Circuit arrangement having a switching amplifier

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

1993-03-11

1995-01-03

Sikes, William L.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

327173, 327174, 327309, H03K 400, H03K 600, H03K 1200

Patent

active

053789334

ABSTRACT:
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.

REFERENCES:
patent: 3568094 (1971-03-01), Metzger
patent: 4439738 (1984-03-01), Atherton
patent: 4549151 (1985-10-01), Kaneko
patent: 4592087 (1986-05-01), Killion
patent: 4689819 (1987-08-01), Killion
patent: 4903302 (1990-02-01), Graclotti et al.
patent: 5220203 (1993-06-01), McMorrow, Jr. et al.

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