Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1994-03-30
1995-01-03
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327 78, 327546, H03K 1722
Patent
active
053789369
ABSTRACT:
A power supply voltage level detecting circuit includes a reference voltage generating circuit for generating a constant reference voltage independent of a power supply voltage, a to-be-compared voltage generating circuit for generating a voltage to be compared changing dependent upon the power supply voltage, a current mirror type differentially amplifying circuit for amplifying differentially the reference voltage and the voltage to be compared, and a determining circuit for generating a level detecting signal indicating whether or not the power supply voltage has attained a predetermined level in accordance with an output of the differentially amplifying circuit. The to-be-compared voltage generating circuit generates the voltage to be compared by dropping the power supply voltage using the resistance division or the forward voltage drop of diode. Since a signal corresponding to the power supply voltage level is provided from the differentially amplifying circuit, it is possible to detect the power supply voltage level reliably without being affected by variation of an input logic threshold voltage of an inverter circuit due to the manufacturing process.
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Blue et al., IBM Tech. Discl. Bultn., "Automatic Restart for Microprocessors", Mar. 1984, pp. 5319-5320.
IBM Tech. Discl. Bultn., "Restart Circuit for Microprocessors", Apr. 1986, pp. 4815-4816.
Ikeda Kazuya
Kokubo Nobuyuki
Callahan Timothy P.
Cunningham Terry D.
Mitsubishi Denki & Kabushiki Kaisha
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