Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Nonlinear amplifying circuit
Patent
1993-05-12
1995-06-06
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Nonlinear amplifying circuit
327563, 327427, 330254, H03F 345, H03G 300
Patent
active
054225930
ABSTRACT:
A current-limiting circuit provides prevention of an oscillation phenomenon resulting from a feedback of the current-limiting signal, which is generated by the output of an operational amplifier, to an input of the operational amplifier via a current-mirror element. Gain adjusting elements are connected between a first input terminal of the operational amplifier and the common control terminal, and between the first input terminal and the current-mirror terminal, respectively. The gain adjusting elements' impedance ratio is used to adjust the feedback gain and thereby prevent the oscillation phenomenon. Furthermore, inputting a selected analog voltage into a second input terminal of the operational amplifier maintains the currents constant at two or more desired levels. In addition, a constant voltage source that can be used even with a low power source voltage, and which is suitable for a current-limiting circuit, is provided by connecting a depletion-type MOSFET and an enhancement-type MOSFET in series.
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patent: 5013934 (1991-05-01), Hobrecht et al.
patent: 5157322 (1992-10-01), Llewellyn
patent: 5159516 (1992-10-01), Fujihira
"Bipolar and MOS Analog Integrated Circuit Design" by A. B. Grebenn, Published by John Wiley Sons, N.Y.; pp. 193-209.
"How Current Sense Technology Improves Power Mosfet Switching Applications" by D. L. Zaremba, Jr.; Electron Mini/Micro Northeast Conf. Rec. 1986, pp. 10/4.1 to 10/4.4.
IBM Technical Disclosure Bulletin, vol. 25, No. 7B, Dec. 1982, pp. 3363 and 3364, D. R. Presley, W. R. Yount, "Constant Current Source for Energizing Active Inductive Loads".
Callahan Timothy P.
Fuji Electric & Co., Ltd.
Nu Ton My-Trang
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