| 摘要 |
<p>Techniques for sensing current delivered to a load by a differential output stage, e.g., in a Class D amplifier. In one aspect, voltages across sense resistors (120, 122) coupled in series with first and second branches of the differential output stage are low-passed filtered (130) and digitized (140). The sense resistors (120,122) may be coupled in series with the sources of transistors (103, 108) of the first and second branches, wherein the transistors (103, 108) are selectively switchable on and off by input driving voltages (Vin, Vip). The input driving voltages (Vin, Vip) may correspond to a ternary voltage waveform such that during a given phase, the two transistors (103, 108) coupled in series with the sense resistors (120, 122) may be turned off. Further aspects provide for having cascoded transistors, and the sense resistors being provided between a pair of cascoded transistors.</p> |
