公开(公告)号：EP1834407A1

公开(公告)日：2007-09-19

申请号：EP05820670.7

申请日：2005-12-14

Applicant: University of Westminster

Inventor： KALE, Izzet ,  MORLING, Richard Charles Spicer ,  ZARE-HOSEINI, Hashem

IPC: H03M3/00 ,  H03M1/08

CPC classification number: H03M3/372 ,  H03M3/464 ,  H03M3/502

Abstract: A method of Digital to Analogue conversion of an input signal Do for suppressing the effect of clock-jitter in a Delta-Sigma analogue to digital converter, or class D amplifier, comprises charging a capacitor (414) to a reference voltage value (Vref) during a first phase (φi) of a clock signal, discharging the capacitor during a second phase (φ2) of the clock signal, wherein the discharge is regulated by a biased transistor (418, 419), responsive to the voltage on the capacitor, in a first part of the second phase to provide an approximately constant discharge current, and regulated in a second part of the second phase for rapidly discharging the capacitance means before the end of the second phase; and providing an output (Ud, OUT) as a function of the discharge current and the input signal Do The output signal Ud, may be applied as a feedback signal to a loop filter in a Delta-Sigma converter Alternatively the output may represent the output of a Class D amplifier.

公开(公告)号：EP1834407B1

公开(公告)日：2010-03-24

申请号：EP05820670.7

申请日：2005-12-14

Applicant: University of Westminster

Inventor： KALE, Izzet ,  MORLING, Richard Charles Spicer ,  ZARE-HOSEINI, Hashem

IPC: H03M3/00 ,  H03M1/08

CPC classification number: H03M3/372 ,  H03M3/464 ,  H03M3/502

公开(公告)号：EP1987646A1

公开(公告)日：2008-11-05

申请号：EP07705200.9

申请日：2007-02-14

Applicant: University of Westminster

Inventor： KALE, Izzet ,  MORLING, Richard, Charles, Spicer ,  CETIN, Ediz ,  DEMPSTER, Andrew, Graham

IPC: H04L27/38 ,  G01S1/00

CPC classification number: H04L27/3863 ,  G01S5/0221 ,  G01S19/24

Abstract: In a satellite radio navigation receiver receiving a transmitted radio navigation signal, a method of removing I/Q-mismatches in the received signal, comprising: resolving the received signal into I and Q signal component, and providing them as inputs to a demixing stage which removes unwanted signals, the demixing stage including first and second cross-coupled adaptive filters, whose coefficients are updated by the outputs of the demixing stage, the outputs of the demixing stage representing an IQ mismatch corrected signal. The receiver may be a,zero-IF or low-IF receiver, and may operate on time domain or frequency domain signals.