Euvis

Arbitrary Frequency Chirping Module, DSM303-V4DSM303-V4 – 3.0 GHz Arbitrary Frequency Chirping Module
P RODUCT DESCRIPTION
The DSM303-V4 module generates arbitrary frequency chirping CW with frequency
update rates up to 312.5 updates/microsecond (1/8 of the clock rate). At 2.5 GSPS, themodule can generate frequency chirping in a bandwidth from DC to 1.25 GHz. The
chirping profile can be linear or arbitrarily programmed. The DSM303-V4 can becontrolled by a PC via GUI or by user application programs via API, or can work alone
with pre-stored chirping waveform. The chirping waveform generations can be incontinuous, triggered continuous, and triggered burst modes. Up to 127 waveforms canbe stored in user pages and users can select which user page to be played on the fly.

Rev 51EuvisArbitrary Frequency Chirping Module, DSM303-V4

KEY F EATURES :
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3 GSPS DDS with 11-bit amplitude and 13-bit phase resolution
Maximum clock rate: 3.0 GHz for CW and 2.5 GHz for chirping
Chirping standard sampling rate at 2.5 GSPS (2.5 GHz clock)
Chirping optional sampling rate range from 1 to 2.5 GSPS (1 to 2.5 GHz clock)
520K x 32-bit memory depth with maximum 127 waveforms
Waveforms can be switched dynamically by selecting user pages on the fly
Minimum waveform length of 256 ns in Burst Mode
Maximum 1.6 millisecond chirping waveform length at 2.5 GHz clock rate and2.1 millisecond chirping waveform length at 2.0 GHz
Programmable phase reset for precise phase repetition
Accepts external triggers and generates marker signals (programmable)
9 W power consumption with a +12V DC wall-mount power supply (included)
USB 2.0 compliant interface (other interfaces available upon request)
Companion API and software drivers for easy system development
GUI with various built-in chirping waveforms

APPLICATIONS•••
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Linear Frequency Modulation (LFM) and chirping
Frequency Modulation Continuous-Wave (FMCW) radar
Agile LO frequency synthesis
Electronic warfare
RF signal source generation
Fast frequency hopping
VSAT satellite communications
Test and measurement equipment2

Arbitrary Frequency Chirping Module, DSM303-V4Euvis
ELECTRICAL SPECIFICATIONS

SymbolPARAMETERMin

TypicalMax

Unito

Operating TemperatureTo

Clock Frequency

fCK12.53GHz

Clock Input PowerPCK

0310dBm

Output Level

Vout-6350mV

Output Power1Pout-40dBm

Output Residue Phase Noise2

Nf-145dBC/HzClock Port Return Loss

RLCK

13dB

Output Port Return Loss

RLRF

15dB

125C

Due to the zero-order-hold DAC response, sinc function
210 KHz offset

TERMINAL DESCRIPTIONName

Rev 5Function

I/O

Signal

GND

GroundDC+12VPower, +12 V

DCDDSOP

Waveform Output PositiveO

RFDDSONWaveform Output Negative

O

RF

DDSCK

Input Clock Source +I

RFTRIGTriggerISYNCIN

Synchronize Input

I

SYNCOUT

Synchronize Output

OMARKER

MarkerO

AUX1

Auxiliary Output

O3

Arbitrary Frequency Chirping Module, DSM303-V4

Euvis
DETAILED SPECIFICATIONSGeneralDDS Frequency Resolution

32 bits

Amplitude / Phase Resolution

11 bits / 13 bits

Frequency Update Rate

1/8 of input clock

Running Modes

Continuous
Triggered Continuous
Triggered Burst / Pulse

User Interface

Windows Graphical User Interface, USB

Input Clock
Type

Single-ended, 50-Ω terminatedConnector TypeSMA

Frequency Range Static

1 to 3 GHz

Frequency Range ChirpingStandard: 2.5 GHz
Optional: 1 GHz to 2.5 GHz

Power Level

0 dBm to 10 dBm

Return Loss

13 dB

Output
TypeDifferential, 50-Ω terminatedConnector Type

SMA

Output Sampling Rate Range

1 GSPS to 2.5 GSPS

Output Maximum Frequency

Half of Sampling Rate

Output Level-635 mV to 0 V

Output Power-4 dBm to 0 dBm

Output Phase NoiseMax. –145 dBc/Hz at 10 KHz from carrier

Output Return Loss

15 dB

TriggerConnector

SMASource

External or Software

Recommended External Trigger

Low Voltage CMOS 3.3V (LVCMOS33)

