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IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 2008 E91-A(2):443-453; doi:10.1093/ietfec/e91-a.2.443
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Special Section on Analog Circuit Techniques and Related Topics -- Papers

Input-Feedforward Two-Path Band-Pass Delta-Sigma Modulator Based on Horizontal or Vertical Opamp Sharing Technique

Naoya WAKI1, Hiroki SATO1, Akira HYOGO1 and Keitaro SEKINE1

1 The authors are with Tokyo University of Science, Noda-shi, 278-8510 Japan. E-mail: waki{at}vlsi.ee.noda.tus.ac.jp


  Abstract

In this paper, horizontal (where an opamp is shared in two adjacent stages) and vertical (where an opamp is shared across two paths) opamp sharing techniques for a two-path band-pass (BP) {Delta} {Sigma} modulator are described, and input-feedforward two-path fourth-order BP {Delta} {Sigma} modulators that have only two opamps are proposed. The proposed modulators are based on the horizontal or vertical opamp sharing technique. They can be realized with both a summation circuit using a switched capacitor (SC) network and a second-order high-pass filter (HPF) with a horizontal shared opamp or a double-sampling first-order HPF with a vertical shared opamp, which are based on an SC first-order HPF with an opamp. These techniques can reduce the number of opamps with no additional component and the chip area as well as realize lower power consumption.

Key Words: band-pass delta-sigma, two-path, opamp sharing, high-pass filter

Manuscript received June 16, 2007. Manuscript revised September 14, 2007.


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