Series D197 Voltage Controlled Phase Invariant Attenuators

  Contact Us        

Application Notes for Microwave Attenuators

The Series D197 voltage controlled PIN diode attenuators offer essentially phase free operation over a wide dynamic range in multi-octave frequency bands between 2 and 18 GHz. The attenuators utilize a unique double balanced arrangement of diodes and quadrature couplers to achieve the phase independent attenuation characteristic. Excellent temperature stability is maintained by employing a self-compensating biasing scheme. (See Fig. 1.)

Series D197 attenuator RF schematic diagram

 

  • Low phase shift
  • Frequency range: 2-18 GHz
  • Non-reflective
  • Attenuator range: to 45 dB
  • Linearized control: 10 dB/V
  • High speed

 

Series D197 Voltage controlled phase invariant attenuator

 

TYPICAL PERFORMANCE

 

Series D197 attenuation vs frequency performance diagram series D197 phase vs frequency performance diagram

 

PERFORMANCE CHARACTERISTICS

 

MODEL D1972 D1974 D1978
Frequency Range (GHz) 2 - 6 4-11 6-18
Mean Attenuation Range 32 dB
Insertion Loss (Max) 4 dB 5 dB 7 dB
VSWR (Max) 2.0  3.0
Accuracy of Attenuation           ± 0.5 dB
Amplitude Flatness                 0 to 20 dB
                                            >20 to 32 dB
± 0.4 dB ± 0.4 dB ± 0.8 dB(1)
± 0.6 dB ± 0.8 dB ± 1.3 dB(1)
Monotonicity Guaranteed
Phase Shift                              0 to 20 dB
                                            >20 to 32 dB
± 4° ± 4° ± 5°
± 8° ± 8° ± 10°
Control Voltage 0-3.2 V
Control Input Impedance 10 kohms
Transfer Function 10 dB/V
On Time, Off Time 250 nsec
Temperature Coefficient          0 to 20 dB
                                            >20 TO 32 dB
0.01 dB/°C
0.03 dB/°C
Max. RF Power Input (Operating) 100 mW
Max. RF Power Input (Survival) 0.5 W
Harmonic Distortion @ Pin = +10 dBm -40 dBc -50 dBc -50 dBc
Power Supply Requirements +15V ±5% @ 200 mA
-15V ±5% @ 120 mA

SPECIFICATIONS With EXTENDED RANGE OPTION (OPTION 45)
Mean Attenuation Range 45 dB
Accuracy of Attenuation                         0 to 20 dB
                                                         >20 TO 32 dB
                                                                   >32 dB
± 1.0 dB
± 2.0 dB
± 3.5 dB
Amplitude Flatness                                0 to 20 dB
                                                         >20 TO 32 dB
                                                                   >32 dB
± 0.4 dB ± 0.4 dB ± 0.8 dB(1)
± 0.6 dB ± 0.8 dB ± 1.3 dB(1)
± 1.5 dB ± 1.5 dB ± 2.0 dB
Phase Variation                                     0 to 20 dB
                                                         >20 TO 32 dB
                                                                   >32 dB
± 4° ± 4° ± 5°
± 8° ± 8° ± 10°
± 15° ± 20° ± 30°

1) Except from 8-18 GHz, flatness is ± 0.5 dB up to 20 dB, ± 1.0 dB up to 32 dB.

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 (0.06" 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

AVAILABLE OPTIONS
Option No. Description
7 Two SMA male rf connectors
10 One SMA male(J1) and one SMA female (J2) rf connector
45 Extended attenuation range to 45 dB
65 ± 12V operation
G09 Guaranteed to meet Environmental
Ratings
G12 RoHS Compliant
G16 RoHS Plus REACH Compliant

     
DIMENSIONS AND WEIGHT

series D197 dimensions and weight diagram

MODEL A B C D E F G H
D1972 2.5 (63,5) 2.26 (57,4) 2.28 (57,9) 0.22 (5,6) 0.91 (23.1) 1.25 (31,7) 1.5 (38,1) 1.7 (43,2)
D1974 2.0 (50,8) 1.76 (44,7) 2.43 (61,7) 0.18 (4,6) 0.66 (16,8) 1.0 (25,4) 1.25 (31,7) 1.45 (36,8)
D1978 2.0 (50,8) 1.76 (44,7) 2.58 (65,5) 0.18 (4,6) 0.66 (16,8) 1.0 (25,4) 1.25 (31,7) 1.50 (38,1)