| 摘要 |
An electronic class-D amplifier having an amplifier input to which an amplifier input signal may be applied, an amplifier output which may produce an amplifier output signal, an output switching stage, a pulse width modulator which includes an oscillator, wherein a first output of the oscillator produces a carrier reference signal, at least one servo-loop amplifier which includes an integrating feed forward transfer function, wherein the amplifier input is connected to an input of the servo-loop amplifier, a sample and hold element which includes a sample input and a control input, such that the sample and hold element samples a signal at the sample input when a sample command signal is applied to the control input, and the sample and hold element holds the value of the last sampled value of the signal at the sample input when the hold command signal is applied to the control input, and this said held value is applied to an output of the sample and hold element, the amplifier input is also connected to the sample input of the sample and hold element, an output of the sample and hold element is connected to a first input of an adder, and an output of the servo-loop amplifier is connected to a second input of the adder, an output of the adder is connected to a modulation input of the pulse width modulator, a second output of the oscillator is connected to the control input of the sample and hold element, an output of the pulse width modulator is connected to an input of the output switching stage, and an output of the output switching stage is connected to the amplifier output, wherein a negative feedback path connects an output of the output switching stage to an input of the servo-loop amplifier.
|
