Thermal protection of an amplifier driving a capacitive load
AssigneeCirrus Logic, Inc.
InventorEric Lindemann
Life of this patent
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Abstract
A system for thermally protecting an amplifier driving a capacitive load may include a low-pass filter configured to filter, with a variable cutoff frequency, an input signal to generate a filtered input signal, wherein the amplifier is configured to receive the filtered input signal and amplify the filtered input signal to generate a driving signal to the capacitive load and a controller configured to receive a real-time estimate of a temperature associated with the amplifier and vary the variable cutoff frequency as a function of the temperature.
Claims18
A device, comprising:
- a capacitive load;
- a low-pass filter configured to low-pass filter, with a variable cutoff frequency, an input signal to generate a filtered input signal;
- an amplifier configured to receive the filtered input signal and amplify the filtered input signal to generate a driving signal to the capacitive load;
- and
- a controller configured to:
- receive a real-time estimate of a temperature associated with the amplifier;
- and
- vary the variable cutoff frequency as a function of the temperature.
A method for thermally protecting an amplifier driving a capacitive load, comprising:
- low-pass filtering, with a variable cutoff frequency, an input signal to generate a filtered input signal, wherein the amplifier is configured to receive the filtered input signal and amplify the filtered input signal to generate a driving signal to the capacitive load;
- receiving a real-time estimate of a temperature associated with the amplifier;
- and
- varying the variable cutoff frequency as a function of the temperature.
A system for thermally protecting an amplifier driving a capacitive load, comprising:
- a low-pass filter configured to filter, with a variable cutoff frequency, an input signal to generate a filtered input signal, wherein the amplifier is configured to receive the filtered input signal and amplify the filtered input signal to generate a driving signal to the capacitive load;
- and
- a controller configured to:
- receive a real-time estimate of a temperature associated with the amplifier;
- and
- vary the variable cutoff frequency as a function of the temperature.
Dependencies are inferred from the claim text.