Title :
A K-Band Reconfigurable Pulse-Compression Automotive Radar Transmitter in 90-nm CMOS
Author :
Kai-Wen Tan ; An-Hsun Lo ; Ta-Shun Chu ; Hsu, Shawn S. H.
Author_Institution :
Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan
Abstract :
A K-band ultra-wideband (UWB) pulse-compression (PC) automotive radar transmitter in 90-nm CMOS is presented, which is composed of the fully integrated pulse generator, mixer, driver amplifier, phase-locked loop, and timing circuitry. The PC technique with coding gain can effectively enhance the detection resolution and also improve the signal-to-noise ratio (SNR). We propose a PC transmitter allowing fast and precise code generation with small power consumption and chip area, and also offering reconfigurable capability. Compared with previously reported UWB pulse radars with relatively simple coding schemes, the proposed transmitter features a much more challenging 15-bit pseudonoise code design using high-speed shift registers, which can improve SNR up to 23.5 dB. The measured results demonstrate correct output waveforms corresponding to different modulation codes with the spectrum well confined under the regulation mask. With a modulation rate over 3 Gb/s (pulse repeat frequency of 6.125 MHz), a resolution of ~ 5 cm can be achieved.
Keywords :
CMOS integrated circuits; microwave amplifiers; microwave mixers; millimetre wave amplifiers; millimetre wave mixers; phase locked loops; pseudonoise codes; pulse compression; pulse generators; radar transmitters; road vehicle radar; ultra wideband radar; CMOS integrated circuit; K-band reconfigurable pulse-compression; K-band ultra-wideband pulse-compression; PC transmitter; UWB pulse radars; UWB pulse-compression; automotive radar transmitter; code generation; driver amplifier; frequency 6.125 MHz; high-speed shift registers; integrated pulse generator; mixer; modulation codes; phase-locked loop; power consumption; pseudonoise code; size 90 nm; timing circuitry; word length 15 bit; K-band; Mixers; Pulse generation; Shift registers; Transmitters; Ultra wideband radar; Automotive radar; CMOS; K-band; pulse compression (PC); transmitter; ultra-wideband (UWB);
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2015.2403835