Digital pulse width modulation for half bridge amplifiers

Details Digital pulse width modulation for half bridge amplifiers Digital pulse width modulation for half bridge amplifiers

2008-10-30

2010-11-02

Pascal, Robert (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

Reexamination Certificate

active

07825726

ABSTRACT:
A switching amplifier drives a load or audio transducer. A digital integral noise shaping circuit converts a digital input such as audio content to an output digital pulse width modulated signal using an integrator. The integrator integrates the digital input, a variable frequency reference pulse width modulated signal and an inverse of the output digital pulse width modulated signal. A half bridge amplifier receives the output digital pulse width modulated signal and drives the load or audio transducer. A variable frequency generator generates the variable frequency reference pulse width modulated signal with an approximately equal duty ratio or alternatively varies the variable frequency pulse width modulated signal above and below about a fifty percent duty ratio.

REFERENCES:
patent: 6819912 (2004-11-01), Roeckner et al.
patent: 7130346 (2006-10-01), Midya et al.
patent: 7355472 (2008-04-01), Kranz
patent: 7579910 (2009-08-01), Zhang et al.
patent: 2008/0252392 (2008-10-01), Midya et al.

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