Transformerless input for seismic data acquisition system

Details Transformerless input for seismic data acquisition system Transformerless input for seismic data acquisition system

1974-12-11

1976-07-27

Moskowitz, Nelson

Communications: electrical

Selective

Having electron beam device

340 3M, 340 155GC, 340 155F, 330 30D, 178 63E, G01V 136, H04B 328

Patent

active

039720209

ABSTRACT:
In a long line data acquisition system, an input network is provided for coupling the lines to a data acquisition unit. The network includes the cascade combination of a first filter presenting a low pass frequency response to common mode voltage and a second filter presenting a low pass frequency response to difference mode voltage. The output of the second filter is coupled to an amplifier having high common mode rejection. The network substantially reduces, at the amplifier input, both common mode and difference mode noise picked up by the lines.

REFERENCES:
patent: 2733412 (1956-01-01), Alexander et al.
patent: 2748202 (1956-05-01), McCallister et al.
patent: 3223920 (1965-12-01), Sasaki
patent: 3535646 (1970-10-01), Quinn
patent: 3705365 (1972-12-01), Szabo et al.
patent: 3778759 (1973-12-01), Carroll

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