Ultra low noise characteristics are required for the
preamplifier employed in MEG. In addition, MEG is usually
composed of multi-channel configuration. A differential
amplifier is used for signal crosstalk countermeasure and would
degrade noise characteristics. We designed our preamplifier in
MEG to meet these requirements.
MEG using the SQUID Sensor (highly sensitive magnetic
sensor)
Technological strengths
 |
FLL (Flux
Locked Loop)
|
|
|
|
A drive circuit that detects and controls micro signal from
SQUID (superconducting quantum interference device) with high
resolution of fT(10-15) by 16 channel independent
ultra low noise amplifier.
A high precision analog signal processing circuit which extracts
information for signal analysis
A circuit that cancels the magnetic field
from the external environment which generates noise. The circuit
realizes highly accurate measurement.
A drive circuit with advanced measures to
EMI, A structure with high electromagnetic shielding, a
dedicated analog power supply for EMI countermeasures.
Ultra low noise characteristics are required for a preamplifier
employed in MRI. In addition, the preamplifier should use parts that
do not contain a magnetic material so that it properly operates in a
strong magnetic field, and resume normal operation right after
saturated with a large signal.
Our preamp satisfies these requirements.
Bias stabilizing
circuit
Active input
impedance
Ultra Low
Noise
(Lower than the thermal noise of
resistance）
Noise Figure: 0.8 dB (15 MHz to 63
MHz)
0.9
dB (83 MHz)
Wideband: 100 MHz
Gain：44dB
Overload Recovery
Time: 100 μs
Dimensions: 50(L) x
40(W) x 10.3(H)mm
