Input Parameters
Results
-- dBFS
-- dBFS/Hz
-- bits
Nyquist Frequency: 100 MHz
SNR vs Frequency Plot
Total SNR
Jitter-Limited SNR
Low Freq SNR
The plot shows how the SNR varies with frequency:
- Total SNR (blue): Combined SNR including jitter and other noise sources
- Jitter-Limited SNR (red): SNR contribution from jitter alone
- Low Freq SNR (green): SNR at low frequencies (thermal noise, quantization noise, etc.)
Equations Used:
- Jitter-limited SNR (dBFS): -20*log10(2*π*f*tj) - amplitude_dBFS
- Total SNR (dBFS): -10*log10(10^(-SNR_low/10) + 10^(-SNR_jitter/10))
- NSD (dBFS/Hz): -(SNR + 10*log10(fs*1e6/2))
- ENOB (bits): (SNR - 1.76) / 6.02
Notes:
- f is in Hz (MHz × 10^6) and tj is in seconds (ps × 10^-12)
- SNR values are in dBFS (referenced to full scale)
- The plot spans from 0.1 MHz to the Nyquist frequency (fs/2)
- At high frequencies, jitter typically dominates the SNR performance
- For example, with fs = 200 MHz and SNR = 80 dBFS, NSD should be -160 dBFS/Hz
