| 摘要 |
The present invention is related to an amplification device, comprising: a device input for receiving a device input signal; an amplifier unit comprising a zero crossing detector unit, an output filter and a lead-lag compensation network. The zero crossing detector unit is arranged for comparing said device input signal with a reference potential and for switching a pulse width modulated detector output signal between a first voltage level and a second voltage level dependent on said comparison. The amplifier unit is arranged for providing an actual device output signal, said actual device output signal being an amplified representation of said device input signal. The amplification device further comprises a device output for providing said actual device output signal, and a control loop bridging said amplifier unit and comprising a forward filter for increasing loop gain for improving a signal-to-noise ratio of said actual device output signal. The forward filter comprises an integrating filter. The amplification device further comprises a deviation detection unit arranged for detecting overmodulation of said amplifier unit, wherein said amplification device is arranged for disabling the functioning of said forward filter for said amplification device upon occurrence of overmodulation of said amplifier unit. |
