Proportional feedback for reduced overshoot and understoot in a switched output

A method, comprising:

• receiving an input signal at a switching output stage, the switching output stage having a first switching device and a second switching device with a common output node, the first switching device being coupled to a first supply voltage and the common output node, and the second switching device being coupled to a second supply voltage and the common output node, the first supply voltage being higher than the second supply voltage;
• providing a responsive output signal to the common output node between the first supply voltage and the second supply voltage;
• pulling a control voltage of one of the first switching device and the second switching device to reduce impedance of the one of the first switching device and the second switching device in response to a determination that the output signal at the common output node is either larger than a first predetermined threshold, which is close to the first supply, or lower than a second predetermined threshold, which is close to the second supply;
• wherein a pulling strength of the pulling circuit increases as output voltage increases in response to the output voltage being larger than the first predetermined threshold, and the pulling strength of the pulling circuit increases as output voltage decreases in response to the output voltage being lower than the second predetermined threshold.

A system, comprising:

• an acoustical driver configured to convert an electrical signal into acoustical energy;
• and
• a signal driver coupled to the acoustical driver, the signal driver comprising:
• a switching output stage configured to receive an input signal and provide a responsive output signal between a first supply voltage and a second supply voltage, the switching output stage having a first switching device and a second switching device with a common output node;
• the first switching device being coupled to the first supply voltage and the common output node, and the second switching device being coupled to the second supply voltage and the common output node, the first supply voltage being higher than the second supply voltage;
• and
• a pulling circuit coupled to one of the first switching device and the second switching device, the pulling circuit configured to pull a control voltage of one of the first switching device and the second switching device to reduce impedance of the one of the first switching device and the second switching device in response to a determination that the output signal at the common output node is either larger than a first predetermined threshold, which is close to the first supply, or lower than a second predetermined threshold, which is close to the second supply;
• wherein a pulling strength of the pulling circuit increases as output voltage increases in response to the output voltage being larger than the first predetermined threshold, and the pulling strength of the pulling circuit increases as output voltage decreases in response to the output voltage being lower than the second predetermined threshold.

A method, comprising:

• receiving an input signal at a switching output stage;
• providing a responsive output signal to a common output node between a first supply voltage and a second supply voltage;
• pulling a control voltage in the switching output stage in response to a determination that the output signal exceeds a predetermined threshold;
• wherein a pulling strength of the pulling circuit is proportional to a difference between the output signal and the predetermined threshold.