Integrated PULSHI mode with shutdown

Details Integrated PULSHI mode with shutdown Integrated PULSHI mode with shutdown

2006-07-18

2006-07-18

Smith, Zandra V. (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

Reexamination Certificate

active

07078963

ABSTRACT:
Systems and methods for controlling amplification of a pair of pulse width modulated signals. In one embodiment, a system comprises an audio amplifier which is configured to receive a pulse code modulated (PCM) input signal, convert this signal to a pulse width modulated (PWM) signal in a controller, and amplify the PWM signal in an output stage. The controller separates the PWM signal into a high-side signal and a low-side signal. The controller incorporates digitally programmable delays into the processing paths for each of the high-side and low-side signals. The high-side and low-side signals are separately provided to the output stage. The separate high-side and low-side signals can be used to individually control (e.g., turn off) the high-side and low-side transistors. Circuitry is included to generate a short low-side pulse when both transistors are turned off in order to drain the gate charge from the high-side transistor.

REFERENCES:
patent: 5118997 (1992-06-01), El-Hamamsy
patent: 6064259 (2000-05-01), Takita
patent: 6294954 (2001-09-01), Melanson
patent: 2004/0036533 (2004-02-01), Mazda

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