Struct tone_meas_t¶

Single-tone dynamic-measurement bag. More...

#include <measure_core.h>

Public Attributes¶

Type	Name
double	amp_uncert_db Amplitude-read uncertainty bound (dB).
double	bin_hz FFT bin spacing = fs/nfft (Hz).
double	enbw_hz Equivalent noise bandwidth (Hz) (= rbw_hz).
double	enob ENOB = (SINAD - 1.76)/6.02.
double	enob_fs Full-scale-corrected ENOB.
double	floor_uncert_db Noise-floor standard error (dB).
double	fund_dbfs Fundamental level (dBFS).
double	fund_freq Fundamental frequency (Hz).
size_t	lobe_bins Window main-lobe half-width L (bins).
size_t	n_noise_bins Number of bins counted as noise.
double	noise_floor_dbfs Mean per-bin noise power (dBFS).
double	proc_gain_db FFT processing gain = 10log10(nfft/2) (dB).
double	rbw_hz Resolution bandwidth = enbwfs/n (Hz).*
double	sfdr_dbc SFDR: fundamental - worst spur (dBc).
double	sfdr_dbfs SFDR: full scale - worst spur (dBFS).
double	sinad SINAD = 10log10(fund/(noise+harm)) (dB).
double	snr SNR = 10log10(P_fund / P_noise) (dB).
double	thd THD = 10log10(P_harm / P_fund) (dBc).
double	thd_n THD+N = 10log10((noise+harm)/fund) = -SINAD.
double	thd_pct THD = 100 sqrt(P_harm / P_fund) (%).
double	worst_spur_dbc Worst spur level vs the fundamental (dBc).
double	worst_spur_freq Worst spur frequency (Hz).
int	worst_spur_is_harm 1 if the worst spur is a harmonic, else 0.

Detailed Description¶

All ratios (SNR/SINAD/THD/THD+N) are dimensionless dB and independent of the dBFS reference; the absolute *_dbfs levels reference a full-scale tone to 0 dBFS (real captures: a peak-full_scale sine; complex: a full_scale exponential). Accuracy fields describe the analysis grid that produced them.

Public Attributes Documentation¶

variable amp_uncert_db¶

Amplitude-read uncertainty bound (dB).

double tone_meas_t::amp_uncert_db;

variable bin_hz¶

FFT bin spacing = fs/nfft (Hz).

double tone_meas_t::bin_hz;

variable enbw_hz¶

Equivalent noise bandwidth (Hz) (= rbw_hz).

double tone_meas_t::enbw_hz;

variable enob¶

ENOB = (SINAD - 1.76)/6.02.

double tone_meas_t::enob;

variable enob_fs¶

Full-scale-corrected ENOB.

double tone_meas_t::enob_fs;

variable floor_uncert_db¶

Noise-floor standard error (dB).

double tone_meas_t::floor_uncert_db;

variable fund_dbfs¶

Fundamental level (dBFS).

double tone_meas_t::fund_dbfs;

variable fund_freq¶

Fundamental frequency (Hz).

double tone_meas_t::fund_freq;

variable lobe_bins¶

Window main-lobe half-width L (bins).

size_t tone_meas_t::lobe_bins;

variable n_noise_bins¶

Number of bins counted as noise.

size_t tone_meas_t::n_noise_bins;

variable noise_floor_dbfs¶

Mean per-bin noise power (dBFS).

double tone_meas_t::noise_floor_dbfs;

variable proc_gain_db¶

FFT processing gain = 10log10(nfft/2) (dB).

double tone_meas_t::proc_gain_db;

variable rbw_hz¶

Resolution bandwidth = enbw*fs/n (Hz).

double tone_meas_t::rbw_hz;

variable sfdr_dbc¶

SFDR: fundamental - worst spur (dBc).

double tone_meas_t::sfdr_dbc;

variable sfdr_dbfs¶

SFDR: full scale - worst spur (dBFS).

double tone_meas_t::sfdr_dbfs;

variable sinad¶

SINAD = 10log10(fund/(noise+harm)) (dB).

double tone_meas_t::sinad;

variable snr¶

SNR = 10log10(P_fund / P_noise) (dB).

double tone_meas_t::snr;

variable thd¶

THD = 10log10(P_harm / P_fund) (dBc).

double tone_meas_t::thd;

variable thd_n¶

THD+N = 10log10((noise+harm)/fund) = -SINAD.

double tone_meas_t::thd_n;

variable thd_pct¶

THD = 100 sqrt(P_harm / P_fund) (%).

double tone_meas_t::thd_pct;

variable worst_spur_dbc¶

Worst spur level vs the fundamental (dBc).

double tone_meas_t::worst_spur_dbc;

variable worst_spur_freq¶

Worst spur frequency (Hz).

double tone_meas_t::worst_spur_freq;

variable worst_spur_is_harm¶

1 if the worst spur is a harmonic, else 0.

int tone_meas_t::worst_spur_is_harm;

The documentation for this class was generated from the following file native/inc/measure/measure_core.h