Based
on the Direct Digital Synthesized (DDS) technology and unique FPGA
design, the SFG-2000/2100 Series Function Generators are built
with exceptionally high performance far exceeding that of any
conventional function generators at a very competitive price. Stable
output frequency, low distortion, and fine frequency resolution
are the most remarkable characteristics of this product series.
The SFG-2000/2100 Series include four members in each family at 4MHz,
7MHz, 10MHz and 20MHz bandwidth(perivd), The SFG-2100 Series have
additional functions of Sweep, AM/FM modulation, and External
Counter. As a result of the 20ppm stability level and output
waveform accuracy, The SFG-2000/2100 Series well fit into a wide
variety of applications, such as signal generator for experiment
labs, reference signal for PLL (Phase Locked Loop), and calibration
and adjustment source for electronic devices.
OUTPUT WAVEFORM
The
SFG-2000/2100 Series provide Sine, Triangle and Square waveforms
with DC offset and variable duty cycle at 20ppm frequency stability
and accuracy. The low drift rate and -55dBc low sine wave
distortion output significantly extend product application range in
various market sectors.
The TTL/CMOS output is also
available to fulfill various requirements. In addition to the basic
functions, The SFG-2100 Series provide advanced functions such as
AM/FM modulation, sweep mode, and Built-In Frequency Counter.
DDS FG VS. CONVENTIONAL FG
The
SFG-2000/2100 Series generates signals by continuously delivering a
series of sampling values from a sine waveform table (stored in
RAM) to DAC (Digital to Analog Converter) for waveform construction.
With a low pass filter circuit to filter out the harmonics of the
DAC output and smooth the signal, the SFG-2000/2100 Series is able
to provide a stable output with very low waveform distortion. This
is very different from the way a conventional FG generates a
signal. Since a conventional FG needs to obtain its signal by
switching current sources between positive and negative directions
all the time, the "Ringing" distortion occurs at the peak of the
signal waveform where the switching is activated. This distortion is
especially serious when the output amplitude is low. For the
SFG-2000/2100 DDS FG, however, the waveform distortion remains low
even when the output amplitude is at only 2mVpp.
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