Multiplexed Amplifier-per-Channel Function Card Overview

Multiplexed amplifier-per-channel systems have a dedicated pre-amplifier for every channel and a single Analog to Digital Converter, ADC, for the system. Amplified and filtered analog signals are multiplexed to a post-amplifier and then presented to the ADC to be digitized. Significant benefits of the multiplexed amplifier-per-channel system are:

Higher Throughput Rates
Since the inputs to the multiplexer have been amplified, less gain is required of the post-amplifier. This enables the multiplexer to operate at higher rates with less noise and higher accuracy.

Improved Filtering
Active Multi-pole filters with programmable cutoff frequencies can be implemented with the amplifier-per-channel systems.

Higher Per Channel Sampling Rate
Channel revisit limitations associated with low-level multiplexed systems equipped with input filters are removed with the amplifier-per-channel systems.

Sensor Isolation
With low-level multiplexed systems, sensor impedance works in conjunction with the resistance of the input passive filter to alter cutoff frequency. With the amplifier-per-channel systems this effect is eliminated.

Improved Channel-To-Channel Isolation
All multiplexer inputs are buffered from each other by the pre-amplifiers thus eliminating the possibility of a defective channel affecting other channels.