參數(shù)資料
型號: TS83102G0BMGS
廠商: ATMEL CORP
元件分類: ADC
英文描述: 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CBGA152
封裝: HERMATIC, CI-CGA-152
文件頁數(shù): 21/52頁
文件大?。?/td> 1548K
代理商: TS83102G0BMGS
28
5360A–BDC–06/05
TS83102G0BMGS
6.3
Considerations on ENOB: Linearity and Noise Contribution
Figure 6-26. Example of a 16-kpoint FFT Computation at Fs = 1.4 Gsps, Fin = 702 MHz,
-1dBFS, T
J = 80°C; Bin Spacing = (Fs/2) / 16384 = 2.67 kHz
This is a 16384 points FFT. It is 16 times decimated since a DEMUX 1:8 is used to relax the
acquisition system data rate, and data is captured on the rising edge of the data ready signal.
The spectrum is computed over the first Nyquist zone from DC to Fs/2.
Legend:
1.
Ideal 10-bit quantization noise spectral density, peak value = -84 dB
2.
Average SNR noise floor: 47 dB + 10 log (N
FFTpoint/2) = 86 dB including thermal noise
3.
Average SNR noise floor: 57 dB + 10 log (N
FFTpoint/2) = 96 dB without thermal noise
4.
Ideal 10-bit averaged SNR noise floor 6.02 x (N = 10) + 1.76 + 10 log (N
FFTpoint/2) = 101
dB
Note:
The thermal noise floor is expressed in dBm/Hz (at T = 300 K, B = 1 Hz): 10 log
(kTB/1 mW) = -174 dBm/Hz or -139.75 dBm/2.67 kHz. THD is calculated over the 25 first
harmonics.
With ADC input referred thermal noise:
ENOB = 7.8 bits
THD = -55.4 dB (over 25 harmonics)
SFDR = -64 dBc
SNR = 48.8 dB
-140
-120
-100
-80
-60
-40
-20
0
20
0
100
200
300
400
500
600
700
=Fs/2
dBc
MHz
SFDR = -64 dBc
4
3
2
1
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