Timothy E Daughters

US Patent:

20110291857, Dec 1, 2011

Filed:

Jun 1, 2011

Appl. No.:

13/150346

Inventors:

Alexander Wayne Hietala - Phoenix AZ, US
Timothy E. Daughters - Concord MA, US

Assignee:

RF MICRO DEVICES, INC. - Greensboro NC

International Classification:

G01D 18/00

US Classification:

34087004

Abstract:

The exemplary embodiments include methods, computer readable media, and devices for calibrating a non-linear power detector of a radio frequency device based upon measurements of the non-linear power detector output and the associated power amplifier output level, and a set of data points that characterize a nominal non-linear power detector. The set of data points that characterize the nominal non-linear power detector is stored in a calibration system memory as nominal power detector output data. The measured non-linear power detector outputs, power amplifier output levels, and the nominal power detector output data is used to determine a power detector error function that characterizes the difference between the response of the non-linear power detector and the nominal non-linear power detector. The power detector error function and the nominal power detector output data are used to develop a calibrated power detector output data set that is stored in the non-linear power detector.

US Patent:

58119612, Sep 22, 1998

Filed:

Aug 1, 1996

Appl. No.:

8/691286

Inventors:

Timothy Edward Daughters - Westwood MA

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G05F 100

US Classification:

323213

Abstract:

An amplitude and phase cancellation circuit for modifying or reducing the phase and amplitude of a signal includes a quadrature hybrid having four ports. A first port receives an input signal and a fourth port outputs an output signal derived from the input signal. The remaining two ports are connected to circuit sections having tuneable and adjustable components for selectively varying the phase and amplitude of the output signal. When the output signal is combined or mixed with an external signal, the circuit allows for selective adjustment or cancellation of components of the external signal by generating an output signal having a phase angle opposite to and amplitude equal to the external signal components for which cancellation is desired.

US Patent:

50288920, Jul 2, 1991

Filed:

Apr 30, 1990

Appl. No.:

7/516391

Inventors:

Timothy E. Daughters - Methuen MA

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

H01P 1185
H03H 720

US Classification:

333164

Abstract:

An analog voltage-controlled phase shifter is disclosed which is smaller in size and provides a larger phase shift for a smaller change of capacitance of presently available voltage controlled phase shifters. These unexpected advantages are obtained by using lumped elements to simulate the normally used. lambda. /4 transmission lines of the hybrid portion of the phase shifter and by eliminating or reducing the value of the capacitors normally present at the varactor nodes of the hybrid. The capacitance fully or partially removed from the varactor nodes of the hybrid can be selectively fully or partially added to the varactors.

US Patent:

20150002220, Jan 1, 2015

Filed:

Sep 16, 2014

Appl. No.:

14/487352

Inventors:

- Greensboro NC, US
Timothy E. Daughters - Concord MA, US

International Classification:

H03F 1/02
H03F 3/24
H03F 3/19

US Classification:

330 2

Abstract:

The exemplary embodiments include methods, computer readable media, and devices for calibrating a non-linear power detector of a radio frequency device based upon measurements of the non-linear power detector output and the associated power amplifier output level, and a set of data points that characterize a nominal non-linear power detector. The set of data points that characterize the nominal non-linear power detector is stored in a calibration system memory as nominal power detector output data. The measured non-linear power detector outputs, power amplifier output levels, and the nominal power detector output data is used to determine a power detector error function that characterizes the difference between the response of the non-linear power detector and the nominal non-linear power detector. The power detector error function and the nominal power detector output data are used to develop a calibrated power detector output data set that is stored in the non-linear power detector.