amplifiers are operating in or near the nonlinear region, the power control circuit enables one or more inactive RF power amplifiers to increase the effective combined DC bias current and linearity of the active RF power amplifiers. Conversely, if the active RF power amplifiers are operating well within the linear region, the power control circuit may disable one or more active RF power amplifiers in order to reduce the effective combined DC bias current of the active RF power amplifiers and save power.