Selection Mode
Driven Right Leg (DRL)
β DRL Devresi
Pasif
DRL
DRL Gain (ADRL)
β
High gain β better CM cancellation (instability risk β)
Geri Besleme Direnci Rfb
β
Rfb Provides current limit β safety
Electrode Impedances
β Ground / DRLGood
5 kΞ©
β‘ ReferansGood
10 kΞ©
π΅ Recording ElectrodeGood
10 kΞ©
Target <5 kΞ© Β· Accept <20 kΞ© Β· Bad >50 kΞ©
Efektif CMRR
β dB
Amp: 100 dB
Zgnd: 0 dB
Mismatch: 0 dB
Konum: 0 dB
0 dB
140 dB
Ready Configurations
Ref: A1
Ground: AFz
DRL: Closed
Pasif:
CMRReff = CMRRamp β 20Β·log(Zgnd) β ΞZmismatch
DRL:
CMRRDRL = CMRRpasif + 20Β·log(1 + ADRL)
Vbody = β(Rfb/Ravg) Β· VCM
β DRL Circuit Diagram
EEG Channels
Ξ± 10Hz Β· Ξ² 20Hz Β· ΞΈ 6Hz Β· Mu 11Hz Β |Β Observe active cancellation of 50 Hz noise even at high impedance with DRL on