| Summary: | 碩士 === 國立中興大學 === 電機工程學系所 === 106 === This thesis focus on the research and development for sub-circuits of object detection radar systems. For traditional automotive FMCW radar, the frequency difference between the transmitted signal and the reflected signal is small, thus it has the problem of excessive flicker noise. This paper improves the W-band automotive radar system with the concept of low-IF architecture. By using TSMC''s 90nm CMOS process, we complete the circuit design with a single- sideband up-converter at the transmitter and a down-conversion mixer at the receiver. After a brief introduction to the principle of RF circuit architecture, core circuit designs are as follows:
The single-sideband up-converter for W-band uses orthogonal LO and IF input signals for mixing. The quadrature (I/Q) signals are generated by Lange couplers, baluns, and polyphase filters. The chip area is 0.932×0.603 mm2, and the power consumption is 16.75 mW at a 1.2V supply voltage. The conversion gain measured at LO power -2dBm is -4.17dB. The feature of the single sideband mixer: image rejection and LO leakage suppression are -25.94dBc and -32.98dBc, respectively. Another chip is the W-band direct-conversion receiver design. It includes a preamplifier, a mixer, and an output buffer. The overall chip area is only 0.52×0.525 mm2. Under the supply voltage of 1.2V, the total power consumption is 30.36mW.
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