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This paper presents a Class-D stage with 3rd harmonic suppression operating at 2VDD(i.e., twice the nominal supply voltage). A DLL-based phase generator is used to generate the phases of the driving signals and by modifying the driver stage 5th harmonic suppression is also possible. The output stage and drivers are based on inverters only, where the short-circuit current is eliminated in the output...
This paper presents the design and analysis of a low-power Class-D stage in 90 nm CMOS featuring a harmonic suppression technique, which cancels the 3rd harmonic by shaping the output voltage waveform. Only digital circuits are used and the short-circuit current present in Class-D inverter-based output stages is eliminated, relaxing the buffer requirements. Using buffers with reduced drive strength...
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