Silent start

Details Silent start Silent start

2001-05-24

2002-05-07

Pascal, Robert (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S20700P

Reexamination Certificate

active

06384678

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to a push-pull amplifier as described in the preamble of claim
1
.
From the U.S. Pat. No. 5,805,020 a silent start Class D amplifier is known wherein start-up noise is corrected by adding an analog switch to the integrator circuit. In an alternate embodiment a silent start switch connects a variable resistance to a comparator input. The resistance gradually increases to overcome start-up noise.
A disadvantage of this known silent start Class D amplifier is that activating the switching unit is done at a completely arbitrary moment.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a push-pull amplifier and a silent start circuit, which do not have the disadvantages of the known amplifier and silent start circuit. To this end, a push-pull amplifier comprises the features of claim
1
. The invention provides the possibility to firstly bring the loop approximately at the required level and secondly to wait with the switching on moment till the moment at which the start up noise is as small as possible.
Embodiments of the invention are described in the dependent claims.
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. No. ID603908, application Ser. No. 0,201,818.2
“Level shifter” applicant's ref. No. ID604680, application Ser. No. 0,201,826.5
“PWM limiter” applicant's ref. No. ID604682, application Ser. No. 0,201,828.1
“Demodulation filter” applicant's ref. No. ID604683, application Ser. No. 0,201,829.9.


REFERENCES:
patent: 5160896 (1992-11-01), McCorkle
patent: 5596648 (1997-01-01), Fast
patent: 5805020 (1998-09-01), Danz et al.
patent: 6300825 (2001-10-01), Dijkmans et al.
patent: 0817371 (1998-01-01), None

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