Circuit arrangement having a switching amplifier

Details Circuit arrangement having a switching amplifier Circuit arrangement having a switching amplifier

H - Electricity

04

R

H04R 25/00 (2006.01) H03F 3/217 (2006.01) H03G 3/00 (2006.01)

Patent

CA 2092882

ABSTRACT OF THE DISCLOSURE In a circuit arrangement having a switching amplifier (10), particularly for hearing aids, for limiting a pulse-width-modulated signal (S3) that is formed for a low-frequency signal (S1) and a higher-frequency delta signal (S2), a limitation of the output signal from the switching amplifier is achieved without a reduction in gain given only slight distortions. To that end, the pulse- width-modulated signal (S3) is supplied to a circuit (5; 14; 18) which modifies the width (D1, D2, D4) of individual pulses in the pulse-width-modulated signal (S3), whose width (D1, D2, D4) is longer or/and shorter than a maximum or minimum pulse width (D3; D5) prescribable by the circuit (5; 14; 18). The pulse-width- modulated signal (S5; S6) modified by the circuit (5; 14; 18) can be supplied to the switching amplifier (10) as an input signal.

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