Title :
A low-noise broadband SiGe mixer for 24GHz ultra-wideband automotive applications
Author :
Gresham, Ian ; Jenkins, Alan
Author_Institution :
Corp. Res. & Dev., M/A-COM, Lowell, MA, USA
Abstract :
The design and measured results for a broadband, miniature active mixer for use in a direct-down conversion I/Q receiver is presented. The high instantaneous bandwidth of a short-pulse radar system requires a broadband frequency domain response. In addition, the cost constraints and thermal demands require the RF front-end of the automotive radar system to be highly integrated, and energy efficient. The mixer displays a conversion gain of over 20 dB - including the contribution of the base band output stage - over the 3 GHz-35 GHz frequency range for an IF frequency of 500 MHz and an LO drive of 0 dBm. The double-side band (DSB) noise figure of the mixer is less than 8 dB at 24 GHz. The circuit occupies less than 0.075 mm2. The entire mixer, including biasing circuitry, requires only 22 mA from a +5 V supply.
Keywords :
Ge-Si alloys; III-V semiconductors; MMIC frequency convertors; MMIC mixers; radar receivers; road vehicle radar; ultra wideband radar; 22 mA; 3 to 35 GHz; 5 V; 500 MHz; I/Q receiver; RF front-end; SiGe; automotive radar system; biasing circuitry; broadband frequency domain response; broadband mixer; conversion gain; cost constraints; direct-down conversion; double-side band noise figure; low-noise broadband SiGe mixer; miniature active mixer; short-pulse radar system; thermal demands; Automotive applications; Bandwidth; Circuits; Frequency conversion; Germanium silicon alloys; Mixers; Q measurement; Radar; Silicon germanium; Ultra wideband technology;
Conference_Titel :
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings
Print_ISBN :
0-7803-7829-6
DOI :
10.1109/RAWCON.2003.1227967
