Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – Fusible element actuated
Patent
1995-12-15
1997-04-15
Mullins, James B.
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
Fusible element actuated
330253, 330295, H03F 156, H03F 345
Patent
active
056213743
ABSTRACT:
An amplifying circuit includes a low gain amplifier having positive and negative inputs and an output. A high impedance path provided by, for example, a low gain unity buffer amplifier feeds from the negative input to the output of the amplifier a first voltage (KV.sup.+) equal to a second voltage (V.sup.+) at the positive input of the amplifier multiplied by the reciprocal of the open loop gain (A.sub.OL) of the amplifier. This circuit simulates a unity gain buffer amplifier having a high input impedance and a high open loop gain using a low open loop gain amplifier and a feed forward arrangement. The use of a low gain amplifier avoids the need for large area transistors and the resultant large parasitic capacitances and so facilitates high speed operation.
REFERENCES:
patent: 2852625 (1958-09-01), Nuut
IEEE Journal of Solid State Circuits, SC-14, No. 6, Dec. 1979, pp. 1070-1077.
IEEE Journal of Solid State Circuits, SC-11, No. 6, Dec. 1976, pp. 748-753.
IEEE Journal of Solid State Circuits SC-14, No. 6, Dec. 1979, pp. 1111-1114 .
Franzblau Bernard
Mullins James B.
U.S. Philips Corporation
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