Arbitrary Waveform Generator Diagram

A function generator with the ability to generate arbitrary waveforms is the b k 4078 as shown in the picture below.

Arbitrary waveform generator diagram.

The basic architecture of this unit employs a field programmable gate array fpga and a high speed and high. The basic block diagram of the dds based arbitrary waveform generator is shown below. The current design will accommodate two waveform generators on a single unit for dual frequency operation. Variable clock arbitrary waveform generator the variable clock arbitrary function generator is the more flexible form of arbitrary waveform generator.

These arbitrary waveform generators are generally more flexible although they do have some limitations not possessed by the dds versions. Here is the dac portion of my arbitrary waveform generator. In this model the two channels share a 4 10 5 byte memory for defining the arbitrary waveforms. Dac sleep is driven directly by a microcontroller gpio.

A dds function generator is a digital arbitrary waveform generator meaning it uses a digital to analog converter dac to build a signal. Otherwise it will be rotated by a fixed angle. Diagram taken from the datasheet. The hdawg arbitrary waveform generator is capable of producing various digital modulation patterns such as qam ask and psk.

This guarantees that the constellation diagram is a square with edges parallel to the horizontal and vertical axes. I have 4 7 µf and 0 1 µf decoupling caps for each power ground pair. These waveforms can be either repetitive or single shot once only in which case some kind of triggering source is required internal or external. A digital representation of a waveform is loaded into awg memory through a variety of software applications such as matlab labview visual studio plus ivi and scpi.

This is a generator with two independent output channels which is a nice feature for stimulating two systems simultaneously. The resulting waveforms can be injected into a device under test and analyzed as. The word arbitrary denotes a user s ability to create waveforms beyond the permanent contents of the instrument s internal memory. It also has read only memory rom where it stores amplitude values for specific waveforms at various time intervals based on a sampling frequency fs.

A common awg block diagram a closer look at each arbitrary waveform generator awg functional block 1. Signal generators are subdivided into categories that include arbitrary function generators afgs and arbitrary waveform generators awgs. The memory is clocked at the highest sampling rate supported by. Abstract we are developing an arbitrary waveform generator awg to provide enhanced capability for radar applications.