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US 5,498,991 AGranted
Level shifter circuit
AssigneeOki Electric Industry Co., Ltd.
InventorSatoru Tanoi
Life of this patent
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Abstract
A level shifter includes an N-channel enhancement-mode field effect transistor (40), a P-channel depletion-mode field effect transistor (38), and a current mirror (42) coupled to the source of the enhancement-mode transistor and the drain of the depletion-mode transistor; wherein the gates of the transistors are coupled to an input terminal and the source of the enhancement-mode FET is coupled to an output terminal to provide a level shifted output signal.
Claims3
A level shifter, comprising:
- an input terminal;
- an output terminal;
- a depletion-mode field-effect transistor of a first channel type with a source coupled to receive a first fixed potential, a gate coupled to said input terminal, and a drain;
- an enhancement-mode field-effect transistor of a second channel type with a source coupled to said output terminal, a gate coupled to said input terminal, and a drain coupled to receive said first fixed potential;
- and
- a current mirror coupled to allow a current flow between the source of said enhancement-mode field-effect transistor and a second fixed potential, responsive to a current flow between the drain of said depletion-mode field-effect transistor and said second fixed potential.
3 more elements
Dependencies are inferred from the claim text.