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Three-Drive Neural Implant System
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The system consists of the following components:
• The microdrive. (see Fig. 1) The
microdrive is
implanted on the animal. It has 3 micromotors. Each motor moves a
shuttle with submicron resolution. The shuttle can carry up to
three metal electrodes (maybe four, depending on electrode diameter).
• A signal buffer and flexible cable. This is attached to the
microdrive
during recording. The signal buffer is the first stage of signal
amplification and processing. The buffer has unity voltage gain.
• A 12-channel differential preamplifier. This is the next stage of
signal amplification.
Each differential amplifier has a voltage gain of 100 and a band pass
from sub Hz to over 20
KHz. Each amplifier scales up the difference between its electrode
signal and one of several references.
• The rotational commutator. The multichannel preamplifier hangs from
the
rotational commutator, so that the cable is allowed to rotate freely
and avoid twisting.
• The preamplifier interface (distribution box). The rotational
commutator is connected by
25-conductor cable to the distribution box. The distribution box routes
12 signal channels to the data acquisition system. It is also has an
option to send four of 12 channels to external amplifiers
for signal visualization or audio monitoring. It also provides the
connections for the amplifier/buffer
power supply and microdrive
motor controller. The microdrive motor controller can be completely
disconnected
from the commutator cable to
prevent noise pick up.
• The microdrive motor controller, supporting 3 motors in the headstage.
• A DC Power Supply. This provides 5 volts to the preamplifier
interface, which in turn provides ±15 volts for the preamplifier
and buffer.
Please see our Specifications page for more details.
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