Title :
A
-Band CMOS UWB Radar Transmitter With a Bi-Phase Modulating Pulsed Oscillator
Author :
Lee, Sungeun ; Kim, Choul-Young ; Hong, Songcheol
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea
fDate :
5/1/2012 12:00:00 AM
Abstract :
This paper presents a K-band CMOS UWB radar transmitter with highly accurate variable delay circuits and a bi-phase modulating pulsed oscillator. The UWB radar transmitter is composed of three blocks: variable delay circuits that consist of a digital synchronized counter and a Vernier delay line (VDL), a baseband control signal generator, and a pulsed oscillator. The VDL allows a high range accuracy level of several millimeters. Asymmetric signals generated by the baseband control signal generator can control the phase of each output pulse. Because the pulsed oscillator operates only for the duration of a pulse, it has an extremely low level of DC power consumption and no LO leakage. It is fabricated with 0.13-μm CMOS technology and a chip with dimensions of 0.98 mm × 0.69 mm. The output spectrum is centered at 26.0 GHz, and the pulse width is controllable from 280 to 680 ps. The peak output power is about 2 dBm.
Keywords :
CMOS integrated circuits; delay circuits; field effect MMIC; low-power electronics; microwave oscillators; radar transmitters; signal generators; ultra wideband radar; DC power consumption; K-band CMOS UWB radar transmitter; Vernier delay line; baseband control signal generator; biphase modulating pulsed oscillator; digital synchronized counter; size 0.13 mum; variable delay circuits; CMOS integrated circuits; Delay; Modulation; Oscillators; Switches; Transmitters; Ultra wideband radar; Automotive radar; CMOS ultra-wideband (UWB) pulse generator; UWB radar transmitter; pulsed oscillator; short-range radar (SRR); variable delay circuit;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2012.2188814