Title :
A broadband down converter for 4- and 6-GHz radio systems
Author :
Ho, C. ; Kandpal, P.C.
Author_Institution :
Rockwell Int. Corp., Dallas, TX, USA
Abstract :
A description is given of the design of a broadband downconverter to cover both 4-GHz and 6-GHz common carrier bands. The downconverter was tested as a replacement for the downconverter in both the MDR-2204 and MDR-2306 4-GHz and 6-GHz radio systems, respectively. Excellent results have been observed in both radio systems. In threshold bit error rate (BER) tests, the downconverter provided 1.2-dB better performance than both radio systems. In overload BER tests, the downconverter showed a 0.5-dB better performance. The features credited for the good performance are: (1) the noise figure of the low-noise amplifier is less than 1.7 dB over the band; (2) the phase noise of the local oscillator is quite low; (3) the two-tone third-order intercept point of the downconverter is above 26 dBm; and (4) the image rejection is greater than 20 dB over the band.<>
Keywords :
digital communication systems; error statistics; frequency convertors; microwave links; radio equipment; radio systems; solid-state microwave circuits; 4 GHz; 6 GHz; MDR-2204; MDR-2306; bit error rate; broadband down converter; common carrier bands; digital transmission; image rejection; local oscillator; low-noise amplifier; microwave links; noise figure; overload BER tests; phase noise; radio systems; threshold BER tests; two-tone third-order intercept point; Bandwidth; Bit error rate; Broadband amplifiers; Circuits; FETs; Low-noise amplifiers; Noise figure; Oscillators; Power dividers; System testing;
Conference_Titel :
Microwave Symposium Digest, 1988., IEEE MTT-S International
Conference_Location :
New York, NY, USA
DOI :
10.1109/MWSYM.1988.22185
