Hardware implementation

1
Hardware implementation

• DSP ADSP-2181, 16 bit, fixed point, 40MHz
• D/A 300kHz, 14 bit
• PC development environment LabVIEW

2
Solutions using fixed-point arithmetic

Need to optimise the coefficients of the filters
to exploit the available numerical range

• Limited precision
• Saturation

3
Algorithm
Interrupt
Random number
Filters
D/A conversion
Return
4
Features

• Flexible 1/f a noise generator
• Digital noise generation (DSP)
• Analog output (D/A conversion)
• Stand-alone or host computer controlled
• High accuracy
• Easy upgrade in speed, accuracy