GaAs MMICs Drive Vehicle ESR Systems

Jan. 23, 2013
A lineup of integrated circuits serves automotive applications at 77 GHz.

Medium- and long-range automotive radar systems rely on 77-GHz GaAs monolithic-microwave-integrated-circuit (MIC) transceiver components such as frequency mixers and amplifiers. For its part, TriQuint has developed an extensive portfolio of 77-GHz MICs for automotive front-end applications, including adaptive-cruise-control and forward-collision-warning systems. The MMIc have been successfully implemented in multimode electronically scanning radar (ESR) on multiple vehicle platforms.

The firm supports 77-GHz designs with components for both receivers and transmitters. For example, for receivers, the model TGA4705-FC flip-chip low-noise amplifier (LNA) has a frequency range of 72 to 80 GHz, with 23-dB gain across that range and a noise figure of 5 dB at 77 GHz. Based on GaAs pseudomophic-high-electron-mobility-transistor (pHEMT) device technology, the LNA chip measures 2.24 x 1.27 x 0.38 mm and draws a mere 60 mA current from a +2.5-VDC supply. For transmitters, model TGA4706-FC is a medium power amplifier also based on GaAs pHEMT technology. It operates from 76 to 83 GHz with 15-dB typical gain and saturated output power of +14 dBm at 77 GHz. It runs on typical quiescent current of 125 mA at +3.5 VDC. The medium-power amplifier chip, which can be used for either E-band communications or automotive radar, measures just 1.86 x 1.37 x 0.38 mm.

For downconverting signals at 77 GHz to a lower-frequency range for signal processing, the company also offers the model TGC4792-FC flip-chip in-phase/quadrature (IQ) mixer. It has an RF and local-oscillator (LO) frequency range of 75 to 82 GHz and an intermediate-frequency (IF) range of DC to 100 MHz to simplify processing or digitizing of downconverted signals. The flip-chip mixer measures only 2.46 x 1.89 x 0.38 mm and runs on a +1.1-VDC supply.

About the Author

Jack Browne | Technical Contributor

Jack Browne, Technical Contributor, has worked in technical publishing for over 30 years. He managed the content and production of three technical journals while at the American Institute of Physics, including Medical Physics and the Journal of Vacuum Science & Technology. He has been a Publisher and Editor for Penton Media, started the firm’s Wireless Symposium & Exhibition trade show in 1993, and currently serves as Technical Contributor for that company's Microwaves & RF magazine. Browne, who holds a BS in Mathematics from City College of New York and BA degrees in English and Philosophy from Fordham University, is a member of the IEEE.

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