Gate control circuit with soft start/stop function

Details Gate control circuit with soft start/stop function Gate control circuit with soft start/stop function

2006-02-14

2006-02-14

Shingleton, Michael B (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S20700P, C330S251000, C381S094500, C375S238000, C327S126000

Reexamination Certificate

active

06998911

ABSTRACT:
A control terminal driver circuit for a switching amplifier including a driver for each of a pair of output power transistors responsive to a PWM information signal. The circuit operates in response to an operating state signal indicating a start up condition for the amplifier to vary the amplitude of the drive pulses for the output transistors between a zero value and a maximum value for normal operation of the amplifier over a start up interval, and to reverse the process during a shut down interval. A DC offset detector is provided to detect a DC offset at amplifier output, and an error circuit responsive to an output of the DC offset detector controls the relative amplitude of the driver outputs during at least a portion of the start up interval to substantially eliminate the DC offset. Also disclosed is a switching amplifier including a control terminal driver circuit as described above.

REFERENCES:
patent: 4390849 (1983-06-01), Miskin
patent: 6384678 (2002-05-01), Berkhout
patent: 6388514 (2002-05-01), King et al.
patent: 2005/0151585 (2005-07-01), Honda et al.

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