8.2
FECG Leg Plate
Patient Connections
, these follow the standard three node connection pattern
commonly used in FECG monitoring.
Instrumentation Amplifier
, this is used to amplify the FECG signal. An
instrumentation amplifier is used as it is very important that this stage has a very high
common mode rejection ratio due to the small FECG signal that is presented with
large common mode noise and maternal signals.
Isolation Amplifier
, to maintain patient safety should an electrical fault occur, an
isolation amplifier is used as a barrier to avoid excess leakage through to the patient.
Power Supply
, this is used to provide a 15V supply to the isolation amplifier. A +5V
supply is derived from the +10V input. The +5V supply is used in conjunction with
the -10V line to provide the isolation amplifier with the 15V required.
Signal Conditioning
, is used to smooth and amplify the signal from the Isolation
amplifier for further processing by the main unit.
The unfiltered signal from the isolation amplifier is also provided.
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Issue: 2 Draft
Rev: a
614365
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