Patent ID: 8049557
Filing Date: 2011-11-01
Classification: H03F

Abstract:
1. 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, said zero crossing detector unit being 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, wherein said 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; and a device output for providing said actual device output signal; wherein said amplification device further comprises a control loop placed around 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, said forward filter comprising an integrating filter; and an adder provided within the control loop between the output of the forward filter and the amplifier unit, the device input signal being connected to the adder, the amplifier unit having a first transfer function, and the zero crossing detector comprising a deviation filter having a second transfer function, such that the second transfer function mimics the first transfer function.