Output stage circuit

Details Output stage circuit Output stage circuit

2009-03-19

2010-10-19

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including class d amplifier

C330S20700P, C330S010000

Reexamination Certificate

active

07816986

ABSTRACT:
A PWM signal drives a pair of output transistors connected in series between a supply line and ground so that a push-pull current is output toward a speaker via a coil from a point connecting both output transistors. A current limiting resistor has one end connected to the supply line and between the other end and ground is provided a control transistor. Furthermore, a comparator compares the supply line voltage and a reference voltage and turns on the control transistor when the supply line voltage is higher than the reference voltage in the comparison result thereof.

REFERENCES:
patent: 5216376 (1993-06-01), Swanson
patent: 5805020 (1998-09-01), Danz et al.
patent: 6597240 (2003-07-01), Walburger et al.
patent: 7076070 (2006-07-01), Pearce et al.
patent: 7671675 (2010-03-01), Miyashita et al.
patent: 2006/0280314 (2006-12-01), Okada et al.
patent: 2006-333437 (2006-12-01), None

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