Miles F Thompson

Deceased

from Elgin, OR

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Digital-To-Analog Converter Calibration For Audio Amplifiers
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US Patent:

20230096254, Mar 30, 2023
Filed:

Sep 28, 2022
Appl. No.:

17/955034
Inventors:

- Irvine CA, US
Donald Allen PEARCE - Beaverton OR, US
Wai Laing LEE - Portland OR, US
Miles Reuben THOMPSON - Portland OR, US
International Classification:

H03M 1/10
H04R 1/10
H04R 3/04
Abstract:

In some embodiments, a calibration circuit can include a first circuit configured to generate a first output voltage based on a first reference voltage, and a second circuit configured to compare the first output voltage and a second reference voltage. The calibration circuit can further include a calibration block configured to provide an adjustment to the first circuit based on the comparison of the first output voltage and the second reference voltage, with the adjustment being configured to compensate for a change in the first reference voltage. In some embodiments, such a calibration circuit can be utilized for and/or be a part of a digital-to-analog converter for wireless audio applications.

Method And System For Component Mismatch Compensation
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US Patent:

20230096484, Mar 30, 2023
Filed:

Sep 29, 2022
Appl. No.:

17/936458
Inventors:

- Irvine CA, US
Miles Reuben Thompson - Portland OR, US
Mark R. Peting - Yamhill OR, US
International Classification:

G01R 29/08
H03F 3/195
Abstract:

A method and system of compensating for component mismatch are disclosed. An example system comprises an amplifier including a current ratio measurement engine (CRME) and a modulator (DSM). The CRME is configured to obtain measurements for each possible configuration of an amplifier circuit and to pass these measurements to a processor for analysis. In the example system, the measurements are obtained by driving a bias current through two or more circuit elements and measuring the ratio in current between the two or more circuit elements, which is representative of the relative mismatch between the two or more components. The DSM is configured to receive adjustment parameters from the processor and to tune the amplifier circuit according to the adjustment parameters to thereby improve the performance of the amplifier.

Loop Filter Stabilization For Class D Amplifier
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US Patent:

20230097106, Mar 30, 2023
Filed:

Sep 29, 2022
Appl. No.:

17/955637
Inventors:

- Irvine CA, US
Wai Laing Lee - Portland OR, US
Miles Reuben Thompson - Portland OR, US
International Classification:

H03F 3/217
H04R 3/00
Abstract:

Amplifying a signal includes outputting an output signal from a Class D amplifier configured to operate as a current driver to a load, such as a loudspeaker, the output of the Class D amplifier controlled by a feedback loop, and, in the feedback loop: performing analog filtering using an active analog filter on an error signal that is based on the output of the Class D amplifier and a reference signal, digitizing a filtered output of the analog filter to produce a sequence of digital values, performing digital filtering on the sequence of digital values to produce a sequence of filtered digital values, and generating a pulse signal to control the output of the Class D amplifier based on the sequence of filtered digital values. The digital filter reduces a destabilizing effect of the loudspeaker's inductance. Associated circuits, systems, modules and electronic devices are disclosed.