Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Patent
1996-10-24
1998-10-20
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
327108, 327132, 327134, 327374, 327377, 327403, H03K 300
Patent
active
058252185
ABSTRACT:
A voltage ramp generator for a driver circuit is provided to give an output that is highly linear between zero and a maximum voltage has a combination of current sources or generators for charging and discharging a capacitor, with discharging performed by sequencing two different types of current sources. A first current source on the discharge side of the capacitor has transistors in cascode connected current mirrors and takes the capacitor voltage to a low value but not as low as zero. A second current source of a basic or simple current mirror then takes the capacitor voltage substantially to zero. The voltage ramp generator meets the requirements of high performance, integrated, driver circuits, particularly for achieving complete turn-off of a power device such as a DMOS transistor in a high side cascoded transistors goes up to a threshold near the full supply driver. It is optional to have two current sources for charging, also, where a first source with voltage and than a second source, in a basic current mirror, continues charging substantially to the supply voltage.
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Gariboldi, "Motion Control," appearing in Smart ICs, Murari et al., Eds., 1995, Ch. 5, pp. 225-283.
Grebene, Bipolar and MOS Analog Integrated Circuit Designs, 1984, Sec. 4.1 pp. 171-183, and Sec. 6.2, pp. 271-277.
Brambilla Massimiliano
Colli Gianluca
Callahan Timothy P.
Galanthay Theodore E.
Jorgenson Lisa K.
Kim Jung Ho
STMicroelectronics Inc.
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