Acquisition Amplifier

Full Bandwidth, High Definition Signals
from 512 Macro and Microelectrodes

User Example:
Long-term DC Recording
ATLAS Amplifier with 16 ATLAS Combo Boards / 512 Channels


High Definition: 40 kHz sampling frequency per channel
High Density: 512 Channels
High Fidelity: 24 bit, 19 bits linear, A/D converters


The "workhorse" of the ATLAS Neurophysiology System, the ATLAS Acquisition Amplifier is capable of recording multi-scale signals of differing amplitudes at high sampling rates. Extensive channel referencing options enhance human microwire recording results. The foundation of the ATLAS Acquisition Amplifier is the ATLAS Combo Board, performing both analog-to-digital signal conversion and digitally controlled reference selection.

Dual research and clinical recording streams of macro and microwire signals may be acquired with different sampling rates and filter settings. All channels are available for each stream through the Pegasus software.

The ATLAS Acquisition Amplifier contains the most flexible channel reference selection capabilities with up to 8 references selectable for each 32 channel bank and 7 signals globally shared across the system. This allows each microwire bundle to be referenced to a close macro or quiet microwire electrode. All reference selections are software-controlled, eliminating the need to change reference connections inside the patient headwrap. References can also be changed "on the fly" to optimize microwire recordings.

The DC response (+/-1 V) allows accurate recording during and after stimulus delivery - with zero recovery time needed even when inputs are saturated. This allows investigation of EEG after discharge signals. Very slow, long-term DC electrode potential shifts may also be recorded. The large DC input range avoids saturation for various electrode types.

Sub-microvolt resolution over the large +/-132 mV AC input range provides optimal signal resolution even in the presence of large artifacts without clipping.

Channels512Increased Coverage
Analog to Digital24 bitSub-microvolt Resolution
Precision/Accuracy19 bits linearVery Low Distortion
AC Input Range-132 mV to 132 mVRecord the Entire Signal
DC Input Range-1 V to 1VPre-Ictal Shifts Recorded
Common-mode Rejection110 dB Input Board direct
90 dB with DRS
Programmable Reference
Clean Signals
Sample Rate Maximum40 kHzBetter Analysis of HFO's
Noise Level1.3 µV rms Signal to Noise Increased
System Configuration• Stand-alone Operations
• Operations with Clinical EEG
• NetCom Operation
System Flexibility