Title :
77 GHz Radar Transmitter With PLL Based on a Sub-Harmonic Gilbert Frequency Doubler
Author :
Starzer, Florian ; Forstner, Hans Peter ; Maurer, Linus ; Stelzer, Andreas
Author_Institution :
Johannes Kepler Univ., Linz, Austria
Abstract :
This contribution highlights the usage of a high-quality voltage controlled oscillator (VCO) at 19.25 GHz fundamental frequency with a succeeding times four frequency multiplication scheme facilitating a 77 GHz output frequency. Signal tapping at the VCO´s common emitter node allows obtaining the second-order harmonic tone that drives a single Gilbert frequency doubler. Beneficial to the PLL implementation is a reduced overall prescaler ratio allowing faster frequency ramps.
Keywords :
frequency multipliers; microwave frequency convertors; microwave oscillators; millimetre wave frequency convertors; millimetre wave oscillators; millimetre wave radar; phase locked loops; radar transmitters; voltage-controlled oscillators; PLL; VCO common emitter node; frequency 19.25 GHz; frequency 77 GHz; frequency multiplication scheme; frequency ramps; high-quality voltage controlled oscillator; prescaler ratio; radar transmitter; second-order harmonic tone; sub-harmonic Gilbert frequency doubler; Harmonic analysis; Impedance matching; Phase locked loops; Synthesizers; Tuning; Voltage-controlled oscillators; Wireless communication; Offset phase-locked loop (OPLL); voltage controlled oscillator (VCO);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2014.2321227
