Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Slope control of leading or trailing edge of rectangular or...
Reexamination Certificate
2006-06-13
2006-06-13
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Slope control of leading or trailing edge of rectangular or...
C327S095000
Reexamination Certificate
active
07061291
ABSTRACT:
Circuitry is provided for controlling the slew rate of a negative output supply. The slew rate control circuitry includes an NMOS FET, a feedback resistor connected across the drain and the gate of the NMOS FET, an input resistor connected to the gate of the NMOS FET, level shifting circuitry connected between a positive output supply voltage and the input resistor, and a bias current source connected to the gate of the NMOS FET. A negative input supply voltage is connected to the source of the NMOS FET, and the negative output supply voltage is provided across a load connected to the drain of the NMOS FET. As the positive supply voltage ramps up from 0 to +VS, the level shifter provides a voltage to the input resistor that ramps up from −VSto 0 volts. Further, the drain voltage of the NMOS FET ramps down from 0 to −VS, thereby providing a negative output supply voltage −VSwith a slew rate that linearly tracks the slew rate of the master positive output supply.
REFERENCES:
patent: 3581226 (1971-05-01), Perkins et al.
patent: 3986132 (1976-10-01), Wittlinger
patent: 4683443 (1987-07-01), Young et al.
patent: 5153469 (1992-10-01), Petted et al.
patent: 6201455 (2001-03-01), Kusunoki
patent: 6597240 (2003-07-01), Walburger et al.
Jacobs Karl H.
Neidorff Robert
Brady III W. James
Callahan Timothy P.
Luu An T.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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