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AssigneeTechnische Universiteit Eindhoven
InventorsAndré Veltman, Hendrikus Johannes Jacobus Domensino
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An amplifier circuit (11) for amplifying electric signals, comprising controllable switching means (2) for generating a block wave signal whose amplitude varies between first and second supply voltage values during operation, filter means (9) for filtering the block wave signal so as to produce an output signal (10). The filter means (9) comprise a self-inductance (16) and a capacitance (17). The amplifier circuit (11) furthermore comprises modulating means (3) for pulse width modulation of the block wave signal by driving the switching means (2) in response to an input signal (16) to be amplified, and correction means (12) for providing from a reference value (Uref) derived from the input signal and an output signal value proportional to the output signal (10) a correction signal for controlling the modulating means (3). In order to correct for interferences in the output signal (10), means (13) are provided for deriving a reference current (Iref) from the input signal (6) as well as means (8) for providing a filter capacitance current proportional to the current though the filter capacitance (17). The correction means (12) are arranged for providing a current correction signal from the reference current (Iref) and the filter capacitance current (18).
An amplifier circuit for amplifying electric signals comprising controllable switching means for generating a block wave signal whose amplitude varies between first and second supply voltage values during operation, filter means for filtering said block wave signal so as to produce an output signal, said filter means comprise a selfinductance and a capacitance, means for providing a filter capacitance current proportional to a current through said filter capacitance, modulating means for pulse width modulation of said block wave signal by driving said switching means in response to an input signal to be amplified, and correction means for providing from a reference value derived from said input signal and an output signal value proportional to said output signal a correction signal for controlling said modulating means, and means for deriving a reference current from said input signal, wherein said correction means are arranged for providing said correction signal as a current correction signal from said reference current and said filter capacitance current.
An audio amplifier having an amplifier circuit for amplifying electric signals, comprising controllable switching means for generating a block wave signal whose amplitude varies between first and second supply voltage values during operation, filter means for filtering said block wave signal so as to produce an output signal, said filter means comprise a selfinductance and a capacitance, means for providing a filter capacitance current proportional to a current through said filter capacitance, modulating means for pulse width modulation of said block wave signal to be amplified, and correction means for providing from a reference value derived from said input signal and an output signal value proportional to said output signal a correction signal for controlling said modulating means, and means for deriving a reference current from said input signal, wherein said correction means are arranged for providing said correction signal as a current correction signal from said reference current and said filter capacitance current.
A power amplifier having an amplifier circuit for amplifying electric signals, comprising controllable switching means for generating a block wave signal whose amplitude varies between first and a second supply voltage values during operation, filter means for filtering said block wave signal so as to produce an output signal, said filter means comprise a selfinductance and a capacitance, means for providing a filter capacitance current proportional to a current through said filter capacitance, modulating means for pulse width modulation of said block wave signal by driving said switching means in response to an input signal to be amplified, and correction means for providing from a reference value derived from said input signal and an output signal value proportional to said output to said output signal a correction signal for controlling said modulating means, and means for deriving a reference current from said input signal, wherein said correction means are arranged for providing said correction signal as a current correction signal from said reference current and said filter capacitance current.
Dependencies are inferred from the claim text.