PWM limiter

Details PWM limiter PWM limiter

2001-05-24

2003-06-10

Pascal, Robert (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S20700P, C330S251000

Reexamination Certificate

active

06577186

ABSTRACT:

TECHNICAL FIELD
The invention relates to a push-pull amplifier as described in the preamble of claim
1
.
The invention further relates to a pulse width modulator for use in such a push-pull amplifier.
BACKGROUND AND SUMMARY OF THE INVENTION
From an application note of National Semiconductor Corporation DS 101277 such a Class D amplifier is known. Herein a limiter is described to prevent one of the switches to remain active over an extended period of time.
A disadvantage of such a push-pull amplifier and of such a pulse width modulator is that the clip behaviour of this known push-pull amplifier is that the spectrum of the output signal is not predictable.
It is an object of the invention to provide a push-pull amplifier not having the disadvantage of the prior art. It is a further object of the invention to improve the push-pull amplifier further. To this end a push-pull amplifier according to the invention comprises the features of claim 1.
Herewith a cross-reference is made to the following co-pending applications of the same applicant and of the same date:
“Carrousel handshake” applicant's ref. Nr. ID603908, Application No. 0 201 818.2
“Level shifter” applicant's ref. Nr. ID60468, Application No. 0 201 826.5
“Silent start” applicant's ref. Nr. ID604681, Application No. 0 201 827.3
“Demodulation filter” applicant's ref. Nr. ID604683, Application No. 0 201 829.9.
Embodiments of the invention are described in the dependent claims.


REFERENCES:
patent: 5389829 (1995-02-01), Milazzo
patent: 5777512 (1998-07-01), Tripathi et al.
patent: 5974089 (1999-10-01), Tripathi et al.
patent: 6300825 (2001-10-01), Dijkmans et al.
patent: 9938255 (1999-07-01), None

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