Voltage level shifting circuit
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United States of America Patent
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app pub date -
Mar 14, 2002
filing date -
Mar 24, 2000
priority date (Note) -
Abandoned
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Abstract
An integrated level shifter circuit converts an input signal having a first voltage potential to an output signal having a second voltage potential. The level shifter circuit provides circuit operation between the sections when the voltage potential of the input logic signal is converted to the output logic signal having lower voltage potential. For logic signals transmitted between sections of an integrated circuit operating with different supply voltages. The level shift circuit for each input includes two transistors and a voltage divider circuit having two resistors in series. The values of the resistors are selected to yield a desired output voltage at a node between the two resistors. In effect, the resistors lessen the a full 0.9 volt diode drop to yield a level shift which is a fraction of a diode drop. A capacitor in parallel with the resistor provides a path for AC signals and increases both the speed and bandwidth of the level shifter.
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