Millimeter-wave linear fast-chirp pulse generator in 65-nm CMOS technology

A millimeter-wave linear fast-chirp pulse generator for a pulse compression radar system has been developed. It was designed and implemented in 65-nm CMOS technology. The linear and fast chirp pulse generation was demonstrated with the maximum frequency chirp rate of 0.96 GHz/us, representing to the authors' knowledge the highest rate reported to date for millimeter-wave radar systems. It was achieved by integration of high speed control circuits for a phase locked loop frequency synthesizer. Its operation frequency covers a wide range from 38.0 to 40.5 GHz, which is applicable to 77-GHz and 79-GHz automotive radar bands by doubling the frequency. The operation was also demonstrated at high temperatures up to 125 degrees C. The output power showed little variation with temperature, which was 4.2 dBm at 25 degrees C and 2.7 dBm at 125 degrees C.