ETC NJT1946A

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