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This paper presents the design and simulation of a CMOS ultra-wideband transmitter using TSMC 0.13μm CMOS technology. The operating frequency band of the transmitter is from 22 to 29 GHz for the application of UWB vehicular shortrange radar (SRR). The proposed transmitter has a pulsemodulated carrier-based architecture with bi-phase modulation. The simulation results show that the power spectral density of the transmitter output complies with the FCC regulation, and has a center frequency of 25.2 GHz and a -10 dB bandwidth from 22.9 to 27.6 GHz.

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