| 摘要 |
Apparatus and methods minimize propagation delay distortion in a switching amplifier (111) without impacting system efficiency. Circuitry (400) is used to detect when the width of an output pulse is approaching, or is less than, the propagation delay of switching devices in the output stage and, if this is the case, the width of the output pulse is artificially adjusted a function of the delay. More particularly, on alternate pulses, the invention adds the width "N", being twice the minimum accurate width, to the desired width for output, or subtracts the desired width from the width "N" for the output while inverting the polarity of the output. In so doing, the desired width is alternately added to, and subtracted from, the width "N", thus enforcing an accurately achievable minimum pulse width without imposing error. When applied to a bridged switching output stage, system switching losses remain those of a single switching output.
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