Programmable TTL and Direct Digital Synthesis
RF Pulse Generator
PulseBlasterDDSTM is a
general-purpose, intelligent, programmable,
RF and TTL/CMOS pulse/pattern generator
system (USB board). The
PulseBlasterDDSTM series of
Intelligent Pulse Generation boards from
SpinCore Technologies, Inc., couples
SpinCore’s unique Intelligent Pulse Timing
Processor core, dubbed PulseBlasterTM,
with Direct Digital Synthesis (DDS)
technology for use in system control and
radio-frequency (RF) pulse generation.
The PulseBlasterTM processor,
implemented in state-of-the-art programmable
logic, provides all the necessary timing
control signals required for overall system
control and pulse synchronization. By
adding DDS features, PulseBlasterDDSTM
can now meet all the excitation/stimuli
needs of demanding users. PulseBlasterDDSTM
provides users the ability to control their
systems through the generation of both
digital control signals and fully
synchronized excitation RF pulses from a
small form factor PC board, providing users
a compelling price/performance proposition
unmatched by any other device on the market
presents the general architecture of the
PulseBlasterDDS-I-300 system. The major
building blocks are the DDS Core and the
Pulse Programming and Timing Processor Core
(PP Core). The DDS Core contains a
Numerically Controlled Oscillator (NCO), 8
programmable phase registers, 1024
programmable frequency registers, the AWG
(Arbitrary Waveform Generator), and the
adjustable attenuator. The PP Core
controls the timing of the gating pulses and
provides the necessary control signals for
frequency and phase registers. The DDS
and PP cores have been integrated onto a
single silicon chip. High performance
DAC chips and high current output amplifiers
complement the design.
Benefits of DDS Technology
Generation of any frequency from DC
(Direct Current) to 1/2 reference clock
oscillator in milliHertz tuning steps (32
bit digital resolution)!
Agile relative phase control using up to
8 programmable phase registers per
channel, 12-bit phase resolution.
Pipeline delay of only 3 reference clock
Agile, phase coherent, "zero-time"
frequency switching using 1024 independent
Greater immunity to parameter drift due
What does SpinCore's
Intelligent Pattern Generation give users?
Timing resolution of 13.3 ns with a 50
MHz external clock (NOTE: Timing
resolution of 2.5 ns is available on
non-DDS, TTL-only PulseBlasterESR boards
operating up to 400 MHz).
4 independent output bits.
Simple instruction set.
Memory space for up to 4k program words
(VLIW, 80-bit wide).
External hardware and software
3.3 V digital TTL/CMOS outputs, 25 mA
per pin. Output bits can be combined
to increase the max. load current.
Small size and low power consumption.
Low level and high level programming
Free technical support; extended support
This exciting product comes with one analog
output channels and 4 TTL/CMOS channels, all
independently controlled and
synchronized. The analog channel
can output RF/IF frequencies down to
programmable DC levels. By providing
multiple options, PulseBlasterDDSTM
can be your complete excitation device for
NMR, NQR, MRI, or related resonance and test
technologies. If more output channels
are required, multiple boards can be
synchronized to provide as many digital
output bits or RF/IF channels as
necessary. The frequency and phase of
the RF pulses generated by the DDS output
channel are under the complete control of
the user and are specified through software
programming. Digital sampling rates of the
output waveforms up to 300 MHz are
External Triggering and
PulseBlasterDDSTM can be
triggered and/or reset externally via
dedicated hardware lines. The two
separate lines combine the convenience of
triggering (e.g., in cardiac gating) with
the safety of the "stop/reset-to-zero"
line. The required control signals are
active low (or short to ground). The
design also allows for multiple boards to be
synchronized, easily extending the available
output pattern to more bits and/or more
RF/IF channels. The "Wait-for-event"
feature is standard.
multi-channel pulse, pattern, and word
generation. Customers’ applications have
Complete high IF digital excitation
system for high field NMR/MRI (just add
Complete bench test equipment for
solid-state NMR probes (just add mixer and
power amplifier!) - eliminates the need
for wasting the precious magnet time.
Build a multi-qubit NMR quantum
computing device at a fraction of the cost
of other solutions.
Use it for all-digital CRAMPS, SFAM, and
other "exotic" solid-state NMR
Build a lock system.
Build a demostration NMR system with/for
Use it for Senior-Project and Masters'
Use with your microcoil probe.
Build and control your own equipment for
"hyphenated" experiments, LC-NMR, etc.
To inquire about the availability and
pricing of our PulseBlaster-DDS line of
products, please use our Contact
pre-programmed RF generator customized for
NMR/MRI decoupling applications. To
simplify the pulse-sequence programming,
WALTZ and MLEV decoupling sequences are
hard-coded via firmware and can be
selected with an external TTL
signal. The RF output frequency and
pulse lengths can be controlled via a
simple ASCII RS232 serial interface.
The RF output power is approx. 10 dBm.
Clock Generator. Single
square-wave output of DDS-derived
frequencies, 32 bits of frequency
precision (141 mHz at 300 MHz reference
oscillator frequency), may be used for
driving digital systems as a digital clock
generator; simplified programming
To complement the power and performance of
the PulseBlasterDDSTM board, the
software programming of the board is
straightforward. The programming
architecture, based on the
Very-Long-Instruction-Word (VLIW) concept,
assures that all RF and DAC events are
always properly synchronized with the timing
control signals generated by PulseBlasterTM
pulse programmer core. The 32k memory
depth and powerful flow control statements
allow the most complicated
patterns/sequences to be executed with
ease. The PulseBlasterDDSTM
board can run under Microsoft Windows
operating systems, including XP. The
control software can be compiled to operate
under other operating systems as well.
This is a demonstration of the simultaneous
frequency and amplitude sweeping
capabilities of the SpinCore Technologies'
PulseBlasterDDS-I-300. The video shows a
chirped pulse with a frequency sweep from 80
to 2 MHz and a Gaussian amplitude profile.