Minimum Trigger Period

1 us

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EuvisArbitrary Frequency Chirping Module, DSM303-V4

DETAILED SPECIFICATIONS , ( CONTINUED)
Waveform
Max Waveform Length523,264 words in Continuous Modes
519,176 words in Burst Mode

Minimum Waveform Length

32 words in Continuous Modes
256 ns waveform length in Burst Mode

User-Defined Waveform

User defined frequencies and markers

User Pages
Max User Pages

128 in Continuous Modes
127 words in Burst Mode

Maximum Word per User Page

4,088 words

Waveform Length Restriction

Waveform length must be divisible by 4Marker
Number of Markers

1Marker Length

User definedMarker Output Levels

LVCMOS 3.3 V (LVCMOS33)API
CLR (Common Language Runtime) support languages targeting the runtime, such as
C++/CLI, C#, Visual Basic, Jscript, and J#.
Compatible with Matlab 2009a (with .NET framework support)

GUI
Available for Windows XP, Windows Vista and Windows 7Options
Variable Clock Frequency Range from 1 GHz to 2.5 GHz

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EuvisArbitrary Frequency Chirping Module, DSM303-V4

WAVEFORM G ENERATION MODES
The module can be operated in three waveform generation modes: Continuous mode,Triggered Continuous mode and Triggered Burst mode.
Continuous ModeIn Continuous mode, the module starts waveform generation by a Restart command fromthe GUI or API-based application. Once the waveform starts, the module repeats thewaveform continuously. There is no latency between two consecutive waveforms. The
following waveform starts right after the end of the preceding waveform. The waveformgeneration can be aborted by an Abort command from the GUI or API-based application.

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EuvisArbitrary Frequency Chirping Module, DSM303-V4

Triggered Continuous ModeIn Triggered Continuous mode, the operation manner is similar to that in Continuousmode except for the start of waveform. The waveform generation is initiated by a trigger
signal. In order to accept the upcoming trigger signals, the module has to be armed prior
to the instance of the trigger signal. Trigger signals happening before the module isarmed will be ignored. An Arm command from the GUI or API-based applications can beused to arm the module. Once the module is armed, it waits for the trigger signal. Thewaveform generation starts after the falling edge of the trigger signal. The trigger signal
can be applied via the TRIGGER SMA connector or provided by a command Trigger via
the GUI or API-based application.

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Arbitrary Frequency Chirping Module, DSM303-V4

Triggered Burst Mode
In Triggered Burst mode, the module starts waveform generation when it is armed andreceives the trigger signal as in the Triggered Continuous mode. Instead of repeating
continuously, the waveform starts, repeats, and stops after finite repetitions. The numberof the repetitions can be specified by a property Loop Count via the GUI or the APIbased applications. The Loop Count can be set from 1 to 255. Trigger signals occurring
before the module is armed will be ignored. Similarly, trigger signals will be ignored if
the module is in the middle of a waveform. Once the waveform stops, the module willarm itself automatically and wait for the next trigger signal. The diagram below shows
the waveform output when Loop Count is set to 2.

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EuvisArbitrary Frequency Chirping Module, DSM303-V4

The following figure shows waveform generation for different Loop Counts: 1, 2, and 3.

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Arbitrary Frequency Chirping Module, DSM303-V4

WAVEFORM DETAILSThe DSM module includes a 523,776 32-bit word memory so the maximum length of one
waveform is 523,776 frequencies in Continuous Modes. In Burst Mode, the maximum
waveform length is 519,684.
The minimum waveform length depends on the mode of the DSM. In Continuous orTriggered Continuous Mode, the waveform length can be as short as 32 data points. Eachdata point represents one frequency word and lasts 8 input clock periods so at 2.0 GHz,
each data point lasts for 4 ns (1 / 2GHz * 8). The minimum waveform length in Burst
Mode can be as short as 256 ns. Note that the minimum waveform length is defined as an
absolute time in Burst Mode whereas the minimum waveform length in Continuous
Modes is defined in number of data points. This means that the minimum number of data
points that can be chirped in Burst Mode will depend on your input clock. At 2.0 GHz,
256 ns translates to about 64 data points (256ns / 4ns); at 2.5 GHz, the minimum numberof data points is about 80; and at 1.5 GHz, the minimum number of data points is about
48.
The oscilloscope photos below demonstrate some of the capabilities of the DSM. All
three waveforms in the photos are chirping from 1/256 of the input clock frequency to
1/16 of the input clock frequency in steps of 1/256 of the input clock frequency. The
three example waveforms differ in how many times they repeat this chirping segment. As
you can see in Chart 1, each segment will take the waveform through 4.25 phase cycles.

