Nathan Alan Johanningsmeier, Age 46Mount Sharp, TX

2012008, Apr 5, 2012

Sep 30, 2010

12/895526

Aleksandar Pance - Saratoga CA, US
Paul Gerard Puskarich - Palo Alto CA, US
Craig Leong - San Jose CA, US
Ronald Nadim Isaac - San Jose CA, US
Ruchi Goel - San Jose CA, US
Jim Lynn Tenneboe - Scotts Valley CA, US
Daniel Culbert - Los Gatos CA, US
Niel Warren - Soquel CA, US
Nathan Alan Johanningsmeier - San Jose CA, US

Apple Inc. - Cupertino CA

H04R 1/02
H04R 29/00

381 59, 381386

An electronic device having an enclosure including an upper panel and a bottom panel operably connected to the upper panel. A transducer is operably connected to the enclosure and the transducer is configured to mechanically vibrate the enclosure. The transducer includes an electromagnet, a magnet in communication with the electromagnet and a bracket substantially surrounding the electromagnet and the magnet, the bracket substantially secures the transducer to the bottom panel.

2020010, Apr 2, 2020

Nov 19, 2018

16/195546

- Cupertino CA, US
Troy A. Murphy - San Jose CA, US
Nathan A. Johanningsmeier - San Jose CA, US

H03F 3/217
H03F 3/183
H03F 1/56
H04R 3/00

An audio amplifier has a first H bridge and a second H bridge, to drive a speaker as a load. The second H bridge drives the speaker through resistors for increased output impedance. Control logic operates the first H bridge as a class D amplifier for larger amplitudes of audio signal, and operates the second H bridge as a class D amplifier for smaller amplitudes of audio signal. Other aspects are also described and claimed.

2019034, Nov 14, 2019

May 8, 2018

15/974635

- Cupertino CA, US
Nathan A. Johanningsmeier - San Jose CA, US
James B. Reedy - San Jose CA, US

G06F 13/372
H04R 3/00
G06F 1/20

A group of transistors is configured to drive a bus at time slots, to express data on the bus. The group of transistors dissipates an amount of electrical energy when driving the bus to a logic level opposite to a logic level present on the bus in an immediate preceding time slot. The group of transistors is arranged to dump another amount of electrical energy. Dumping of the other amount of electrical energy is responsive to driving the bus to a logic level that is the same as present on the bus in an immediate preceding time slot. The dumped amount of electrical energy is equivalent to the amount of energy dissipated by the transistors when transitioning the bus to a different logic level. Other aspects are also described.

2018022, Aug 2, 2018

Jan 27, 2017

15/418395

- Cupertino CA, US
Girault W. Jones - Los Gatos CA, US
Nathan A. Johanningsmeier - San Jose CA, US

H04R 1/04
H02M 7/25
H04R 3/00

An analog to digital conversion circuit receives a transducer output signal and outputs a data bitstream, where a latch or flip flop has an input that receives a clock signal. An AC-DC power converter receives the clock signal and produces a DC voltage which may power the analog to digital conversion circuit. The AC-DC power converter has a rectifier, an energy store and a voltage regulator, charge pump or filter, which draws power from the energy store to produce the DC voltage. A control circuit delays replenishment of the energy store by the rectified clock signal, responsive to the clock signal. Other embodiments are also described and claimed.

2018003, Feb 8, 2018

Jan 27, 2017

15/417962

- Cupertino CA, US
Nathan A. Johanningsmeier - San Jose CA, US

G01N 29/24
G01D 5/24

An excitation signal is produced on a plate of an unknown capacitor and on a plate of a known capacitor. The excitation signal is amplified over time to produce a first output signal, with gain that is proportional to capacitance of the unknown capacitor. The excitation signal is also amplified over time to produce a second output signal, with gain that is proportional to capacitance of the known capacitor. Capacitance of the unknown capacitor is computed using a mathematical function of the first and second output signals and the capacitance of the known capacitor, while being insensitive to amplitude of the excitation signal. Other embodiments are also described and claimed.

2017027, Sep 21, 2017

Mar 15, 2016

15/070508

- Cupertino CA, US
Roderick B. Hogan - San Francisco CA, US
Nathan A. Johanningsmeier - San Jose CA, US

H02M 3/07
H03F 3/19
H03F 3/183

A charge pump circuit having first and second input nodes to be coupled to a first power source, and top and bottom output nodes and an intermediate node. The charge pump circuit produces i) a voltage at the top output node that is higher than a voltage of the intermediate node, and ii) a voltage at the bottom output node that is lower than the voltage of the intermediate node. A bias voltage source has i) an input that is to be coupled to a second power source and ii) an output that produces an output voltage, which is a predetermined proportion of an input voltage at the input and that follows the input voltage downward and upward as the input voltage sags and recovers, respectively. The output of the bias voltage source is directly connected to the intermediate node of the output stage. Other embodiments are also described.

2016016, Jun 9, 2016

Dec 8, 2014

14/563990

- Cupertino CA, US
Matthew A. Donarski - San Jose CA, US
Andrew P. Bright - San Franciso CA, US
Joss N. Giddings - San Francisco CA, US
Ron A. Hopkinson - Campbell CA, US
Nathan A. Johanningsmeier - San Jose CA, US
William F. Leggett - San Jose CA, US
Mikael M. Silvanto - San Francisco CA, US

H04R 1/02

A computer system having a loudspeaker mounted on a main logic board by a hermetic seal, is disclosed. More particularly, embodiments of the computer system include an acoustic cavity defined between the loudspeaker, the main logic board, and the hermetic seal. Embodiments of the computer system may include a compressible seal separated from the hermetic seal by the loudspeaker and/or the main logic board. The compressible seal may define an acoustic channel and the loudspeaker may emit sound in a high frequency range through the acoustic channel toward a system exit. Other embodiments are also described and claimed.

2015038, Dec 31, 2015

Jun 26, 2014

14/315863

- Cupertino CA, US
Girault W. Jones - Los Gatos CA, US
Nathan A. Johanningsmeier - San Jose CA, US

H04R 3/00

A method for audio signal processing, where an audio amplifier drives a load through a connector, using 1) an input audio signal, and 2) a signal from a return pin of the connector. Output headroom of the audio amplifier is automatically detected, while the amplifier is driving the load. A variable resistor circuit that is coupled to provide variable resistance between the return pin of the connector and a ground plane, is automatically adjusted, in response to the detected output headroom of the amplifier. Other embodiments are also described and claimed.