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Details for:
Pandita B. Oversampling AD Converters...Transfer Functions 2011
pandita b oversampling ad converters transfer functions 2011
Type:
E-books
Files:
1
Size:
10.9 MB
Uploaded On:
Oct. 16, 2022, 1:28 p.m.
Added By:
andryold1
Seeders:
2
Leechers:
0
Info Hash:
BDE04738ECCB1D6FB973B260024B1226CCD18682
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Textbook in PDF format This book proposes a low-IF receiver architecture suitable for the realization of single-chip receivers. To alleviate the image-rejection requirements of the frontend filters an oversampling complex discrete-time DS ADC with a signal-transfer function that achieves a significant filtering of interfering signals is proposed. A filtering ADC reduces the complexity of the receiver by minimizing the requirements of analog filters in the IF digitization path. Discrete-time DS ADCs have precise resonant frequency and clock frequency ratios and, hence, do not require the calibration or tuning that is necessary in the case of continuous-time DS modulator implementations. This feature makes the proposed discrete-time DS ADC ideal for multistandard receiver applications. The DS modulator signal-transfer function (STF) and noise-transfer function (NTF) have been designed using complex filter routines based on classical filter design procedures. With a filtering STF and stop band attenuation greater than 30 dB, the DS modulator reduces intermodulation of the desired signal and the interfering signals at the input of the quantizer, and also avoids feedback of the high-frequency interfering signals at the input of the modulator. The reported complex DS ADC is intended for DTV receiver applications. With a maximum intended sampling frequency of 128 MHz and an OSR of 16, the ADC has been designed to support a maximum DTV signal bandwidth of 8 MHz. Except for a somewhat reduced maximum sampling frequency, the test results of the prototype complex DS modulator are very close to the simulated results. The IC achieved 70.9 dB SNDR over a 6 MHz band centered around 3 MHz. The image rejection ratio (IRR) of the DS ADC was measured to be greater than 65 dB. The measurement results confirm the filtering characteristics of the ADC. The fabricated chip consumes 177 mW and occupies a silicon area of 2.15 mm2
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Pandita B. Oversampling AD Converters...Transfer Functions 2011.pdf
10.9 MB