Series 195 Octave-Band PIN Diode Attenuator/Modulator

Application Notes for Microwave Attenuators

Series 195 current-controlled attenuator/modulators provide small size with greater than octave-bandwidth performance at low cost. All models except the 1950A* provide a minimum of 60 dB of attenuation with fall times of 20 nsec max, and rise times ranging from 25 nsec for the 1951 and 1952 to 125 nsec max for the 1956 and 1958. The 1950A* provides a minimum of 80 dB of attenuation with a fall time of 50 nsec max and a rise time of 250 nsec max. These characteristics make this series suitable for a wide range of applications including level setting, complex amplitude modulation, pulse modulation and high-speed switching. The eight models in the Series 195 encompass a frequency range from 0.5 to 18 GHz. All models except the 1950A* are capable of extended bandwidth operation, typically 3:1, with only moderate degradation in performance at the band edges.

As shown in figures 1 and 2 below, the RF circuit employed in all models except the Model 1950A* uses two shunt arrays of PIN diodes and two quadrature hybrid couplers. The quadrature hybrids are of a unique GMC microstrip design which are integrated with the diode arrays to yield a minimal package size. The RF circuit employed in the Model 1950A* uses one shunt array of PIN diodes with input and output impedance matching circuits.

*Model 1950A is a special-order product. Consult factory before ordering.

MODEL	FREQUENCY RANGE (GHz)	MAX. INSERTION LOSS	MAX. VSWR	MAX. FLATNESS (± dB) AT MEAN ATTENUATION LEVELS UP TO
				10 dB	20 dB	40 dB	60 dB	80 dB
1950A*	0.5 - 1.0	1.4	2.0	0.3	0.8	1.7	2.2	3.2
1951	1.0 - 2.0	1.3	1.5	0.3	0.8	1.5	1.6
	0.75 - 2.25(1)	1.4	2.0	0.5	1.4	3.0	3.5
1952	2.0 - 4.0	1.5	1.5	0.3	0.8	1.5	1.6
	1.5 - 4.5(1)	1.6	2.0	0.5	1.4	3.0	3.5
1953	2.6 - 5.2	1.7	1.6	0.3	0.8	1.5	1.6
	1.95 - 5.85(1)	1.8	2.1	0.5	1.4	3.0	3.5
1954	4.0 - 8.0	2.0	1.7	0.3	0.8	1.5	1.6
	3.0 - 9.0(1)	2.1	2.2	0.5	1.4	3.0	3.5
1955	5.0 - 10.0	2.2	1.7	0.5	0.9	1.5	1.6
	3.75 - 11.25(1)	2.3	2.2	0.7	1.4	3.0	3.5
1956	6.0 - 12.0	2.3	1.8	0.7	1.0	1.5	1.6
	4.5 - 13.5(1)	2.4	2.2	0.9	1.5	3.0	3.5
1958	8.0 - 18.0	2.5(2)	1.8(2)	0.7	1.0	1.5	1.6
	6.0 - 18.0(1)	2.5(2)	1.8(2)	0.9	1.5	3.0	3.5

NOTES
(1) Specifications for the extended frequency ranges are typical.
(2) Except from 16-18 GHz where Insertion loss is 3.5 dB max and VSWR is 2.0 max.

*Model 1950A is a special-order product. Consult factory before ordering.

PERFORMANCE CHARACTERISTICS

Mean Attenuation Range 1950A* ................................................ 80 dB All other units ..................................... 60 dB Monotonicity ...................................... Guaranteed Phase Shift ......................................... See Application Note Temperature Effects ........................... See Fig. 3 Power Handling Capability    Without Performance Degradation    1950A*,1951 ................................... 10 mW cw or peak    All other units .................................. 100 mW cw or peak           Survival Power (from -65°C to +25°C;           see Fig. 4 for higher temperatures)       All units ........................................ 1 W average 25W peak                    (1 µsec max pulse width)

Switching Speed    Fall Time      1950A* ......................... 50 nsec max(3)      All other units ............... 20 nsec max(3)    Rise Time      1950A* ......................... 250 nsec max(3)      All other units ............... 125 nsec max(3) Bias Current for Maximum Attenuation       1950A* .......................... 5 to 35 mA       All other units ................. 15 to 70 mA  NOTE (3) For attenuation steps of 10 dB or more.

*Model 1950A is a special-order product. Consult factory before ordering.

 

 

 

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

AVAILABLE OPTIONS Option No.         Description 3 SMA female bias connector 7 Two SMA male RFconnectors 10 One SMA male (J1) and one SMA female (J2) RF connectors 64 SMC male bias connector 64A SMB male bias connector  G09 Guaranteed to meet Environmental Ratings G12 RoHS Compliant G18 REACH Compliant

DIMENSIONS AND WEIGHTS

Dimensions are stated in inches (mm).  Tolerances, unless otherwise indicated: .XX ±.02; .XXX ±.008 

 

The information contained in this data sheet is basic marketing information and does not contain any export controlled information.