Minimum pulse generation in a class-D amplifier

Details Minimum pulse generation in a class-D amplifier Minimum pulse generation in a class-D amplifier

2011-05-17

2011-05-17

Pascal, Robert (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S20700P

Reexamination Certificate

active

07944289

ABSTRACT:
For minimum pulse generation in a class-D amplifier, a trapezoid switching waveform shape is used to replace the tradition triangle type to generate PWM pulses. Two voltages are compared with a sawtooth wave signal to generate the trapezoid waveform signal and a constant pulse width signal. An audio input signal is compared with the trapezoid waveform signal to generate a pulse width modulation signal, and either the pulse width modulation signal or the constant pulse width signal is used for driving a load at an output of the class-D amplifier. Flexible minimum pulse width could be obtained by offsetting one of the two voltages in generation of the constant pulse width signal.

REFERENCES:
patent: 7482870 (2009-01-01), Maejima et al.

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