Kratos Microwave Electronics Division (KMED)

Full Line Product Catalog

Microwave Synthesizer SERIES SM60 With MODULATION

1 μsec Fast Indirect Synthesizer With Modulation

Applications Notes for RF oscillators Other Microwave Synthesizers
KRATOS General Microwave has enhanced the the series SF60 fast, broadband, indirect synthesizer by adding a modulation function. With this function, the synthesizer is well suited for use in various test systems where the signal output of the signal generator needs to be modulated rather than be just a CW signal. The modulation input can be an analog voltage or a digital signal. This provides the system designer with more flexibility in his application and possibilities for complex modulation options. Fig. 1 is the spectrum of the output signal with a 1 MHz sine-wave modulation input. Of special importance is the fact, that this synthesizer remains fully locked even during frequency modulation. As a result of it, the high frequency accuracy and other high performances of the synthesizer are kept all of the time. For this reason, in this synthesizer there isn’t the “movement” of the center frequency nor the problem of non linearized modulation.

Each synthesizer is supplied with an internal reference crystal oscillator. The customer has the option of connecting an external reference crystal oscillator.


   

 


APPLICATIONS
The Model SM6218 Fast Synthesizer, with Frequency Modulation capability, was developed as an enhancement to the existing Series SF60 1 usec, CW Synthesizer family. It offers a higher performance and cost effective alternative to signal generators currently used in various applications such as Test Systems and especially those which require improved frequency accuracy, phase noise and frequency modulation capabilities. In addition, the Model SM6218 design allows the flexibility to customize performance to specific application requirements. For military applications, this synthesizer requires option G09 to comply with Military Standards. 

     
 
  • High Speed: 1μSec
  • Wide Frequency range: 2 to 20 GHz
  • Low Phase Noise
  • Small Size
  • High Reliability
  • Internal Reference Crystal Oscillator
  • Severe Environmental Conditions - Option
    Microwave Synthesizer Series SM60 with Modulation
     MODEL SM6218

 

   
   SM SYNTHESIZER BLOCK DIAGRAM
 

 

MODEL SM6218 - TYPICAL MODULATION SPECTRUM

 

GHz Modulation Spectrum using a Sine wave Signal
Fig. 1 - 1 GHz Modulation Spectrum using a Sine wave signal
GHz Modulation Spectrum using a Triangle signal
Fig. 2 - 1 GHz Modulation Spectrum using a Triangle signal
 
      SPECIFICATION
  PARAMETER  MODEL SM6218
  MODEL SM6618  MODEL SM6220
1  FREQUENCY RANGE (GHz)  2 to 18 (1)  6 to 18 (1)  2 to 20 (1)
 2  ACCURACY (PPM) ±2
 3  FREQUENCY AGING (PPM) ±2 First year.    ±1 per year, after first year
 4  OUTPUT POWER
4.1  Min. (dBm) (1)  10
 4.2  Variation, over freq. at a given  temp., max. (dB)   ±1.5
 4.3  Variation, over temperature, max. (dB)  ± 2.5
 5  SETTLING TIME (2) , max. (µsec)
 1
 6  SSB PHASE NOISE , max (dBc/Hz)
 6.1     @ 100 Hz Offset  -60   -60
 6.2     @ 1 kHz Offset  -85  -84
 6.3     @ 10 kHz Offset  -97  -96
 6.4     @ 100 kHz Offset  -97  -96
 6.5     @ 1 MHz Offset  -97  -96
 6.6     @ 10 MHz Offset  -100  -99
 7  HARMONICS, max (dBc)  -30 (up to 24 GHz) 
 8  SUB-HARMONICS, max (dBc)  -55
 9  SPURIOUS, max (dBc) (3)  -55  -54
 10  FREQUENCY CONTROL (PARALLEL)  18 BITS
 11  FREQ. STEP SIZE, nominal LSB (kHz) (1)  100
 12  REFERENCE CRYSTAL OSCILLATOR - EXTERNAL (OPTIONAL) (4)
 12.1     INPUT FREQUENCY, (MHz) (5)  100
 12.2     INPUT POWER,  (dBm) 0 ± 2
 13  MODULATION
 13.1     Bandwidth, (MHz)  DC to 10
 13.2     Frequency Deviation, min. (MHz)  ± 500
 13.3     Sensitivity control (3 levels plus Mod. OFF)  2 BITS
 13.4     Digital Sensitivity, nominal (MHz/bit)  1, 1/4, 1/16, Mod. OFF
 13.5     Analog Control, (V)  ± 1
 13.6     Analog Sensitivity, nominal (MHz/V)  500, 125, 31.25 Mod. OFF
 13.7    Analog Modulation Input Impedance, Ω 50
 13.8    Modulation input to RF output propagation delay typ. (ns) 450 
 14  POWER SUPPLY REQUIREMENT, max. (A)
 14.1     +12V to +15V  3.3
 14.2     -12V to -15V  0.45
 14.3     +5V ±5%  2.1
 15  OPERATING TEMP. (°C) (1)  -20 to +70
 16  OTHER ENVIRONMENTAL PARAMETERS  APPLICABLE FOR AIRBORNE APPLICATIONS
 17  DIMENSIONS, Inches (mm)  6.48 (164.6) x 6.23 (158.2) x 1.24 (31.5)
     
     
  (1) Other values are available. Please contact Sales.
(2) To within ±1 MHz from the final frequency
(3) Spurious level is guaranteed during modulation at OFF state. When modulation is set to ON, the spurious
     level is -50 dBc typical.
(4) External reference crystal oscillator - optional
  (5) 10 MHz Optional  
 
 

 

 

    
OPTION (G09) ENVIRONMENTAL CONDITIONS
 1  Storage Temperature -40 to +120C
2  Mechanical Shock  MIL STD-202F, Method 213B, Cond. B (75G, 6 msec)
 3  Vibration  MIL STD-202F,  Method 204D, Cond. B (.06” double amplitude or 15G, whichever is less)
 4  Humidity MIL STD-202F,  Method 103B, Cond. B (96 hrs. at 95%)
 5  Altitude  MIL-STD-202F, Method 105C, Cond. B (50,000 ft.)


AVAILABLE OPTIONS

 Option No.   
Description
 G02  Operating Temperature -40 to +70C
 G09  Meeting the specified Environmental Ratings
 G15  Analog Modulation (J4) - Input Impedance 1KΩ

DIMENSIONS and WEIGHT MODELS SM6218, SM6618 & SM6220

 

 

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

Weight (Approx.): 1,4 Kg (3.1 Pounds)

Functions for Power Connector J3 and Control Connector J2


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