NJT1946A X-Band Radar Front End NJT1946A is designed for the front end of marine radar system. It features a small size and a lightweight operable at any frequency between 9.345GHz and 9.475GHz This front-end module consists of GaAs FET low noise amplifier, Image rejection mixer and Local VCO with buffer amplifier. FET monitoring circuit is included to monitor FET drain current. The stability of the local VCO frequency by the input RF power is increased effectively by the buffer amplifier which is located between image rejection mixer and local VCO. ---- ELECTRICAL ---- <at 25 degree centigrade> Min Typical Max Operating Voltage 4.8 5.0 5.2 Operating current 80 Local frequency VT = 4V 9.38 VT = 24V 9.56 Noise figure 3.5 Conversion gain 3.0 7.0 1dB Gain compression point(RF Port) -10 -8 Monitor voltage 50 RF single pulse burnout(Note1) 600 RF repetitive Pulse burnout(Note2) 400 Unit V mA GHz GHz dB dB dBm mV mW mW Notes: 1. f=9.41GHz, Pd=10nsec 2. f=9.41GHz, Pd=1us, Duty=0.001 ---- BLOCK DIAGRAM ---Balanced Mixer WG-MIC Transition LNA 0° 0° TUNE Buffer Amplifier Divider RF IN 90° Mori CKT 0° ∼ IF OUT Lo. VCO Balanced Mixer MONITOR OUT For further information on the use of the front end, please contact New JRC. New JRC reserves the right to change the specification of goods without notice. Technical Information NJT1946A X-band Radar Front End (1) Input power level vs. output power level characteristic (P1dB) 10 fLO=9470 MHz fRF=9410 MHz fIF= 60 MHz OUTPUT POWER (dBm) 5 0 -5 -10 -15 -20 -25 -20 -15 -10 INPUT POWER -5 0 5 (dBm) (2) Tuning frequency characteristic (MHz) 9550 LOCAL FREQUENCY 9600 9500 9450 9400 9350 0 5 10 TUNE VOLTAGE 15 (V) 20 25