Ronald L Myers

US Patent:

6486733, Nov 26, 2002

Filed:

Dec 27, 2000

Appl. No.:

09/749104

Inventors:

Ronald Gene Myers - Scottsdale AZ
Bernard Eugene Sigmon - Gilbert AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03F 338

US Classification:

330 10, 330127, 330136, 330207 A, 330251, 330297

Abstract:

A method and apparatus for efficient power amplification of a wideband signal with a correspondingly wide modulation bandwidth includes splitting means ( ), class-G amplifier/modulator ( ), and power amplifier ( ). Three-level class-G amplifier/modulator ( , FIG. ) comprises operational amplifier circuits ( ), three-state selection circuit ( ), switch driver circuit ( ), drive signal routing circuit ( ), power stage circuit ( ), and filter network ( ). Multiple power stages are multiplexed based on the amplitude of the envelope signal.

US Patent:

59297760, Jul 27, 1999

Filed:

Mar 23, 1998

Appl. No.:

9/046013

Inventors:

Keith Vaclav Warble - Chandler AZ
Ronald Gene Myers - Scottsdale AZ
Dean Lawrence Cook - Mesa AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 104

US Classification:

34082544

Abstract:

An rf transmitter (319) used with a single cell battery (101) includes a voltage boost circuit (211) integral with a class S amplifier (290). An rf signal to be amplified is separated into its envelope (amplitude) and phase components. The phase component is applied to the input of a power amplifier (260). The envelope is applied to a pulse width modulator (275) which is used to modulate the voltage supplied to the power amplifier (260). The pulse width modulator (275) controls electronic switches (285, 286) which are disposed between the single cell battery (101) and the primary of a step up transformer (211). The secondary of the transformer (211) is coupled to supply voltage to the power amplifier (260). In this manner, the class S amplifier is powered directly from the single cell battery, via a the transformer (211), and power consumption is substantially reduced due to the switching operation of the switches (285, 286).

US Patent:

61380423, Oct 24, 2000

Filed:

Dec 31, 1997

Appl. No.:

9/001625

Inventors:

Pallab Midya - Schaumburg IL
Lawrence E. Connell - Naperville IL
John Grosspietsch - Libertyville IL
Ronald Gene Myers - Scottsdale AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04Q 723
G05F 170
H02M 7155

US Classification:

455571

Abstract:

A method (300, 400), device (100, 200), phone (200) and base station (200) provide an efficient tracking power converter for variable signals. The tracking power converter includes a feedforward feedback control unit that is coupled to receive a reference signal and to receive at least one feedback signal and is used for determining an optimal control signal in accordance with a predetermined scheme, a pulse width modulation unit that is coupled to the feedforward feedback control unit and is used for modifying a duty ratio to provide a switching signal, and a power converter that is coupled to the pulse width modulation unit and to a power source and is used for providing the dynamic variable output signal.

US Patent:

59429380, Aug 24, 1999

Filed:

Dec 29, 1997

Appl. No.:

8/998749

Inventors:

Ronald Gene Myers - Scottsdale AZ
Bernard Eugene Sigmon - Gilbert AZ
Robert Michael Jackson - Gilbert AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03F 338

US Classification:

330 10

Abstract:

A method and apparatus for efficient power amplification of a modulated signal includes an envelope detector (220), an multi-output class S modulator (270), a driver amplifier (250), and a power amplifier (260). The multi-output class S modulator (270) amplifies the envelope of the input signal and generates a primary amplified envelope signal and at least one offset amplified envelope signal. The offset amplified envelope signal is used to modulate the driver amplifier (250), and the primary amplified envelope signal is used to modulate the power amplifier (260).

US Patent:

58314750, Nov 3, 1998

Filed:

Aug 4, 1997

Appl. No.:

8/905698

Inventors:

Ronald Gene Myers - Scottsdale AZ
Bernard Eugene Sigmon - Gilbert AZ
Frederick Herbert Raab - Burlington VT

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03F 338
H03G 320

US Classification:

330 10

Abstract:

A method and apparatus for efficient power amplification with low distortion includes a surface acoustic wave delay line (210), an envelope detector (220), an envelope amplifier (270), and a power amplifier (260). An envelope amplifier (270) includes a pulsewidth modulator (275), a driver (280), switching transistors (285), and a low pass filter (290). The surface acoustic wave delay line (210) functions to balance the delay of the envelope and the carrier of the signal to be amplified. The use of the surface acoustic wave delay line (210) obviates the need for a separate delay line in the phase path of the amplifier.

US Patent:

58617779, Jan 19, 1999

Filed:

Jul 2, 1997

Appl. No.:

8/887063

Inventors:

Bernard Eugene Sigmon - Gilbert AZ
Ronald Gene Myers - Scottsdale AZ
Robert Michael Jackson - Gilbert AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03G 330

US Classification:

330136

Abstract:

A method and apparatus for efficient power amplification with low phase distortion includes an envelope detector (30), a scaling amplifier (40), a driver amplifier (50), and a power amplifier (60). The scaling amplifier (40), in response to the envelope signal from the envelope detector (30), generates a bias signal which causes predistortion in the driver amplifier (50). The predistortion in the driver amplifier (50) compensates for phase distortion in the driver amplifier (50) and the power amplifier (60), resulting in low phase distortion output. An EER-type amplifier (200) with high efficiency utilizes the predistortion of a driver amplifier (250) to compensate for phase distortion in the driver amplifier (250) and a power amplifier (260).

US Patent:

59907355, Nov 23, 1999

Filed:

Apr 1, 1998

Appl. No.:

9/053224

Inventors:

Bernard Eugene Sigmon - Gilbert AZ
Ronald Gene Myers - Scottsdale AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03F 338

US Classification:

330 10

Abstract:

A method and apparatus for efficient power amplification of a wideband signal with a correspondingly wide modulation bandwidth includes an envelope detector (220), an multi-stage class S modulator (270), and a power amplifier (260). The multi-stage class S modulator (270) includes multiple stages (480), where each stage includes a pair of switching transistors (430, 440) and a capacitor (450). The capacitor (450) supplies the inrush current requirements of the stage (480) so that filtering at the switching frequency is substantially provided within the stage (480). Multiple stages (480) are included on a single semiconductor substrate resulting in higher switching frequencies, higher modulation bandwidths, and lower external filtering requirements.

US Patent:

61637122, Dec 19, 2000

Filed:

Feb 4, 1998

Appl. No.:

9/018818

Inventors:

David Allen Winkler - Algonquin IL
Ronald Gene Myers - Scottsdale AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 138

US Classification:

455572

Abstract:

According to the present disclosure, an inrush current limiter comprises an input (190) for connection to a supply voltage, an output (202) for connection to a load, a current limiter circuit (102), a current bypass circuit (106), and a charge status circuit (104). During the initial charging of capacitors, the current limiter circuit (102) senses a large inrush current and limits the current to a predetermined quantity. The current bypass circuit (106) is switched off during the initial charging of the capacitors. When the capacitors are charged to substantially equal the input voltage, the current bypass circuit (106) is switched on to provide a low-resistance path for the supply current to pass through. In addition, the charge status circuit (104) operates to indicate the supply voltage.