A Novel Bit-Serial Design of Comb Filters for Oversampling A/D Converters

نویسندگان

  • Nianxiong Tan
  • Sven Eriksson
  • Lars Wanhammar
چکیده

The non-recursive algorithm of comb filters suitable for bitserial implementation is described in this paper. It performs decimation on the oversampling delta-sigma modulator output in several stages by utilizing the commutative rule. Each stage performs very simple FIR filtering and decimates the output by a factor of 2. A novel bit-serial design based on this algorithm is then presented. It features regularity and area and power-consumption efficiency. It also provides the possibility of higher frequency operation than existing designs. As an example, a comb filter of the response sinc3(f) with a decimation ratio 32 has been designed in AMS' 1 μm double-metal CMOS process. It contains only 4500 transistors even by using standard static gates and occupies about 1.1 mm2 active chip area.

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تاریخ انتشار 1994