Patent ID: 6590420
Filing Date: 2003-07-08
Classification: H03K

Abstract:
A circuit for shifting a signal from a first voltage level referenced to a first voltage reference, to a second voltage level referenced to a second voltage reference, the circuit comprising:a first switch receiving the signal, the first switch having an output; a second switch receiving an inverted representation of the signal, the second switch having an output; a third switch receiving the output of the first switch, the third switch having an output; a fourth switch receiving the output of the second switch, the fourth switch having an output; a fifth switch referenced to the second voltage reference, the fifth switch having an input coupled with the output of the first switch, the fifth switch having a control coupled with the output of the fourth switch; and a sixth switch referenced to the second voltage reference, the sixth switch having an input coupled with the output of the second switch, sixth switch having a control coupled with the output of the third switch; wherein when the third switch and the fourth switch are on, the signal is shifted to the second voltage level measured between the input of the fifth switch and the second voltage reference.