Abstract:
A digital bandpass delta-sigma modulator for class-S power amplifiers is presented. In comparison to a 2-level modulator coding efficiency can be increased by 10% over a ...View moreMetadata
Abstract:
A digital bandpass delta-sigma modulator for class-S power amplifiers is presented. In comparison to a 2-level modulator coding efficiency can be increased by 10% over a large input power range with a 3-level modulator. Scaling the quantizer thresholds offers a trade-off between coding efficiency and signal-to-noise ratio. The bandpass modulator architecture allows twofold interleaving. A constraint on the quantizer thresholds and the feedback values reduces the effective operand word width in the feedback loop to the 5 most significant bits. Pipelining of the less significant bits leads to a short critical path. Interleaving and pipelining promise fast operation and thus a high maximum signal frequency.
Date of Conference: 15-18 May 2011
Date Added to IEEE Xplore: 04 July 2011
ISBN Information: