Automatic common mode rejection in an analog measuring system

Details Automatic common mode rejection in an analog measuring system Automatic common mode rejection in an analog measuring system

1977-10-17

1979-04-17

Smith, Jerry

Boots, shoes, and leggings

733624, 340347CC, H03K 1302

Patent

active

041504330

ABSTRACT:
An analog measuring system is disclosed which simultaneously stores in a first memory element a voltage generated by a physical phenomenon including the errors introduced by the measuring system and in a second memory element a voltage corresponding to the errors introduced by the measuring system. Subsequently, the voltages are combined so that true electrical representation of the physical phenomenon is provided. Additional means are disclosed which establish a reference for the physical phenomenon. The electrical representation of the reference is combined with the electrical representation of the sensed physical phenomenon to provide an absolute reading. Thus, the measuring system provides an electrical representation of the physical phenomenon which is independent of time, temperature and frequency.

REFERENCES:
patent: 3641563 (1972-02-01), Cushman et al.
patent: 3781869 (1973-12-01), Sudnick et al.
patent: 3903743 (1975-09-01), Noller
patent: 3982241 (1976-09-01), Lipcon
patent: 4020487 (1977-04-01), Winter
patent: 4063447 (1977-12-01), Mathison

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