Chart 1

Rev 510

EuvisArbitrary Frequency Chirping Module, DSM303-V4The input clock in the waveforms are all 2.0 GHz, so for each segment of the waveform,
the DSM is chirping from 7.8125 MHz (2000MHz / 256) all the way up to 125 MHz(2000MHz / 16) in 7.8125 MHz steps for a total of 16 data points. There are 8 data points
at the beginning of each waveform that is used for reset and where the phase andfrequency is 0.
The signal at the bottom of each photo is the Marker and goes high at the beginning of
the waveform and stays high for the first 8 data points before going back low again.

Photo 1In Photo 1, the DSM is chirping 4 segments back to back for one complete waveform.
The loop count is set to 1 so the DSM runs the complete waveform one time when itsenses a trigger. At the end of the waveform, the module stops output and waits for thenext trigger. The total waveform length is 72 data points (8 reset frequencies + 4 * (16data points per segment) = 72), which translates to about 288 ns. Figure 1 shows theideal waveform of Photo 1.

Figure 1

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EuvisArbitrary Frequency Chirping Module, DSM303-V4

Chart 2Each frequency “triangle” shown in red in Chart 2 represents one of the four chirping
segments of the waveform in Photo 1. The phase is shown in blue. Recall that eachsegment will take the waveform through 4.25 phase cycles. After the first segment, thewaveform has completed 4.25 phase cycles. After the second segment, the waveform hascompleted 8.5 phase cycles. After the third segment, the waveform has completed 12.75
phase cycles. Finally, after the fourth segment, the waveform has completed 17 phase
cycles and is back at the original starting point. Figure 1 shows where the segments onthe waveform are.

Figure 2

Rev 512EuvisArbitrary Frequency Chirping Module, DSM303-V4

Photo 2In Photo 2, the DSM is chirping the same complete waveform as in Photo 1 but this time
the loop count is set to 2. When the module senses a trigger, it will run the complete
waveform two times in succession and at the end of the second complete waveform, theDSM will stop output and wait for the next trigger. The total waveform length is about
544 ns at 2.0 GHz. Figure 3 shows ideal waveform of Photo 2.

Figure 3

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Arbitrary Frequency Chirping Module, DSM303-V4

Photo 3
Photo 3 demonstrates how short a waveform can be. This time, only one segment (1/256of clock to 1/16 of clock in 1/256 of clock steps) is output as opposed to the 4 cycles in
Photos 1 and 2. The first 8 data points consist of resets while the next 16 data points is thechirping segment. The total length is therefore 24 frequencies, which is only about 96 ns
at 2.0 GHz. Figure 4 shows the ideal waveform of Photo 3.

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Arbitrary Frequency Chirping Module, DSM303-V4

Chart 2Chart 2 shows the frequency and phase that the waveform in Photo 3 goes through. At theend of the waveform, it will have gone through 4.25 phase cycles.

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Arbitrary Frequency Chirping Module, DSM303-V4

B OARD DIAGRAM

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Arbitrary Frequency Chirping Module, DSM303-V4Euvis

DIMENSIONS AND MOUNT HOLE LOCATIONS
Length

5.0 inches

Width

4.0 inches

Height0.7 inches with heat sink
0.6 inches without heat sink

WeightLess than 1 lb

4 Mount HoleLocations(mils.
Origin is lower leftcorner)

125, 3875
3875, 4875
3875, 125
125,125

Ordering Information:
Email to: Sales@euvis.com
Or call: (805) 583-9888 x108 Sales Department
Or fax: (805) 583-9889

The information contained in this document is based on measured results. Characteristic
data and other specifications are subject to change without notice. Customers are advised
to confirm information in this advanced datasheet prior to using this information or
placing the order.
Euvis Inc. does not assume any liability arising from the application or use of any
product or circuit described herein, neither does it convey any license under its patents or
any other rights.

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