| 摘要 |
One hundred low frequency analog signal channels having a very large dynamic range may be amplified to at least half of full scale of a 14-bit analog to digital converter without distortion by an amplifier system that includes a preamplifier for each channel, a filter system for each channel, a gain-ranging multiplexer time-shared between 10 channels, and a second multiplexer that time shares the output of the gain-ranging multiplexers with an instantaneous gain-ranging amplifier. The gain-ranging multiplexer performs part of the multiplexing function and supplies sufficient gain ahead of the second multiplexer, a high speed, higher noise level multiplexer to mask the noise introduced into the system thereby. The output of the system is typically digitized.
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