EP 1209756 B1 20071114 - A radio frequency amplifying circuit
Title (en)
A radio frequency amplifying circuit
Title (de)
Radiofrequenz-Verstärkerschaltung
Title (fr)
Circuit amplificateur de fréquence radio
Publication
Application
Priority
EP 00610120 A 20001128
Abstract (en)
[origin: EP1209756A1] A hybrid coupler (66, 67; 72, 73) has four ports and is capable of coupling radio frequency signals having a certain frequency from at least one port to at least one other port. The hybrid coupler (66, 67; 72, 73) is implemented as a differential coupler arranged to couple differential radio frequency signals. With such a hybrid coupler a power amplifying circuit can be produced which has sufficiently low ripple on the supply voltage to be integrated together with more sensitive radio circuits, and which is also insensitive to load mismatch such that an isolator can be avoided. A differential hybrid coupler allows the output current to be shared between four transistors or amplifiers, thus reducing the amplitude of the ripple. Further, the frequency of the ripple is four times the operating frequency of the circuit, which makes it much easier to filter out the ripple. <IMAGE>
IPC 8 full level
H01P 5/16 (2006.01)
CPC (source: EP)
H01P 5/16 (2013.01)
Citation (examination)
TAKAGI T; SEINO K; IKEDA Y; ISHIHARA O; TAKEDA F: "A 1.5 watt 28 GHz band FET amplifier", IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST. EXPANDING MICROWAVE HORIZONS, 1 June 1984 (1984-06-01), New York, NY, USA, pages 227 - 228, XP009071787
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
EP 1209756 A1 20020529; EP 1209756 B1 20071114; AT E378699 T1 20071115; DE 60037125 D1 20071227; DE 60037125 T2 20080911; ES 2293890 T3 20080401
DOCDB simple family (application)
EP 00610120 A 20001128; AT 00610120 T 20001128; DE 60037125 T 20001128; ES 00610120 T 20001128