Systems and methods for maintaining minimum pulse width...

Details Systems and methods for maintaining minimum pulse width... Systems and methods for maintaining minimum pulse width...

2007-03-16

2008-10-14

Choe, Henry K (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S251000

Reexamination Certificate

active

07436256

ABSTRACT:
Systems and methods for preventing violations of minimum pulse width requirements that may cause damage to PWM amplifiers. One embodiment comprises a digital PWM amplifier that includes shutdown circuitry which is configured to identify blockout intervals during which deassertion of the PWM signals would cause the generation of below-minimum-width pulses in the signals. Each blockout interval may, for example, begin 1 minimum pulse width before and end 1 minimum pulse width after a rising/falling edge the PWM signals. If a shutdown signal is asserted (or deasserted) during one of the blockout intervals, the PWM signals are deasserted (or reasserted) at the end of the blockout interval.

REFERENCES:
patent: 4716274 (1987-12-01), Gilliland
patent: 6696891 (2004-02-01), Noro et al.
patent: 6734725 (2004-05-01), Masuda et al.

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