Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1996-04-26
1998-05-26
Cunningham, Terry
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327540, 327545, 323315, 323316, G05F 110
Patent
active
057572240
ABSTRACT:
The present invention is directed toward a circuit for receiving an input current and for producing an output voltage proportional to the input current. The circuit includes a first transistor which receives the input current, and a second transistor connected to the first transistor, wherein the first and second transistors comprise a current mirror topology. A third transistor is connected in series with the first transistor, and an operational amplifier has an output which is connected to the base of the third transistor. The third transistor has a collector coupled to a base junction of the current mirror. The operational amplifier has a positive input terminal coupled to a collector of the second transistor through a first resistor, and a negative input terminal coupled to an emitter of the third transistor through a second resistor, the first and second resistors having substantially similar impedance values.
REFERENCES:
patent: 4317054 (1982-02-01), Caruso et al.
patent: 4570115 (1986-02-01), Misawa et al.
patent: 4703249 (1987-10-01), De La Plaza et al.
patent: 4897595 (1990-01-01), Holle
patent: 4912347 (1990-03-01), Morris
patent: 4990845 (1991-02-01), Gord
patent: 5619163 (1997-04-01), Koo
Antone James A.
Mann Brian W.
Caterpillar Inc.
Cunningham Terry
Donato, Jr. Mario J.
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