Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Nonlinear amplifying circuit
Patent
1994-05-06
1995-12-12
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Nonlinear amplifying circuit
330252, 330257, G06G 742
Patent
active
054753392
ABSTRACT:
An op amp circuit utilizes an improved current mirror circuit that includes a first transistor connected to a second transistor such that their sources and gates are commonly connected. A resistive element is connected between the drain and the gate of the first transistor such that a current passing through the second transistor is proportionally related to the current passing through the first transistor and the drain to source voltage of the first transistor accurately tracks the drain to source voltage of the second transistor. The resistive element may be a resistor or a third diode connected transistor. Additional transistors may be added in cascode configuration as needed. The op amp includes an input stage for receiving the differential input and for outputing a modified differential output that is proportional to the differential input.
REFERENCES:
patent: 3571694 (1971-03-01), Hunger
patent: 4068182 (1978-01-01), Dingwall et al.
patent: 5327100 (1994-07-01), Stockstad et al.
patent: 5361040 (1994-11-01), Barrett, Jr.
Callahan Timothy P.
National Semiconductor Corporation
Zweizig Jeffrey
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