The apparatus of claim 2, wherein the first and second bias signals are identical.ĥ. The apparatus of claim 2, wherein the first and second bias signals are arithmetic complements of equal magnitude.Ĥ. The apparatus of claim 1 further comprising: a first summer to sum a first bias signal and the digital input signal and to provide the sum to the first digital signal modulator and a second summer to sum a second bias signal and the digital input signal and to provide the sum to the second digital signal modulator.ģ.
An apparatus, comprising: a first digital signal modulator to generate a first output signal derived from a digital input signal a second digital signal modulator to generate a second output signal derived from the digital input signal and wherein, during operation of the first and second digital signal modulators, the first output signal has a direct relationship to change in the digital input signal, the second output signal has an inverse relationship to change in the digital input signal, and the first and second output signals are suitable for driving an opposed current converter stage.Ģ. For example, noise shaping may be implemented using delta-sigma modulators as one stage in digital signal modulators.ġ. Additionally, by utilizing digital signal processing to modulate the input signal, various processing technologies are applied to the input signal. By adjusting the phase relationships between the clock frequencies, various output signal characteristics are achieved. The corresponding output signals are utilized to drive a load, such as a half bridge, opposed current amplifier and to produce a single output signal. In one embodiment, a digital input signal, which may be biased, is modulated by multiple digital signal modulators to generate corresponding output signals. The combinations of frequency relationships and digital signal modulator elements provide significant digital signal processing capabilities and flexible output signal timing. A digital input signal is modulated using multiple digital signal modulators operating at a variety of clock frequencies and clock frequency phase relationships to drive a load, such as an opposed current amplifier or other opposed current converter.
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