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Downconverting SIGMA-Delta A/D Converter for a Reconfigurable RF Receiver.

Downconverting SIGMA-Delta A/D Converter for a Reconfigurable RF Receiver.


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About the Book

The proliferation of a multitude of wireless standards as well as the interest in cognitive radios have resulted in the need for a highly reconfigurable radio-frequency (RF) receivers. Reconfigurability in an RF receiver has to be obtained with a negligible degradation in circuit performance, power consumption and silicon area. Digital signal processing offers a degree of flexibility that is perhaps unmatched by analog circuitries. Nevertheless, a strategy of processing an RF signal entirely in the digital domain would place an incredible burden in the analog-to-digital converter circuits. A novel receiver architecture is proposed in this work, where a high performance analog-to-digital converter is tightly integrated within the RF circuit. In the proposed architecture, a signal at a radio frequency is directly converted to digital domain using a down-converting sigma-delta (SigmaDelta) modulator. A SigmaDelta A/D converter is well-suited for an RF receiver. First, it minimizes aliasing due to the high sampling-rate. Second, it enables high-resolution conversion of the desired signal with low-resolution components. A direct-conversion to DC architecture greatly simplifies frequency planning of this flexible receiver, as it eliminates problems related to image frequency bands. A circuit prototype demonstrating the proposed concept has been designed, fabricated and measured. The test-chip prototype is able to maintain an SNR of greater than +59dB across a 4-MHz bandwidth with a programmable center frequency of 400MHz to 1.7GHz. As illustrated in this work, the tight integration of the SigmaDelta modulator within the RF receiver also enables the receiver to achieve a very good linearity. An IIP3 of +19dBm and an out-of-band 3-dB desensitization level of +6dBm is measured in this test-chip prototype.


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Product Details
  • ISBN-13: 9781243667526
  • Publisher: Proquest, Umi Dissertation Publishing
  • Publisher Imprint: Proquest, Umi Dissertation Publishing
  • Height: 246 mm
  • Weight: 299 gr
  • ISBN-10: 1243667524
  • Publisher Date: 01 Sep 2011
  • Binding: Paperback
  • Spine Width: 9 mm
  • Width: 189 mm


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Downconverting SIGMA-Delta A/D Converter for a Reconfigurable RF Receiver.
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