D1958-62 - Herley Industries, Inc.

Defense Electronics> Microwave Products> Attenuators & Modulators Selection Guide View Printable Version

Series D195 Octave-Band

PIN Diode Attenuator/Modulators

How to Buy Application Notes

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

(1) Specifications for the extended frequency ranges are typical.

(2) Except from 16 - 18 GHz where insertion loss is 4.0 dB max and VSWR is 2.0 max.

PERFORMANCE CHARACTERISTICS

The Series D195 voltage-controlled linearized attenuator/modulators are integrated

assemblies consisting of a Series 195 unit and a hybridized driver circuit which

provides a nominal transfer function of 10 dB per volt. (See figure 1 below.)

All of the Series D195 units except the D195OA* exhibit fall times of 20 nsec max

and rise times of 1.5 µsec max for attenuation steps of 10 dB or more. For smaller

excursions, the fall times can increase to several hundred nsec, while the rise

times remain essentially unchanged. In applications where a rapid return to

insertion loss from any level of attenuation is required, Option 59 is available. With

this option, an external pulse is applied to trigger a high-speed reset circuit, and

recovery times of 200 nsec max are obtained. Where use of an external reset

pulse as described above is not feasible, an internal reset option (Option 58) is

available which will automatically reset the unit to insertion loss within 200 nsec for

a step of 50 dB or more. The fall and rise time specifications for the D1950A* are

500 nsec max and 10 µsec max, respectively. Options 58 and 59 are not available

for this model.

*Model D1950A is a special-order product. Consult factory before ordering.

Absorptive

Linearized

Frequency range: 0.5 to 18 GHz

High performance MIC quadrature

hybrid design

High speed

ALL UNITS

IN THIS SERIES

ARE EQUIPPED

WITH INTEGRATED DRIVERS

MODEL FREQUENCY RANGE (GHz) MAX. INSERTION LOSS (dB)

MAX. VSWR

FLATNESS (±dB)

AT MEAN ATTENUATION LEVELS UP TO

10 dB 20 dB 40 dB 60 dB 80 dB

D1950A* 0.5 - 1.0 1.4 2.0 0.3 0.8 1.7 3.0 3.6

D1951 1.0 - 2.0 1.6 1.5 0.3 0.8 1.5 1.6

0.75 - 2.25(1) 1.7 2.0 0.5 1.4 3.0 3.5

D1952 2.0 - 4.0 1.8 1.5 0.3 0.8 1.5 1.6

1.5 - 4.5(1) 1.9 2.0 0.5 1.4 3.0 3.5

D1953 2.6 - 5.2 2.0 1.6 0.3 0.8 1.5 1.8

1.95 - 5.85(1) 2.1 2.1 0.5 1.4 3.0 3.5

D1954 4.0 - 8.0 2.4 1.7 0.3 0.8 1.5 1.6

3.0 - 9.0(1) 2.5 2.2 0.5 1.4 3.0 3.5

D1955 5.0 - 10.0 2.6 1.7 0.5 0.9 1.5 1.6

3.75 - 11.25(1) 2.7 2.2 0.7 1.4 3.0 3.5

D1956 6.0 - 12.0 2.7 1.8 0.7 1.0 1.5 1.6

4.5 - 13.5(1) 2.8 2.2 0.9 1.5 3.0 3.5

D1958 8.0 - 18.0 3.0(2) 1.8(2) 0.7 1.0 1.5 1.6

6.0 - 18.0(1) 3.0(2) 1.8(2) 0.9 1.5 3.0 3.5

Mean Attenuation Range

D1950A* .......................... 80 dB

All other units ................... 60dB

Accuracy of Attenuation

O to 3OdB ....................... ±0.5 dB

> 30 to 50 dB ................... ±1.0 dB

> 50 to 60 dB ................... ±1.5 dB

> 60 to 80 dB ................... ±2.0 dB

(D195OA*only)

Monotonicity ...................... Guaranteed

Phase Shift ........................ See Application Note

Temperature Coefficient ...... ±0.025 dB/ C

Power Handling Capability

Without Performance Degradation

D1950A*,D1951 ............ 10 mW cw or peak

All other units ................ 100 mW cw or peak

Survival Power (from -65%C to +25%C;

see Fig. 2 for higher temperatures)

All units.......................... 1 W average 25W peak (1 µsec max

pulse width)

Switching Characteristics

Off Time

D195OA* ................... 600 nsec max

All other units ............. 100 nsec max

On Time

D1950A* ................... 10 µsec max

All other units ............. 1.6 µsec max

Fall Time

D1950A* ................... 500 nsec max

All other units ............. 20 nsec max

Rise Time

D195OA* ................... 10 µsec max

All other units ............. 1.5 µsec max

Nominal Control Voltage Characteristics Range

Operating

Maximum

D195OA* 0 to + 8V ± 15V

All Other Units 0 to + 6V ± 15V

Transfer

Function .................

10 dB / volt

Input

Impedance ...................

10 Kohms

Modulation Bandwidth

Small Signal

D195OA* ................... 25 kHz

All other units ............. 500 kHz

Page

Herley: Series D195 Octave

Band

11/17/2009

http://www.herley.com/index.cfm?act=product&prd=69

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

(1) Where use of an Option 59 external reset pulse (see note 2 below) is not feasible, this option is available which will

automatically sense the slope and magnitude of the control signal and reset the unit to the insertion loss state within

200 nsec for a stop of 50 dB or more.

(2) An external terminal is provided for the user to apply a fast (10 nsec, max rise time) positive-going 3-volt pulse at

least 0.5 µsec wide to accelerate the return of the attenuator to the insertion loss state with the simultaneous

lowering of the control signal to the zero voltage level. This reset can be accomplished within 200 nsec.

(3) The input impedance of units equipped with Option 59 is a circuit equivalent to approximately 50 pF in series with a

parallel combination of 100 pF and 1000 ohms.

Dimensions and Weights

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

Large Signal

D195OA* ................... 5 kHz

All other

units .................

50 kHz

Power Supply

Requirements ..............

+12V 5%, 100 mA

-12V 5%, 50 mA

Power Supply

Rejection .....................

Less than 0.1 dB / volt change in

either supply

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 control connector

7 Two SMA male rf connectors

10 One SMA male (J1) and one

SMA female (J2) RF connector

58 Internally-generated reset to

insertion loss (not available on

D1950A)(1)

59 Externally-triggered reset to

insertion loss (not available on

D1950A*)(2)(3)

61 20 dB / volt transfer function with

0 to +3V control signal input (+4V

for the D1950A*)

62 ± 15 volt operation

64 SMC male control connector

64A SMB male control connector

* Model 1950A is a special

order product. Consult factory before ordering.

Page

Herley: Series D195 Octave

Band

11/17/2009

http://www.herley.com/index.cfm?act=product&prd=69