New Instek SFG-2104 4 Mhz DDS Function Generator
Instek SFG-2104 4 MHz DDS Function Generator
with two year warranty
Includes built in Frequency Counter, Sweep and AM-FM Modulation
The SFG-2104 series are Synthesized Function Generators which apply Direct Digital Synthesis (DDS) technique and can generate and stable frequencies with high resolution. The main signal source can generate waveforms including Sine wave, Square wave and Triangle wave.
- DDS Technology and FPGA Chip Design
- Frequency Range:0.1Hz~4MHz
- High Frequency Accuracy : ± 20ppm
- High Frequency Stability : ± 20ppm
- Frequency Resolution :100mHz
- Low Distortion Sine Wave:-55dBc,0.1Hz~200kHz
- Front Panel Setting Save/Recall with 10 Groups of Setting Memories
- Build-in 6 Digits 150MHz/High Resolution Counter
- INT/EXT AM/FM Modulation
- LIN/LOG Sweep Mode
The SFG-2000/2100 Series Synthesized Function Generator apply Direct Digital Synthesis (DDS), a new technique of frequency synthesis that generates a stable output frequency with extraordinary resolution. The innovative design of the SFG-2000/2100 Series is exempted from the problems occurred on the traditional function generators:
The typical integrating circuit and constant current source circuit technique is easily affected by the operation temperature, since the change of the temperature will change the value of resistors, capacitors and the other components, that will certainly cause change on the frequency. So the analog type of function generator has poor characteristics like stability and accuracy.
The traditional frequency synthesized function generators typically use Phase Locked Loop (PLL) techniques to generate waveform demanding much higher resolution (up to 1:106 in general) and stable reference frequency, when the PLL system is running, the problem of phase jitter and frequency switching response may occur due to the dynamic loop filter is in use. c) The PLL system needs a wave-shaping circuit with an address counter that is controlled by a variable frequency clock. The counter addresses memory locations in a waveform RAM, and the RAM output is converted into an analog output signal by a high-speed digital-to-analog converter (DAC) and followed a low pass filter.
DDS Function Generator generates analog waveform by the waveform RAM, high speed DAC and low pass filter, but it can avoid the problems occurred on the PLL due to the fixed frequency clock (fs) in use. Besides, the resolution of DDS is higher than that of PLL's. DDS's resolution is fs/2k where K is the control frequency word, which is more than 28 bits in general. Therefore, the DDS frequency resolution can be much better than the other types