SFG-2000 / SFG-2100
GW Instek SFG-2000 / SFG-2100 Series Features
- DDS Technique and FPGA Chip Design
- Frequency Range : 0.1Hz~4/10MHz
- High Frequency Accuracy : ± 20ppm
- Frequency Resolution : 100mHz
- Low Distortion Sine Wave : -55dBc,0.1Hz~200kHz
- Front Panel Setting Save/Recall with 10 Groups of Setting Memories
- Built-In 9 Digits,150MHz/High Resolution Counter(SFG-2110 Only)
SFG-2000 / SFG-2100 Description
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 and 10MHz 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.
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.