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Arbitrary Waveform Generator

Instrumentation & Measurement Solutions -
Arbitrary Waveform Generator

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Function/Arbitrary waveform generators can generate periodic waveforms (including sine, square, triangle, sawtooth and pulse waveforms) and irregular waveforms (e.g. noise waveforms). They are widely used in designing, testing and troubleshooting an electrical device. A typical function/arbitrary waveform generator is made up of human-machine interface, signal generation and processing circuits, and power supply.

The major feature of a function/arbitrary waveform generators is its capability of generating different waveforms. That can be achieved by the signal generation circuit. It can produce waveform data by using either a dedicated DDS device or a combination of FPGA (implementing DDS algorithm) and high-speed DAC. Generating signals by DDS device brings high-frequency and high-quality waveforms, as well as simple design, but lacks flexibility because only standard waveforms can be generated, whereas the combination of FPGA and DAC is capable of producing user-defined arbitrary waveforms apart from the standard ones. The solution shown here is built on FPGA and DAC. After signals output from the generation circuit, the signal processing circuit will implement filtering and amplification. Moreover, both circuits can work on external inputs such as trigger inputs, amplitude modulation inputs and clock inputs, and provide synchronous outputs as well.

A waveform generator needs a user interface to display setting parameters and graphical waves, and provides user controls. The user interface consists of a MCU, a keypad and knobs, a LCD display, and different communication interfaces. As the core device of human-machine interface, the MCU is used to process the inputs from the keypad, knobs or other interfaces to indicate the required waveforms, frequencies and amplitudes, and also show these parameters on the LCD display.

Function/Arbitrary waveform generators are high-precision devices, and therefore require high-quality power supply to ensure proper operations. Typically ultra low-noise LDOs are selected as the power supply for signal generation and processing, and clock management circuits in order to improve the quality of output signals.

 

 

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APPLICATION NOTES

 

ANALOG DEVICES DACChoosing DACs for Direct Digital Synthesis AN-237Click Here
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WHITE PAPERS

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EVAL KITS

ANALOG DEVICES DDSEvaluation Board for 1 GSPS DDS with 14-Bit DACAD9910/PCBZAD9910/PCBZAD9910/PCBZAD9910/PCBZClick Here
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ALTERA FPGACyclone II FPGA Starter Development KitDK-CYCII-2C20NDK-CYCII-2C20NEP2C20F484C7NClick Here
ALTERA FPGACyclone III FPGA Starter Development KitDK-DEV-3C120NDK-DEV-3C120NEP3C120F780C8NEP3C120F780C8NClick Here
ALTERA FPGACyclone III FPGA Starter KitDK-START-3C25NDK-START-3C25N  EP3C25F324C8NEP3C25F324C8N

 

TRAINING

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TEXAS INSTRUMENTS ClockClocking the Signal Path: Part 2Click Here
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TEXAS INSTRUMENTS ClockThermal Considerations for TI Analog Products: Part 1 (of 4)Click Here
TEXAS INSTRUMENTS ClockThermal Considerations for TI Analog Products: Part 2 (of 4)Click Here
TEXAS INSTRUMENTS ClockThermal Considerations for TI Analog Products: Part 3 (of 4)Click Here
TEXAS INSTRUMENTS ClockThermal Considerations for TI Analog Products: Part 4 (of 4)Click Here
NATIONAL SEMICONDUCTOR PowerWEBENCHRegistered FPGA Power Architect Tool Overview – FPGA Power Supply Design in MinutesClick Here
NATIONAL SEMICONDUCTOR PowerWEBENCHRegistered FPGA Power Architect WebinarClick Here
NATIONAL SEMICONDUCTOR ClockClock Design Tool - Loop Filter DesignClick Here
NATIONAL SEMICONDUCTOR ClockClock Design Tool - Getting StartedClick Here
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