The model 4045B is a high-performance 20 MHz DDS (direct digital synthesis) function generator with arbitrary waveform capability. Generating stable and precise sine, square, triangle, and arbitrary waveforms, this instrument provides variable output voltages from 0 to 10 Vpp into 50 Ω (up to 20 Vpp into open circuit), linear and logarithmic sweep, AM/FM modulation, a built-in counter, and a continuously variable DC offset that allows the output to be injected directly into circuits at the correct bias level. Separate output amplitude and DC offset amplifiers let you set a large DC offset (e.g. ± 4.99 V ) with a small amplitude output signal (e.g. 10 mV), a feature typically found in more expensive generators.
The 4045B combines a traditional DDS and a true arbitrary generator in one unit, giving users the benefits of both technologies. Using DDS technology, waveforms can be generated with high frequency resolution at a low price. Due to the inherent limitations of this architecture, not all points from the waveform memory are used, and points may be skipped at higher frequencies. This leads to significantly more jitter and higher distortions on non-repetitive waveforms and sometimes small details of the waveforms stored internally will be missing from the output signal. The true arbitrary waveform section generates point by point waveforms with lower jitter, high resolution, and true representation of the required waveform.
Due to the arbitrary waveform capability of the 4045B, the instrument is able to generate low-jitter square waves with greater edge stability. The improved signal integrity allows these generators to be used for simulating reliable clock signals, generating triggers, or validating serial data buses.
This model is suitable for education and other applications that require DDS function generators with sweep, modulation, and arbitrary waveform capabilities.
Front panel