Title:
&Dgr Σ MODULATOR AND &Dgr Σ ANALOG/DIGITAL CONVERTING CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2006/085605
Kind Code:
A1
Abstract:
A &Dgr Σ modulator of frequency modulation system wherein the requirement of linearity for an oscillator is lessened. The &Dgr Σ modulator comprises an oscillating apparatus the frequency of which varies in accordance with an input signal; a quantizing means (16) for quantizing the frequency modulation signal from the oscillating apparatus into a binary signal; and an arithmetic circuit (18,20) for operating the digital signal from the quantizing means (16). The oscillating apparatus has an oscillator (10) the frequency of which varies in accordance with an input signal; a reference signal source (11) for providing a reference signal having a predetermined frequency; a mixer (12) for receiving the signals from the oscillator (10) and from the reference signal source (11); and a lowpass filter (14) for passing the low frequency components of signals from the mixer (12). The center oscillation frequency of the oscillator (10) is established such that it is higher than the center oscillation frequency of a target signal.
Inventors:
MAEZAWA KOICHI (JP)
MIZUTANI TAKASHI (JP)
MIZUTANI TAKASHI (JP)
Application Number:
PCT/JP2006/302334
Publication Date:
August 17, 2006
Filing Date:
February 10, 2006
Export Citation:
Assignee:
UNIV NAGOYA NAT UNIV CORP (JP)
MAEZAWA KOICHI (JP)
MIZUTANI TAKASHI (JP)
MAEZAWA KOICHI (JP)
MIZUTANI TAKASHI (JP)
International Classes:
H03M3/02
Foreign References:
| JPH1141171A | 1999-02-12 | |||
| JPH04346521A | 1992-12-02 | |||
| JP2002261615A | 2002-09-13 |
Other References:
HOVIN M. AND OLSEN A.: "Delta-Sigma Modultors Using Frequency-Modulated Intermediate Values", IEEE JOURNAL OF SOLD-STATE CIRCUITS, vol. 32, no. 1, 1997, pages 13 - 22, XP003001168
SAKO M. ET AL.: "Kyomei Tunnel Shoshi to MOSFET o Mochiita deltasigmaADC no Kosei", 2004 IEICE ELECTRONICS SOCIETY TAIKAI KOEN RONBUNSHU 2, 8 September 2004 (2004-09-08), pages 50, XP003001963
SAKO M. ET AL.: "Kyomei Tunnel Shoshi to MOSFET o Mochiita deltasigmaADC no Kosei", 2004 IEICE ELECTRONICS SOCIETY TAIKAI KOEN RONBUNSHU 2, 8 September 2004 (2004-09-08), pages 50, XP003001963
Attorney, Agent or Firm:
Kai-u, Patent Law Firm (45-14 Meieki 2-chome, Nakamura-ku, Nagoya-sh, Aichi 02, JP)
Download PDF: