Title:
直角位相信号変換装置
Document Type and Number:
Japanese Patent JP4148992
Kind Code:
B2
Abstract:
A receiver including two sigma delta modulators used to convert a pair of analog quadrature signals into digital quadrature signals. In such sigma delta modulators the quantization noise is shifted into a frequency region in which no signal is present. A cross coupling between the filters is provided to improve the noise reduction without increasing the order of the filters. By providing the cross coupling, it is possible to obtain complex poles and zeros in the noise transfer function which do not have to appear in complex conjugate pairs which results in an increase of the noise suppression in a specified frequency range.
Inventors:
Stikfurt, Edoard Ferdinand
Application Number:
JP53014096A
Publication Date:
September 10, 2008
Filing Date:
March 18, 1996
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
H03C3/00; H03C3/40; H03D3/00; H03M3/02; H04B1/26; H04L27/00; H04L27/233
Domestic Patent References:
| JP4233358A | ||||
| JP226406A | ||||
| JP220933A |
Foreign References:
| GB2233518A | ||||
| WO1994010779A1 |
Attorney, Agent or Firm:
Kenji Yoshitake
Hidetoshi Tachibana
Takeshi Sekine
Takahashi
Tadahiko Ito
Hidetoshi Tachibana
Takeshi Sekine
Takahashi
Tadahiko Ito