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Abstract

A Class D amplifier includes a ramp generator that generates a ramp signal and an inverted ramp signal. A signal generator generates first, second, third and fourth signals by comparing the ramp and inverted ramp signals to an input signal. A frequency of the ramp signal is approximately two orders of magnitude higher than a frequency of the input signal. The signal generator transitions from a first state to a second state of a first control signal after one of the first and second signals occurs, transitions from a first state to a second state of a second control signal after one of the third and fourth signals occurs, and transitions from the second state to the first state of one of the first and second control signals when the other of the first and second control signals transitions to the second state. An output stage includes first and second switches that are controlled based on the first and second control signals, respectively, and generates output current based on the first and second control signals.

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First Claim