1 μsec Fast Indirect Synthesizer With Modulation
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.
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| MODEL SM6218 |
| SM SYNTHESIZER BLOCK DIAGRAM |
| MODEL SM6218 – TYPICAL MODULATION SPECTRUM |
| 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 |
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| 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 |
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| 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 |
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| 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 |
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| (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)
