EP 1590885 A1 20051102 - MULTI-MODE MODULATOR AND TRANSMITTER
Title (en)
MULTI-MODE MODULATOR AND TRANSMITTER
Title (de)
MEHRFACHMODUS-MODULATOR UND SENDER
Title (fr)
MODULATEUR MILTIMODES ET EMETTEUR
Publication
Application
Priority
- CA 2004000014 W 20040106
- CA 2415668 A 20030106
- US 43820203 P 20030106
Abstract (en)
[origin: WO2004062087A1] The present invention relates generally to communications, and more specifically to a method and apparatus of modulating baseband and RF (radio frequency) signals. A modulator topology is disclosed in which an input signal x(t) is up-converted to an output signal y(t), either by mixing it with two mixing signals phi1 and phi2 ("pseudo-direct conversion" mode), or by mixing it with only one mixing signal phi2 ("direct-conversion" mode). In pseudo-direct modulation mode, the phi1 and phi2 mixing signals emulate a local oscillator signal; the product phi1* phi2 has significant power at the frequency of a local oscillator signal being emulated, but neither phi1 nor phi2 have significant power at the frequency of the input signal x(t), the LO signal being emulated, or the output signal phi1 phi2 x(t).
IPC 1-7
IPC 8 full level
CPC (source: EP KR)
H03D 7/16 (2013.01 - KR); H03D 7/163 (2013.01 - EP); H04B 1/04 (2013.01 - KR); H04B 1/0475 (2013.01 - EP); H04B 2001/0491 (2013.01 - EP)
Citation (search report)
See references of WO 2004062087A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2004062087 A1 20040722; EP 1590885 A1 20051102; JP 2006515498 A 20060525; KR 20050088491 A 20050906
DOCDB simple family (application)
CA 2004000014 W 20040106; EP 04700246 A 20040106; JP 2006500427 A 20040106; KR 20057012678 A 20050706