Variable output resistance in a playback path with open-loop pulse-width modulation driver
US10644661B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 2018 |
| Grant date | May 5, 2020 |
| Priority date | — |
| Expiry date | Nov 14, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/387
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a signal path comprising an analog path portion configured to operate in a plurality of output impedance modes including a high impedance mode with a first impedance and a low impedance mode with a second impedance, and a digital path portion having a variable digital gain and configured to convert a digital input signal and into an analog signal provided to the analog path portion, a method may include responsive to a condition for switching between the high impedance mode and the low impedance mode or vice versa, transitioning the output impedance continuously or in a series of steps between the first impedance and the second impedance or vice versa and, contemporaneously with transitioning the output impedance, transitioning the variable digital gain continuously or in a series of steps such to maintain a substantially constant overall path gain for the signal path remains substantially constant during transition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.