求IEICE Paper: Bit-Stream Signal Processing Circuits and Their Application

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Bit-Stream Signal Processing Circuits and Their Application Hisato FUJISAKA [url=http://search.ieice.org/bin/author.php?a_name=Masahiro%20SAKAMOTO&category=A&lang=E&year=2002&abst=]Masahiro SAKAMOTO Mititada MORISUE Publication IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences  Vol.E85-A   No.4   pp.853-860 Publication Date: 2002/04/01 Online ISSN: Print ISSN: 0916-8508 Type of Manuscript: PAPER Category: Digital Signal Processing Keyword: sigma-delta modulation, bit-stream signal, digital signal processing, arithmetic circuit, Full Text: PDF(1MB) Summary: A digital circuit technique is proposed to process directly bit-stream signals from Analog-to-digital converters based on sigma-delta modulation. Newly developed adder and multiplier are fundamental circuit modules for the processing. Using the fundamental modules and up/down counters, other circuit modules such as divider and square root circuits are also realized. The signal processors built of the modules have advantages over multi-bit Nyquist rate processors in circuit scale by the following two distinct features: First, single-bit/multi-bit converters are not needed at the inputs of the processors because the arithmetic modules directly process bit-stream signals. Secondly, the arithmetic modules consist of small number of logic gates. As an application of the technique to digital signal processing for communications, a QPSK demodulator is presented. The demodulator is structured with 40% of logic gates consumed by an equivalent multi-bit demodulator.

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