Title:
直交装置におけるミスマッチの補償
Document Type and Number:
Japanese Patent JP4817092
Kind Code:
B2
Abstract:
A quadrature device 1 for a communication device, receiver, transmitter, transceiver, telephone, mixer, modulator or demodulator comprises I and Q signal paths and corresponding signal paths components 2 I, 2 Q; 4 I, 4 Q; 9 I, 9 Q showing a mismatch. The device 1 comprises switching circuitry 3, 3', 6, 3'', 3 ''' for data dependently exchanging the I and Q signals in the I and Q paths in order to improve adverse effects, such as reduction of leakage of quantisation noise from the image band to the signal band in a quadrature modulator. Even mismatch effects between digital to analog converters (DAC's) in a feedback path of a sigma delta (SigmaDelta) modulator are compensated.
Inventors:
Blames, lucine ye
Daikansu, Eisese
Van der Zuan, Erik Ye
Daikansu, Eisese
Van der Zuan, Erik Ye
Application Number:
JP2001567202A
Publication Date:
November 16, 2011
Filing Date:
March 05, 2001
Export Citation:
Assignee:
Estee-Ericsson, Society, Anonymous
International Classes:
H04L27/20; H04L27/36; H03D3/00; H03D7/16; H03M3/02; H03M3/04; H04L27/00
Domestic Patent References:
| JPH09247226A | 1997-09-19 | |||
| JPH11340860A | 1999-12-10 | |||
| JPH10242863A | 1998-09-11 | |||
| JPH10257113A | 1998-09-25 | |||
| JPS62159518A | 1987-07-15 | |||
| JPH10501673A | 1998-02-10 |
Attorney, Agent or Firm:
Hirohito Katsunuma