Title :
Noise and power optimization of a MMIC quasi-circulator
Author :
Gasmi, Ahmed ; Huyart, Bernard ; Bergeault, Eric ; Jallet, Louis
Author_Institution :
Dept. of Commun., ENST, Paris, France
fDate :
9/1/1997 12:00:00 AM
Abstract :
This paper first sums up the power and noise limits of various types of active circulators and quasi-circulators. It then presents the design and measured performances of a narrow-band quasi-circulator module tailored for use in a transmit/receive (T/R) module. Its design implements an active power divider and a combiner, a method to calculate the minimum noise figure is presented for this circuit. At 4 GHz, the device demonstrates a noise figure of 5.5 dB and an output power of 18 dBm with associated gains of 4 and 7.6 dB for the receive and transmit path, respectively. The third-order intercept point (IP3) is equal to 25.6 dBm for the transmit path
Keywords :
MESFET integrated circuits; circuit optimisation; field effect MMIC; integrated circuit layout; integrated circuit noise; microwave circulators; power combiners; power dividers; 4 GHz; 4 dB; 5.5 dB; 7.6 dB; MESFET IC; MMIC quasi-circulator; SHF; T/R module application; active power combiner; active power divider; minimum noise figure; narrowband quasi-circulator module; noise optimization; power optimization; transmit/receive module; Active noise reduction; Circuits; Circulators; Ferrites; Frequency; MMICs; Noise figure; Power dividers; Power generation; Transmitting antennas;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
