Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1993-02-12
1994-09-20
Sikes, William L.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, 330135, 330277, H03F 345, H03F 350, H03F 3345, H03K 500
Patent
active
053493044
ABSTRACT:
An operational amplifier input stage has at least two positive input transistors and one negative input transistor for providing more accurate and efficient limiting or rectification in limiter and rectifier circuits. The two positive input transistors are connected in parallel having a common drain connected to one side of a load and the negative input transistor's drain is connected to the other side of the load. The sources of all transistors are connected to a common node which is connected to a constant current source. This arrangement enables simplistic high accuracy limiting and rectifier circuits, having a reduced number of extrinsic components, thereby reducing unwanted speed limitations, to be realized. The operational amplifier input stage is also very useful in low supply circuit applications.
REFERENCES:
patent: 3822408 (1974-07-01), Veranth
patent: 4502013 (1985-02-01), Usui
patent: 4564814 (1986-01-01), Miura et al.
patent: 4709216 (1987-11-01), Davis
patent: 5067045 (1991-11-01), Schweiger
patent: 5089723 (1992-02-01), Davis et al.
patent: 5093634 (1992-03-01), Khoury
patent: 5136258 (1992-08-01), Nicollini et al.
patent: 5142244 (1992-08-01), Glica et al.
patent: 5162735 (1992-11-01), Okamoto
patent: 5162749 (1992-10-01), Kobayashi
J. Millman, "Microelectronics", McGraw-Hill, 1979, pp. 594-595.
C. J. Savant et al., "Electronic Circuit Design", Benjamin/Cummings, pp. 539-554.
"Amplifier Applications Guide", Analog Devices, 1992, pp. x-16-17.
Venugopal et al., "Design Considerations for High-Frequency Continuous-Time Filters and Implementation of an Antialiasing Filter for Digital Video", IEEE Journal of Solid-State Circuits, vol. 25, No. 6, Dec. 1990, pp. 1368-1378.
Abraham Fetsum
Anderson Rodney M.
Bachand Richard A.
Jorgenson Lisa K.
SGS-Thomson Microelectronics Inc.
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