Power switched amplifer
First Claim
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1. A power switched amplifier comprising:
- a switched output stage which generates an output stage voltage at an output of said output stage;
filter means connected to said output of said output stage for smoothing said output stage voltage, said filter means having a variable filter effect which acts on said output stage voltage to produce an amplifier output voltage; and
control means for generating a control signal supplied to said filter means for varying said filter effect dependent on a rate of change to be achieved for said amplifier output voltage.
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Abstract
A power switched amplifier has a switched output stage which generates an output stage voltage and a filter stage coupled to the switched output stage for smoothing the output stage voltage. The smoothing effect of the filter stage is made to be variable with a control signal. Given little outlay, such an amplifier is capable of generating a well-smoothed output voltage with a high voltage change rate.
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Citations
11 Claims
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1. A power switched amplifier comprising:
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a switched output stage which generates an output stage voltage at an output of said output stage; filter means connected to said output of said output stage for smoothing said output stage voltage, said filter means having a variable filter effect which acts on said output stage voltage to produce an amplifier output voltage; and control means for generating a control signal supplied to said filter means for varying said filter effect dependent on a rate of change to be achieved for said amplifier output voltage. - View Dependent Claims (2)
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3. A power switched amplifier comprising:
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a switched output stage which generates an output stage voltage at an output of said output stage; filter means connected to said output of said output stage for smoothing said output stage voltage, said filter means having a variable filter effect which acts on said output stage voltage; and means for generating a control signal supplied to said filter means for varying said filter effect, said filter means comprising;
a capacitance having a current path connected across said output voltage, and a control element in said current paths supplied and driven by said control signal. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11)
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Specification