Title :
A 4 to 25 GHz 0.5 W monolithic lossy match amplifier
Author :
Itoh, Y. ; Nii, M. ; Kohno, Y. ; Mochizuki, M. ; Takagi, T.
Author_Institution :
Electro-Opt. & Microwave Syst. Lab., Mitsubishi Electr. Corp., Kanagawa, Japan
Abstract :
A 4 to 25 GHz 0.5 W monolithic lossy match amplifier has been developed. It employs a novel constant-resistance network and a parallel resonant circuit as pre-matching circuits in the design of input and output networks to make the input and output impedance of FETs purely resistive. In addition a quarter-wavelength impedance transformer having a low characteristic impedance is incorporated into the design of interstage networks to match the output impedance of driver FETs and the input impedance of power FETs over a wide bandwidth. With the use of these networks, a two-stage lossy match power amplifier has achieved a linear gain of 8.3/spl plusmn/2.8 dB, a saturated output power of 27.7/spl plusmn/2.7 dBm, and a drain efficiency of 15.3/spl plusmn/8.3% over 4 to 25 GHz.<>
Keywords :
MMIC; circuit resonance; field effect integrated circuits; impedance convertors; impedance matching; linear integrated circuits; microwave amplifiers; power amplifiers; 0.5 W; 4 to 25 GHz; 5.5 to 11.2 dB; 7 to 24 percent; characteristic impedance; constant-resistance network; drain efficiency; input impedance; interstage networks; monolithic lossy match amplifier; output impedance; parallel resonant circuit; power amplifier; pre-matching circuits; quarter-wavelength impedance transformer; saturated output power; Bandwidth; Circuit faults; Driver circuits; FETs; Gain; Impedance matching; Power amplifiers; Power generation; RLC circuits;
Conference_Titel :
Microwave Symposium Digest, 1994., IEEE MTT-S International
Conference_Location :
San Diego, CA, USA
Print_ISBN :
0-7803-1778-5
DOI :
10.1109/MWSYM.1994.335323
