Capacitive electromagnetic flowmeter

Details Capacitive electromagnetic flowmeter Capacitive electromagnetic flowmeter

2011-05-31

2011-05-31

Patel, Harshad (Department: 2855)

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

C324S658000, C702S045000

Reexamination Certificate

active

07950292

ABSTRACT:
In a constant current circuit, a constant current is caused to flow through a resistor, thereby causing a constant voltage to occur across the resistor. This constant voltage is then superimposed on an output signal of an operational amplifier that is to be fed back to the drain of a field effect transistor, thereby maintaining the same potential in an AC manner between the output terminal of the operational amplifier and the drain of the field effect transistor. In this way, the gate and drain of the field effect transistor is caused to exhibit the same potential in an AC manner, so that no current will occur through the stray capacitance between the gate and drain of the field effect transistor. As a result, similarly to a case of using a feedback capacitor, the input impedance of the field effect transistor can be raised.

REFERENCES:
patent: 2007/0283766 (2007-12-01), Ishikawa
patent: 2010/0060298 (2010-03-01), Harada et al.
patent: 05-069631 (1993-09-01), None
patent: 05-231890 (1993-09-01), None
patent: 06-241856 (1994-09-01), None
“Selected Analog Circuits”, p. 30; Tamotsu Inaba; CQ Publishers; Jan. 10, 1989 (translation of page into English appended).

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