| Autor: |
S. Azrouf, M. Bellanger, Frederic Gourgue, V. Bruneau |
| Rok vydání: |
2002 |
| Předmět: |
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| Zdroj: |
ISCAS |
| Popis: |
Radio receivers for digital cellular systems must respect tight constraints in terms of selectivity and dynamic range. Delta-sigma analog-to-digital converters offer a response to the last problem thanks to their high resolution. On the other hand, selectivity is often achieved by filtering the received signal at an intermediate frequency (IF). Limitations of A/D converters impose usually an extra IF conversion of the signal to a lower frequency before being able to properly digitize it. We propose a new delta-sigma converter operating directly on the IF signal allowing the design of simple receivers offering both a high resolution and a good selectivity. Undersampling the IF signal allows reduction of the load of the digital section of the receiver. > |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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