Other Parts Discussed in Thread: ADS1299, , AFE4960
Tool/software:
Hello TI support.
Looking at the noise figures in AFE4960P full datasheet and ADS1299.
- I wonder how noise AFE4960P goes low at higher sample rate(Figure 6-7 .. 6-8), where as it is the opposite in ADS1299 (Table 1 through 4).
- Does the noise figure in AFE4960P include noise from the Bias Amplifier, i.e. inputs are shorted to RLD-pin?
Ref:
SBAA561 – OCTOBER 2022 Application Brief. Wearable Electroencephalography (EEG)
AFE4960 Two-Channel ECG, Respiration and Pace Pulse Detection Analog Front End (AFE) for Clinical Wearables
– Input noise (0.5-150 Hz): 13 µVpp at INA gain of 3; 5 μVpp at INA gain of 12
Table 1. Specifications for a Wearable EEG System: "Low input referred noise 2.7 μVpp 70-Hz bandwidth".
Figure 6-7 plots the input referred noise of the ECG signal chain in 150 Hz bandwidth versus the RAC frequency
(equal to the ECG sampling rate) at different INA gains. The noise in the 150 Hz bandwidth gets lower as the
RAC frequency is increased since the noise gets spread over a wider Nyquist bandwidth.
ADS1299-x Low-Noise, 4-, 6-, 8-Channel, 24-Bit, Analog-to-Digital Converter for EEG and Biopotential Measurements
• Input-Referred Noise: 1 μVPP (70-Hz BW)
PATIENT BIAS AMPLIFIER Integrated noise BW = 150 Hz 2 μVRMS
BR. Peter
