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.

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. The specific environmental MIL STD requirements as well as the EMI/RFI specifications should be provided by the customer.

 

 

    • High Speed: 1 µsec
    • Wide Frequency Range: 2 to 18 GHz
    • Modulation Span: 1 GHz
    • Analog & Digital Modulation Input
    • Small Size
    • High Reliability
    • Severe Environmental Conditions

 

Microwave Synthesizer Series SM60 with Modulation

 MODEL SM6218 - TYPICAL MODULATION SPECTRUM
      GHz Modulation Spectrum using a Sine wave Signal  GHz Modulation Spectrum using a Triangle signal

    Fig. 1 - 1 GHz Modulation Spectrum using a Sine wave signal

   Fig. 2 - 1 GHz Modulation Spectrum using a Triangle signal

 

 SERIES SM60 SYNTHESIZER SPECIFICATIONS

 

      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  Same (PPM) as of the reference crystal oscillator
 3  FREQUENCY AGING  Same (PPM) as of the reference crystal oscillator
 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 (6) , max. (µsec)
 1
 6  SSB PHASE NOISE , max (dBc/Hz) (4)
 6.1     @ 100 Hz Offset  -75   -74
 6.2     @ 1 kHz Offset  -90  -89
 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
 8  SUB-HARMONICS, max (dBc)  NA
 9  SPURIOUS, max (dBc) (2)  -55  -54
 10  FREQUENCY CONTROL (PARALLEL)  18 BITS
 11  FREQ. STEP SIZE, nominal LSB (kHz) (1)  100
 12  REFERENCE CRYSTAL OSCILLATOR - EXTERNAL (3)
 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)  512, 128, 32, Mod. OFF
 13.7    Analog Modulation Input Impedance, Ω 50
 14  POWER SUPPLY REQUIREMENT, max. (A)
 14.1     +12V to +15V  3.2
 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) Spurious level is guaranteed during modulation at OFF state. When modulation is set to ON, the spurious
     level is -50 dBc typical.
(3) Internal Reference Oscillator is optional
(4) With an external reference oscillator with the following phase noise dBc/Hz
     @ 100 Hz Offset: -125
@ 1 kHz Offset: -140
@ 10 kHz Offset: -155
@ >100 kHz Offset: -160
 

(5) 10 MHz Optional

(6) To within ± 1 MHz from rhe final frequency

 

 

   
   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, whitchever 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
 G01   Internal Reference Crystal Oscillator
 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 and weight Models SM6218 and SM6219 Synthesizers DIMENSIONS   IN INCHES (mm

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

Functions for Power Connector J3 and Control Connector J2