Hardware implementation
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Hardware implementation RS 232 D SP D/A U serinterface 1/f α noise PC • DSP: ADSP-2181, 16 bit, fixed point, 40MH • D/A: 300kHz, 14 bit • PC: development environment: LabVIEW
description
Hardware implementation. DSP: ADSP-2181, 16 bit, fixed point, 40MHz D/A: 300kHz, 14 bit PC: development environment: LabVIEW. Solutions using fixed - point arithmetic. }. Need to optimise the coefficients of the filters to exploit the available numerical range. Limited precision - PowerPoint PPT Presentation
Transcript of Hardware implementation
Hardware implementation
RS 232 DSP D/A
User interface
1/f α
noise
PC
• DSP: ADSP-2181, 16 bit, fixed point, 40MHz• D/A: 300kHz, 14 bit• PC: development environment: LabVIEW
Solutions using fixed-point arithmetic
Whitenoise
Ab1, f1
Ab2, f3
Ab3, f3
.
.
.
+
∙ A1/Ab1
∙ A1/Ab1
∙ A1/Ab1
.
.
.
1/f α
noise
•Limited precision
•Saturation
}Need to optimise the coefficients of the filters to exploit the available numerical range
Algorithm
Interrupt
Random number
Filters
D/A conversion
Return
mcxax nn mod)(1
niininini yCxDxDy ,11, 001
i
nin yY 1,1
Features
• Flexible 1/f α noise generator
• Digital noise generation (DSP)
• Analog output (D/A conversion)
• Stand-alone or host computer controlled
• High accuracy
• Easy upgrade in speed, accuracy
