Peter J Doherty

Address:

162 Skyros Loop, Cary, NC 27519

VIN:

1FMFK15567LA87163

Make:

FORD

Model:

EXPE

Year:

2007

US Patent:

6370203, Apr 9, 2002

Filed:

Nov 4, 1998

Appl. No.:

09/186493

Inventors:

Ronald D. Boesch - Morrisville NC
Peter J. Doherty - Apex NC

Assignee:

Ericsson Inc. - Research Triangle Park NC

International Classification:

H04B 138

US Classification:

375297, 375298, 455522, 455 69

Abstract:

Power control circuitry for the transmitting section of a mobile terminal provides gain control for amplifiers operating at different frequencies. Preferably, one amplifier controls the signal gain the signal transmission path in the IF section and another amplifier controls gain in the signal transmission path in the radio frequency (RF) section. One variable gain amplifier may be controlled based on the strength of the received signals while the other may be controlled based on commands from the base station and/or calibration and alignment settings during manufacturing. In addition, one or both of the amplifiers may optionally be controlled in whole or in part based on calibration and/or alignment settings established during manufacturing. Preferably, the gain control signal based on received signal strength is analog based and the control signal received from the control system is a pure digital signal substantially immune to noise. In such an embodiment, the corresponding amplifier is configured to receive a digital value and provide a corresponding amplifier gain.

US Patent:

6625430, Sep 23, 2003

Filed:

Oct 5, 2001

Appl. No.:

09/971480

Inventors:

Peter J. Doherty - Apex NC

Assignee:

Ericsson Inc. - Research Triangle Park NC

International Classification:

H04B 104

US Classification:

455126, 455115, 330 51

Abstract:

The present invention relates to a method and apparatus for providing a radio frequency output to promote higher amplifier efficiencies. In one embodiment, the apparatus includes a driver and a switch that alternately connects first and second circuit paths to the driver and an antenna. A power amplifier having a first bias lead lies in the second circuit path. When low power is required, the switch connects the first circuit path to the antenna, and disconnects the first bias lead from a bias. When high power is required, the switch disconnects the first circuit path from the antenna, and connects the second circuit path and the first bias lead to the antenna and the bias, respectively.

US Patent:

7924348, Apr 12, 2011

Filed:

May 3, 2006

Appl. No.:

11/416831

Inventors:

Jeremy Goldblatt - Encinitas CA, US
John Kitt - Newbury Park CA, US
Peter Doherty - Encinitas CA, US

Assignee:

RF Magic, Inc. - San Diego CA

International Classification:

H04N 5/50
H04N 5/44

US Classification:

348731, 348725

Abstract:

An integrated circuit (IC) structure and method of distributing multiple broadband signal inputs to multiple integrated circuits, where each IC receives at least one original signal and outputs a replica of the original signals to other ICs and receives at least one replica signal output by another IC.

US Patent:

7941091, May 10, 2011

Filed:

Jun 14, 2007

Appl. No.:

11/763359

Inventors:

Peter Doherty - San Diego CA, US
John Kitt - San Diego CA, US
Jeremy Goldblatt - San Diego CA, US

Assignee:

RF Magic, Inc. - San Diego CA

International Classification:

H04H 20/71

US Classification:

455 301, 455272, 455500

Abstract:

A multi-stage signal combining network includes two or more first stage combiner circuits, two or more filters, and at least one second stage signal combiner circuit. Each of the first stage combiner circuits has two or more input ports coupled to receive a respective two or more signals, and a first combiner output port. Each of the two or more filters includes an input coupled to one first stage combiner output port and a filter output port. The at least one second stage combiner circuit includes two or more input ports, each coupled to one filter output port, and a second stage combiner output port.

US Patent:

8023912, Sep 20, 2011

Filed:

Jan 17, 2008

Appl. No.:

12/015773

Inventors:

Branislav Petrovic - San Diego CA, US
Peter Doherty - San Diego CA, US
Yong Zeng - San Diego CA, US

Assignee:

RF Magic, Inc. - San Diego CA

International Classification:

H04B 1/16

US Classification:

455140, 455 302, 455323

Abstract:

Circuits systems and methods for frequency translation and signal distribution includes a downconverter circuit having first and second inputs coupled to receive respective first and second input signals, and an output for providing a downconverted output signal. The downconverter circuit includes a mixer circuit, a first switch, and a second switch. The mixer includes a first input coupled to a reference source, a second input, and an output coupled to the downconverter circuit output. The first switch includes a first port coupled to the downconverter circuit first input, and a second port switchably coupled to the mixer circuit second input. The second switch includes a first port coupled to the downconverter circuit second input, and a second port switchably coupled to the mixer circuit second input.

US Patent:

58749217, Feb 23, 1999

Filed:

Sep 20, 1996

Appl. No.:

8/717462

Inventors:

Peter James Doherty - Apex NC
Darrell Epperson - Wake Forest NC

Assignee:

Ericsson, Inc. - Research Triangle Park NC

International Classification:

H01Q 124

US Classification:

343702

Abstract:

An apparatus for providing an antenna impedance matching network that does not include mechanical switch contacts is disclosed. A retractable antenna includes a conductive plate moveable between the extended and retracted positions of the antenna. When the conductive plate is located in the extended position an impedance matching circuit responsive to the position of the conductive plate is connected between the antenna and an amplifier of a radio telephone. In response to location of the conductive plate in the retracted position, the impedance matching circuit is shorted out such that the antenna is connected directly to the amplifier via a capacitive effect between the conductive plate and a conductive coil of the shorted out impedance matching circuit.