Circuit for generating a substrate bias

Details Circuit for generating a substrate bias Circuit for generating a substrate bias

G - Physics

05

F

328/198

G05F 3/20 (2006.01)

Patent

CA 1232953

PHN 11.140 8 03-04-1985 ABSTRACT: " Circuit for generating a substrate bias.". A substrate bias generator in which the junction point of the capacitance and the diode of the charge pump is connected to the earth point of the circuit (and of the further circuit on the substrate for which the bias is generated) via two or more series-connected tra- nsistors. During the charging period of the capacitance the transistors are (fully) conductive, hence the capacitance is optimally charged as the conductive transistors cause no (or hardly any) voltage drop During the pumping cycle all transistors are diode-connected, bringing about a negative voltage with respect to the earth point at the junction point, which negative voltage is limited by the sum of the threshold voltages of the diode-connected transistors.

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