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Journal Article
Compensation Technique for Time Alignment of Envelope and Phase Paths in an Envelope Delta-sigma Modulator
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- Authors
- Sung Jun Lee, Young-Kyun Cho, Jae Ho Jung
- Issue Date
- 2015-06
- Citation
- IEICE Electronics Express, v.12, no.13, pp.1-6
- ISSN
- 1349-2543
- Publisher
- IEICE
- Language
- English
- Type
- Journal Article
- Abstract
- A compensation technique for time alignment of envelope and phase paths in an envelope delta-sigma modulator (EDSM) is proposed. In this technique, two controllable delays are intentionally added, and a combination of the two delays compensates a time misalignment caused by the inherent processing delay of a delta-sigma modulator (DSM) and the difference of propagation delays on the asymmetric envelope and phase paths. One of the two delays is a digital sample delay, which is added in the digital domain before a digital-to-analog converter (DAC). The other delay is obtained by the use of D flip flops (DFFs) followed by a DSM, which is possible because the output of a DSM is changed by a clock. The validity of the proposed technique is confirmed by simulation.
- KSP Keywords
- Delta-Sigma Modulator, Digital to Analog Converter, Flip-flop, Processing Delay, Propagation delay, Sample Delay, Time Misalignment, compensation technique, digital domain, digital-to-analog(DAC), time alignment