Analog voltage memory device

Details Analog voltage memory device Analog voltage memory device

1976-10-13

1978-01-10

Heyman, John S.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307229, 307238, 307246, 328151, G11C 2702

Patent

active

040681360

ABSTRACT:
Disclosed is an analog voltage memory device comprising a differential amplifier for deriving the difference between two analog inputs, an operational amplifier to which are applied the output of the differential amplifier and the source follower voltage of a MOS type field-effect transistor, switching means interconnected to the output terminal of the operational amplifier and the gate of the field-effect transistor, an output resistor interconnected between the source of the field-effect transistor and a negative power source or ground, and a nonpolarized capacitor interconnected between the gate of the field-effect transistor and a negative power source or ground, whereby the output voltage from the differential amplifier may be derived as the output voltage which is the source follower voltage of the field-effect transistor and is held. The analog voltage memory device may derive and hold the difference between two arbitrary analog inputs for a long time in a very simple manner and therefore has a dual function as an adder or subtractor and as an analog memory and finds very useful and wide applications in the fields of measuring instruments and medical appliances.

REFERENCES:
patent: 3701909 (1972-10-01), Holmes et al.
patent: 3927374 (1975-12-01), Nakaya
patent: 3996480 (1976-12-01), Hentschel

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