Systems and methods for minimizing idle channel noise in a single-ended amplifier
AssigneeCirrus Logic International Semiconductor Ltd.
InventorsChandra B. PRAKASH, Cory J. PETERSON
Life of this patent
Estimating the term…
Abstract
In accordance with embodiments of the present disclosure, a system may include a driver configured to drive a load with a single-ended driving signal and a signal return path for the load, wherein the signal return path comprises a voltage-mode driver configured to create a signal offset during an idle channel mode of the system in order to minimize idle channel noise at the load.
Claims36
A system comprising:
- a driver configured to drive a load with a single-ended driving signal;
- and
- a signal return path for the load, wherein the signal return path comprises a voltage-mode driver configured to create a signal offset during an idle channel mode of the system in order to minimize idle channel noise at the load.
A system configured to be coupled to an electromagnetic load and comprising:
- a current-sensing circuit having a sense resistor coupled between a first terminal of the electromagnetic load and an electrical node driven to a common-mode voltage;
- and
- a control circuit configured to:
- during a haptic mode of the system, couple a first terminal of the electromagnetic load to a ground voltage;
- and
- during a load sensing mode of the system for sensing a current associated with the electromagnetic load, couple the first terminal to the current-sensing circuit;
- wherein the current-sensing circuit is further configured to create a signal offset during an idle channel mode associated with the electromagnetic load in order to minimize idle channel noise at the load.
A system comprising:
- a driver configured to drive a load with a driving signal;
- and
- a processing system configured to communicatively couple to the load and configured to:
- during a normal mode of the system, cause the driving signal to have a first slew rate;
- and
- during an idle channel mode of the system, cause the driving signal to have a second slew rate higher than the first slew rate.
A method comprising:
- driving a load with a single-ended driving signal;
- and
- creating, with a voltage-mode driver of a signal return path for the load, a signal offset during an idle channel mode of a system for generating the single-ended driving signal in order to minimize idle channel noise at the load.
A method, in a system configured to be coupled to an electromagnetic load and having a current-sensing circuit having a sense resistor coupled between a first terminal of the electromagnetic load and an electrical node driven to a common-mode voltage, the method comprising:
- during a haptic mode of the system, coupling a first terminal of the electromagnetic load to a ground voltage;
- during a load sensing mode of the system for sensing a current associated with the electromagnetic load, coupling the first terminal to the current-sensing circuit;
- and
- creating, with the current-sensing circuit, a signal offset during an idle channel mode associated with the electromagnetic load in order to minimize idle channel noise at the load.
A method comprising:
- driving a load with a driving signal;
- during a normal mode of a system for driving the driving signal, causing the driving signal to have a first slew rate;
- and
- during an idle channel mode of the system, causing the driving signal to have a second slew rate higher than the first slew rate.
Dependencies are inferred from the claim text.