Title:
シグマデルタ変調器
Document Type and Number:
Japanese Patent JP2009540716
Kind Code:
A
Abstract:
A sigma-delta modulator for forming a digital output signal representative of the magnitude of an analog input signal, the modulator comprising a modulation unit comprising: a summation unit for summing the analog input signal with an adjustment signal to form a summation output signal; an integrator arranged to receive the summation output signal and form an integrator output signal dependent thereon; and a quantizer arranged to receive the integrator output signal and form the digital output signal dependent thereon; the sigma-delta modulator further comprising a feedback loop for generating the adjustment signal and comprising a selection circuit arranged to form the adjustment signal by selecting between one of two boundary values for the adjustment signal, the selection being performed in dependence on the digital output signal.
Inventors:
Colmar Morgan James
Application Number:
JP2009514887A
Publication Date:
November 19, 2009
Filing Date:
June 11, 2007
Export Citation:
Assignee:
GS IP LIMITED LIABILITY COMPANY
International Classes:
H03M3/02
Domestic Patent References:
| JP2001237706A | 2001-08-31 | |||
| JPH08307275A | 1996-11-22 | |||
| JPH11145829A | 1999-05-28 |
Foreign References:
| US6252536B1 | 2001-06-26 | |||
| US5187482A | 1993-02-16 | |||
| GB2409118A | 2005-06-15 |
Attorney, Agent or Firm:
Shuji Sugimoto
Masashi Noda
Kenro Tsutsumi
Kumiko Hayashida
Masashi Noda
Kenro Tsutsumi
Kumiko Hayashida