Model 1761 Multi-Octave Digitally Controlled Miniature PIN Diode Attenuator

  Contact Us        

Application Notes for Microwave Attenuators

Model 1761 is a miniaturized, digitally controlled PIN diode attenuator covering the instantaneous frequency range of 2 GHz to 18 GHz. This model, measuring only 1.34” square and 0.5” thick, provides a monotonic attenuation range of 60 dB with 7-bit (0.5 dB LSB) resolution and 1 microsecond switching speed.

The Model 1761 is an integrated assembly of a dual PIN diode attenuator and a driver circuit consisting of a D/A converter and voltage-to-current converter. The unit is fully temperature compensated. The RF circuit consists of two wide band, T-pad attenuator sections in tandem. The levels of series and shunt currents required to maintain bilateral match at all frequencies is provided by the driver. This arrangement assures monotonicity over the full 2 to 18 GHz operating band at all levels of attenuation and for any programmed attenuation step.

The Model 1761 weighs approximately 1.5 oz. It is configured with SMA female RF connectors and a multipin connector for logic and power. The unit is powered by ±12 to 15V DC and the logic input is TTL compatible.

PHASE SHIFT (DEG)
Model 1761 typical phase vs attenuation
MODEL 1761
Fig. 1- Typical phase vs. attenuation

  • Miniature
  • 2 to 18 GHz
  • 7 Bit TTL
  • Hermetically sealed

 

Model 1761 digitally controlled miniature PIN diode attenuator - Kratos General Microwave

 

 

PERFORMANCE CHARACTERISTICS
Frequency Range............... 2 to 18 GHz
Mean Attenuation Range ....... 60 dB
Inserton Loss, Max.................... 4.5 dB
VSWR, max. ...............................  2.0:1
Flatness
    Up to 20 dB........................ ±1.0dB
    Up to 40 dB........................ ±1.25dB
    Up to 60 dB........................ ±3.0dB
Accuracy of Attenuation
    0 to 20 dB.......................... ±1.0dB
    20 to 40 dB........................ ±1.5dB
    40 to 60 dB........................ ±2.0dB
Monotonicity................................. Guaranteed
Temperature Coefficient ..... ±0.02 dB/°C
Power Handling Capability
    Without Performance
        Degradation....................


Up to 50 mW cw or peak
       Survival Power...............



2 W average or peak from -65°C to +25°C; derate linearly to 800 mW at 110°C
Switching Speed
    50% TTL to 90% RF............ 1.0 µsec
Programming............................... 7-Bit TTL Binary
Minimum Attenuation    Step..............................................
0.5 dB
Logic Input
    Logic "O" (Bit OFF)............. -0.3 to +0.8V
    Logic"1" (Bit ON)................ +2.0 to +5.OV
Input Current...................... 10 µA max.
Power Supply
    Requirements
..................
 
+12 to +15V, 100 mA
-12 to -15V, 100 mA
Power Supply
     Rejection
.........................
 
Less than 0.1 dB/volt change in either supply

OPTION (G09) ENVIRONMENTAL RATINGS
Operating Temperature
     Range
........................

-54°C to + 110°C
 Non-Operating  Temperature
    Range......................... -65°C to + 125°C
Humidity......................... MIL-STD-202F, Method 103B, Cond. B (96 hrs. at 95%)
Shock.............................. MIL-STD-202F, Method 213B, Cond. B (75G, 6 msec)
Vibration......................... MIL-STD-202F, Method 204D, Cond. B (.06" double amplitude or 15G, whichever is less)
Altitude........................... MIL-STD-202F, Method 105C, Cond. B (50,000 ft.)
Temp. Cycling................ MIL-STD-202F, Method 107D, Cond. A, 5 cycles

ACCESSORY FURNISHED
Mating power/logic connector
 
AVAILABLE OPTIONS
G09 Guaranteed to meet Environmental Ratings
G12 RoHS Compliant
G16  RoHS Plus REACH Compliant

 

DIMENSIONS AND WEIGHT
Model 1761 attenuator dimensions and weight diagram
PIN FUNCTIONS
PIN
   FUNCTION
A
   GND
B
   LSB 0.5 dB
C
   +V
D
   N.C.
E
   1 dB
F
   -V
H
   N.C.
J
   4 dB
K
   2 dB
L
   N.C.
M
   16 dB
N
   8 dB
P
   GND.
R
   32 dB

Dimensional Tolerances, unless otherwise indicated: XX ± .02; XXX ± .005