GW Instek SFG-830 User Manual - Manual (Page 8)

SFG-830 p.5
A DDS frequency synthesizer consists of a phase accumulator, a lookout table (ROM
or RAM), a Digital-to-Analog Converter (DAC), and a Lowpass Filter (LPF). The
amount in a phase accumulator is controlled by the frequency control word (K), which
will be added by 1 after each system clock cycle(=1/fs). The output of the accumulator
is used to position the data in the Table ROM (or RAM). The digital data will then be
converted into a smooth analog waveform after passing through the DAC and LPF.
3. Features
SFG-830 is a functional signal generator that applies DDS (Direct Digital Synthesis)
technique and can generate frequencies at a resolution of 20mHz, with a high
frequency accuracy of 10ppm. Its main signal source can generate waveforms of sine
wave, square wave, triangle wave, ramp wave, and arbitrary wave.
— The output frequency range and resolution of each waveform are:
Waveforms Frequency Range Resolution
Sine wave, square wave 20mHz ~ 30MHz 20mHz
Triangle wave, ramp wave 100mHz ~ 100kHz 10mHz
Arbitrary wave 42.949600MHz/N, where N=8,10,12,…,2 15
— The depth of AM modulation : 0% ~ 100%
— Sweep range : 10mHz ~ 1kHz
— With FM and PSK modulation functions, and the users can choose the modulation
signal source among sine wave, square wave, triangle wave, ramp wave, and
arbitrary wave with modulation frequency up to 10kHz.
— The digital modulation and sweep functions provide you a stable and high-
resolution (10mHz) modulation environment.
— SFG-830 has complete environment of computer interface, including standard
RS232 and optional GPIB, to fulfill your requirement of automatic test and control.
— The arbitrary waveform function offers 12000 ×12bits data length for free compiling.
The user can compile not only with keys on the front panel, but also through a
compiling software “Arbitrary Waveform Composer Software for Windows”
(optional).