Multistage amplifier with local error correction
AssigneeHegel AS
InventorBent Holter
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Abstract
An amplifier stage in a series connection of such stages in a low or medium frequency analog amplifier construction, e.g. for audio, is provided with correction circuitry for dynamic cancellation of non-linearities in the stage output. The correction circuitry includes a threshold detector feeding a correction signal to an adder circuit that is inserted in the series connection. An input signal to the threshold detector is supplied from a junction where e.g. resistors coupled respectively to an input and an output of the stage, meet.
Claims13
Amplifier construction for analog signals, comprising at least one amplifier stage serially connected between an input and an output, each amplifier stage having a stage input and a stage output, wherein a non-linearity correction network associated with a respective amplifier stage comprises sensor elements connected respectively at first sensor ends to said stage input and said stage output, said sensors being interconnected at second sensor ends to a junction to provide at said junction a combined signal serving as a basis for an input signal to a threshold detector, said threshold detector being connected and operative to supply a correction signal to an adder circuit coupled into the amplifier stage series connection, thereby to counteract non-linear distortion arising in said respective amplifier stage, if a signal level of said input signal is higher than a signal threshold.
Dependencies are inferred from the claim text.