Digital Synthesizer Module
DDS Based Modulated Arbitrary Chirping Transmitter Module - DST501

General Description:

The DST501 module generates modulated arbitrary frequency chirping CW with frequency update rates up to 250 updates/microsecond (1/8 of the DDS clock rate). The on-board SRAM provides 500K 32-bit word data memory. The DST501 can be controlled by a PC or can work alone with pre-stored chirping waveform. The DDS clock input, DDSCK, can be operated up to 2 GHz with minimum power of 0 dBm. The output of the module consists of a single-ended RF output, OUT, which can be operated anywhere from 5 GHz to 6 GHz.

Key Features:


Board Photo:

(DST501 Board Photo)


Detailed Specifications:

GENERAL
DDS Frequency Resolution 32 bits
Frequency Update Rate 1/8 of Input Clock
Waveform Generation Modes Continuous
Triggered Continuous
Triggered Burst / Pulse
User Interface Windows GUI, USB
DDS INPUT CLOCK
Type Single Ended
Termination 50 Ω
Connector Type SMA
Frequency Range Standard: 2 GHz
Optional: 500 MHz to 2 GHz
Power Level 3 to 18 dBm
Return Loss 13 dB
LO INPUT CLOCK
Type Single Ended
Termination 50 Ω
Connector Type SMA
Frequency Range 5.0 to 6.0 GHz
Power Level 0 dBm to 18 dBm
Return Loss 10 dB
OUTPUT
Type Single Ended
Termination 50 Ω
Connector Type SMA
Frequency Range 5.0 to 6.0 GHz
Output Power -3 dBm to 0 dBm
Residual Phase Noise @ 10kHz from Carrier -140 dBc/Hz
Output Return Loss 8 dB
Carrier Suppression 35 dB
Sideband Suppresion 35 dB
WAVEFORMS
Max Waveform Length 522,240 frequency words
Max Number of User Pages 127
Minimum Waveform Length 64 frequency words in Continuous or Triggered Continuous modes
256 ns in Triggered Burst mode
TRIGGER
Connector Type SMA
Source External or Internally Software Generated
External Trigger Threshold Levels
VIL,min: 0 V
VIL,max: 0.8 V

VIH,min: 2.0 V
VIH,max: 3.3 V
MARKER
Number of Markers 1
Marker Length User defined
Minimum Marker Length 4 words
Marker Output Level
VOL,max: 0.4 V
VOH,min: 2.9 V

VOL,typ: 0 V
VOH,typ: 3.3 V
API
Version Euvis API 2.0
CLR Language Support Visual C++
Visual C#
Visual Basic
Visual J#
OPTIONS
Variable DDS Input Clock Frequency Range from 500 MHz to 2 GHz
Pre-Stored Linear Chirp Startup Waveform



Functional Overview:

The DST501 consists of two DDS chips to provide the baseband in-phase and quadrature waveforms. DDS A is the left DDS on the board, while DDS B is the right DDS on the board. DDS A is the in-phase input into the modulator, while DDS B is the quadrature input into the modulator. Both the DDS A and DDS B outputs go through a low-pass filter before entering into the modulator. The user will need to provide the carrier frequency, which can be connected to the board using the LO SMA connector.


Block Diagram



IQ Select
Although the inputs into the modulator are fixed, either DDS chip can be selected as the in-phase or quadrature signal. DDS A (left DDS) is connected to the in-phase input of the modulator, while DDS B (right DDS) is connected to the quadrature input of the modulator. Depending on which DDS chip is selected as the in-phase signal and which is selected as the quadrature signal, the modulated output signal from the modulator can either have the lower sideband suppressed or the upper sideband suppressed.


Modulator Input



If DDS A is selected as the in-phase signal and DDS B is selected as quadrature signal then the lower sideband will be suppressed.


Lower Sideband Suppression



Conversely, if DDS A is selected as quadrature signal and DDS B is selected as the in-phase signal then the upper sideband will be suppressed.


Upper Sideband Suppression



If DDS A and DDS B have the same setting, both are in-phase signals or both are quadrature signals, then neither sideband will be suppressed.


Spectrum Outputs:

Spectrum No Sideband Suppression


Spectrum Upper Sideband Suppression


Spectrum Lower Sideband Suppression Spectrum Lower Sideband Suppression Chirp


Board Diagram:

Board Diagram


Detailed Datasheet:

To get the complete DST501 datasheet, please click here.



Email to: info@euvis.com to get pricing information.

3319 Old Conejo Rd., Newbury Park, CA 91320 | Tel: 805-583-9888 | Fax: 805-583-9889 | info@euvis.com