| 摘要 |
Techniques for determining the impedance of a load coupled to an amplifier. In an exemplary embodiment, a mirroring transistor is provided to mirror the current through a transistor of the amplifier output stage to a predetermined ratio. The impedance of the load may be calculated based on the mirrored current and the amplifier output voltage provided to the load. In an exemplary embodiment, the mirrored current may be digitized and provided to a digital load impedance calculation block, which estimates the load impedance based on the digitized current and an indication of the amplifier output voltage. Further techniques are described for calibrating the load impedance calculation scheme, and for differentiating between stereo and mono audio plugs using said techniques.
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