Title :
Radar´s TWT phase noise reduction
Author :
Lee, Jae Seung ; Lally, Phil ; Goren, Yehuda ; Luhmann, N.C.
Author_Institution :
California Univ., Davis, CA, USA
Abstract :
The traveling wave tube amplifier (TWTA) requires stringent phase noise performance for radar transmitters. A modified phase locking loop feedback method is introduced to reduce the phase noise by more than 20 dB in CW mode and 15 dB pulsed mode over 500 MHz bandwidth in X-band. A double balanced mixer in conjunction with a voltage controlled phase shifter compensates phase noise driven by high voltage power supply (HVPS) which is the major phase noise generator in radar transmitter.
Keywords :
mixers (circuits); noise generators; phase locked loops; phase noise; phase shifters; radar signal processing; radar transmitters; signal denoising; travelling wave amplifiers; 500 MHz; CW mode; TWT phase noise reduction; TWTA; double balanced mixer; high voltage power supply; modified phase locking loop feedback method; phase noise generator; pulsed mode; radar transmitters; stringent phase noise; traveling wave tube amplifier; voltage controlled phase shifter; Bandwidth; Feedback loop; Phase noise; Phase shifters; Power supplies; Pulse amplifiers; Pulsed power supplies; Radar; Transmitters; Voltage control;
Conference_Titel :
Radar Conference, 2005 IEEE International
Print_ISBN :
0-7803-8881-X
DOI :
10.1109/RADAR.2005.1435791
