Ronald T Meadows

US Patent:

20050127399, Jun 16, 2005

Filed:

Dec 12, 2003

Appl. No.:

10/734398

Inventors:

Ronald Meadows - Youngsville NC, US

International Classification:

H01L031/072

US Classification:

257194000

Abstract:

Semiconductor devices having a plurality of unit cells connected in parallel are provided. The unit cells each have a gate finger with a gate pitch between adjacent ones of the gate fingers. The gate pitch is non-uniform in a predetermined pattern.

US Patent:

60919663, Jul 18, 2000

Filed:

Sep 29, 1997

Appl. No.:

8/939870

Inventors:

Ronald C. Meadows - Zebulon NC

Assignee:

Ericsson, Inc. - Research Triangle Park NC

International Classification:

H04Q 732

US Classification:

455553

Abstract:

A power amplifier circuit for a radio transceiver has a linear mode amplifier and a saturated (nonlinear) mode amplifier, a diplex matching circuit coupled to the linear mode amplifier for impedance matching and for separating transmitted signals in a plurality of frequency bands, a low pass matching circuit coupled to the output of the saturated mode amplifier and means for selectably placing the power amplifier circuit in a linear mode for or a saturated mode, corresponding to digital and analog modes of operation of the cellular telephone, respectively. In linear or digital mode, the linear amplifier is biased in the on state and the saturated mode amplifier may be biased in the off state. Similarly, in the saturated or analog mode of operation, the saturated mode amplifier is biased in the on state and the linear amplifier may be biased in the off state. The amplifier circuit may include a switch or circuit, coupled to an output of the diplex matching circuit and the output of the low pass matching circuit, for selectably coupling the first diplex matching circuit output or the low pass matching circuit output to an output line when the amplifier circuit is selectably placed in linear mode or saturated mode, respectively.

US Patent:

62982443, Oct 2, 2001

Filed:

Jun 10, 1998

Appl. No.:

9/094515

Inventors:

Ronald D. Boesch - Morrisville NC
Ronald C. Meadows - Youngsville NC

Assignee:

Ericsson Inc. - Research Triangle Park NC

International Classification:

H04B 138
H04M 100

US Classification:

455553

Abstract:

A power amplifier circuit has a driver amplifier stage including a low band driver amplifier and a high band driver amplifier. A final amplifier stage includes a linear mode amplifier for amplifying digitally modulated signals and a saturated (nonlinear) mode amplifier for amplifying frequency modulated (analog) signals. A switching network interconnects the driver amplifier stage and the final amplifier stage. Depending on the desired mode of operation, an appropriate driver amplifier can be coupled to an appropriate final amplifier to most effectively and efficiently amplify analog or digital RF signals in either of a plurality of frequency bands. A diplex matching circuit is coupled to the linear mode final amplifier for impedance matching and for separating D-AMPS (800 MHz band) and PCS (1900 MHz band) digital signals. A power impedance matching circuit is coupled to the output of the saturated mode final amplifier.

US Patent:

6188877, Feb 13, 2001

Filed:

Oct 22, 1998

Appl. No.:

9/177233

Inventors:

Ronald D. Boesch - Morrisville NC
Ronald C. Meadows - Youngsville NC

Assignee:

Ericsson Inc. - Research Triangle Park NC

International Classification:

H04Q 732

US Classification:

455 74

Abstract:

A power amplifier circuit has a driver amplifier stage including a low band driver amplifier and a high band driver amplifier. A final amplifier stage includes a linear mode amplifier for amplifying digitally modulated signals and a saturated (nonlinear) mode amplifier for amplifying frequency modulated (analog) signals. A switching network interconnects the driver amplifier stage and the final amplifier stage. Depending on the desired mode of operation, an appropriate driver amplifier can be coupled to an appropriate final amplifier to most effectively and efficiently amplify analog or digital RF signals in either of a plurality of frequency bands. A matching circuit is coupled to the linear mode final amplifier for impedance matching and for separating D-AMPS (800 MHz band) and PCS (1900 MHz band) digital signals. A power impedance matching circuit is coupled to the output of the saturated mode final amplifier. In one embodiment, an isolator is coupled to the output of one or more of the low band or high band outputs of the duplex matching circuit.