Title :
A 10-14 GHz linear MMIC vector modulator with less than 0.1 dB and 0.8 degrees amplitude and phase error
Author :
van den Bogaart, F.L.M. ; Pyndiah, R.
Author_Institution :
Lab. d´´Electron. Philips, Limeil-Brevannes, France
Abstract :
The design, fabrication, and performance of a GaAs monolithic linear vector modulator in the 10-14 GHz band is described. The circuit exhibits sideband and carrier rejections of more than 45 dB with third-order intermodulation signals at -40 dBc. Such performance has never been obtained in hybrid or monolithic technology. The design is based on symmetrical circuits. The vector modulator comprises two monolithic binary-phase-shift keying (PSK) modulators, a monolithic quadrature power divider, and a Wilkinson power combiner. The modulator is ideal for direct 16-quadrature amplitude modulation (QAM) in X-Ku-band digital radio links and satellite communications. Due to its linearity, amplitude, and phase precision, it has numerous applications, such as for an analog phase shifter for phased-array antennas or for a single-sideband up converter.<>
Keywords :
III-V semiconductors; MMIC; amplitude modulation; gallium arsenide; modulators; phase shift keying; 10 to 14 GHz; 16-quadrature amplitude modulation; GaAs; Ku-band; MMIC; PSK modulators; SHF; Wilkinson power combiner; X-band; analog phase shifter; binary-phase-shift keying; digital radio links; direct 16-QAM; fabrication; monolithic linear vector modulator; monolithic quadrature power divider; phased-array antennas; satellite communications; symmetrical circuits; Amplitude modulation; Circuits; Digital modulation; Fabrication; Gallium arsenide; MMICs; Phase shift keying; Power combiners; Power dividers; Vectors;
Conference_Titel :
Microwave and Millimeter-Wave Monolithic Circuits Symposium, 1990. Digest of Papers., IEEE 1990
Conference_Location :
Dallas, TX, USA
DOI :
10.1109/MCS.1990.110956
