Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1995-03-14
1997-09-23
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327538, 327539, 323313, G05F 110
Patent
active
056709072
ABSTRACT:
An embodiment of a pumped substrate system includes an oscillator, capacitive pump, comparing circuit, and a level shifter. The level shifter is coupled between the substrate and the positive input lead of the comparator and shifts the voltage level present on the substrate by a voltage Vbg. The comparator compares ground potential to the shifted substrate voltage. The oscillator, capacitive pump and comparing circuit form a negative feedback loop which operates to maintain the substrate voltage substantially equal to -Vbg. In one embodiment, the level shifter includes a band gap reference.
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Analysis and Design of Analog Integrated Circuits, 2d. Ed., Paul R. Gray et al., (1977, 1984), pp. 289-296, 736-737.
Gorecki James
Lall Ravindar
Lefferts Robert B.
Callahan Timothy P.
Kim Jung Ho
Lattice Semiconductor Corporation
Terrile Stephen A.
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